Gamma-ray Burst 110205A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:03:57 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.589d {+10h 58m 21s} (J2000),
                 164.770d {+10h 59m 05s} (current),
                 163.763d {+10h 55m 03s} (1950)
GRB_DEC:         +67.516d {+67d 30' 58"} (J2000),
                 +67.456d {+67d 27' 23"} (current),
                 +67.784d {+67d 47' 02"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1476 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        15597 TJD;    36 DOY;   11/02/05
GRB_TIME:        7361.36 SOD {02:02:41.36} UT
GRB_PHI:         159.99 [deg]
GRB_THETA:        43.20 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.04 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +0  +0  +0 +58  +0 
SUN_POSTN:       318.37d {+21h 13m 28s}  -16.07d {-16d 04' 00"}
SUN_DIST:        125.85 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.70d {+22h 30m 49s}   -4.28d {-04d 16' 47"}
MOON_DIST:       116.64 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.09, 46.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      128.66, 53.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 317.42,19.58 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:05:51 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.6321d {+10h 58m 31.70s} (J2000),
                 164.8135d {+10h 59m 15.25s} (current),
                 163.8074d {+10h 55m 13.77s} (1950)
GRB_DEC:         +67.5230d {+67d 31' 22.7"} (J2000),
                 +67.4634d {+67d 27' 48.2"} (current),
                 +67.7909d {+67d 47' 27.2"} (1950)
GRB_ERROR:       6.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.40e-08 [erg/cm2/sec]
GRB_SIGNIF:      5.09 [sigma]
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7516.76 SOD {02:05:16.76} UT,   155.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.25 261.45 243.56
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 59"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.72d {+22h 30m 53s}   -4.27d {-04d 16' 24"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.06, 46.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.08 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:05:54 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.6321d {+10h 58m 31.7s} (J2000),
                 164.8135d {+10h 59m 15.2s} (current),
                 163.8074d {+10h 55m 13.7s} (1950)
GRB_DEC:         +67.5230d {+67d 31' 22.7"} (J2000),
                 +67.4634d {+67d 27' 48.2"} (current),
                 +67.7909d {+67d 47' 27.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       26 [cnts]
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7516.76 SOD {02:05:16.76} UT,   155.4 [sec] since BAT Trigger Time
CENTROID_X:      293.77,  raw= 294  [pixels]
CENTROID_Y:      297.54,  raw= 298  [pixels]
ROLL:            31.61 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -1.07
GRB_POS_XRT_Z:   -20.09
IMAGE_URL:       sw00444643000msxps_rw.img
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 59"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.72d {+22h 30m 53s}   -4.27d {-04d 16' 23"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.06, 46.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:05:59 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.6321d {+10h 58m 31.7s} (J2000),
                 164.8135d {+10h 59m 15.2s} (current),
                 163.8074d {+10h 55m 13.7s} (1950)
GRB_DEC:         +67.5230d {+67d 31' 22.7"} (J2000),
                 +67.4634d {+67d 27' 48.2"} (current),
                 +67.7909d {+67d 47' 27.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       26 [cnts]
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7516.76 SOD {02:05:16.76} UT,   155.4 [sec] since BAT Trigger Time
CENTROID_X:      293.77,  raw= 294  [pixels]
CENTROID_Y:      297.54,  raw= 298  [pixels]
ROLL:            31.61 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -1.07
GRB_POS_XRT_Z:   -20.09
IMAGE_URL:       sw00444643000msxps_rw.img
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 59"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.72d {+22h 30m 53s}   -4.27d {-04d 16' 22"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.06, 46.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:06:44 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.589d {+10h 58m 21s} (J2000),
                 164.770d {+10h 59m 05s} (current),
                 163.763d {+10h 55m 03s} (1950)
GRB_DEC:         +67.516d {+67d 30' 58"} (J2000),
                 +67.456d {+67d 27' 23"} (current),
                 +67.784d {+67d 47' 02"} (1950)
GRB_DATE:        15597 TJD;    36 DOY;   11/02/05
GRB_TIME:        7361.36 SOD {02:02:41.36} UT
TRIGGER_INDEX:   20000
GRB_PHI:         159.99 [deg]
GRB_THETA:        43.20 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.04 [sigma]
LC_URL:          sw00444643000msb.lc
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 58"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.73d {+22h 30m 54s}   -4.27d {-04d 16' 13"}
MOON_DIST:       116.63 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.09, 46.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      128.66, 53.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 317.42,19.58 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:08:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.619d {+10h 58m 29s} (J2000)
POINT_DEC:       +67.520d {+67d 31' 12"} (J2000)
POINT_ROLL:      31.602d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7525.38 SOD {02:05:25.38} UT,   164.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.517
N_STARS:         47
X_OFFSET:        384 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1343 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00444643000msufc0164.fits
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 57"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.74d {+22h 30m 57s}   -4.27d {-04d 15' 55"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:08:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.619d {+10h 58m 29s} (J2000)
POINT_DEC:       +67.520d {+67d 31' 12"} (J2000)
POINT_ROLL:      31.602d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7525.38 SOD {02:05:25.38} UT,   164.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.517
N_STARS:         47
X_OFFSET:        384 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1343 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00444643000msufc0164.fits
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 57"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.74d {+22h 30m 58s}   -4.26d {-04d 15' 50"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:09:31 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.619d {+10h 58m 29s} (J2000)
POINT_DEC:       +67.520d {+67d 31' 12"} (J2000)
ROLL:            31.602d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7525.38 SOD {02:05:25.38} UT,   164.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318564332
X_OFFSET:        832 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       992
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0171.fits
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 56"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.75d {+22h 30m 59s}   -4.26d {-04d 15' 40"}
MOON_DIST:       116.62 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:09:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.619d {+10h 58m 29s} (J2000)
POINT_DEC:       +67.520d {+67d 31' 12"} (J2000)
ROLL:            31.602d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7525.38 SOD {02:05:25.38} UT,   164.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318564332
X_OFFSET:        832 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       992
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0171.fits
SUN_POSTN:       318.37d {+21h 13m 29s}  -16.07d {-16d 03' 56"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.75d {+22h 31m 00s}   -4.26d {-04d 15' 37"}
MOON_DIST:       116.61 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:12:35 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.519d {+67d 31' 07"} (J2000)
POINT_ROLL:      31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7683.29 SOD {02:08:03.29} UT,   321.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.475
N_STARS:         112
X_OFFSET:        512 [pixels]
Y_OFFSET:        537 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1496 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00444643000msufc0321.fits
SUN_POSTN:       318.37d {+21h 13m 30s}  -16.07d {-16d 03' 54"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.77d {+22h 31m 05s}   -4.25d {-04d 15' 03"}
MOON_DIST:       116.61 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:12:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.519d {+67d 31' 07"} (J2000)
POINT_ROLL:      31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7683.29 SOD {02:08:03.29} UT,   321.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.475
N_STARS:         112
X_OFFSET:        512 [pixels]
Y_OFFSET:        537 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1496 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00444643000msufc0321.fits
SUN_POSTN:       318.37d {+21h 13m 30s}  -16.07d {-16d 03' 54"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.77d {+22h 31m 06s}   -4.25d {-04d 15' 00"}
MOON_DIST:       116.61 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:13:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.519d {+67d 31' 07"} (J2000)
ROLL:            31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7683.29 SOD {02:08:03.29} UT,   321.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318564489
X_OFFSET:        832 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       992
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0328.fits
SUN_POSTN:       318.37d {+21h 13m 30s}  -16.06d {-16d 03' 53"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.78d {+22h 31m 07s}   -4.25d {-04d 14' 50"}
MOON_DIST:       116.60 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:13:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.519d {+67d 31' 07"} (J2000)
ROLL:            31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7683.29 SOD {02:08:03.29} UT,   321.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318564489
X_OFFSET:        832 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       992
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0328.fits
SUN_POSTN:       318.37d {+21h 13m 30s}  -16.06d {-16d 03' 53"}
SUN_DIST:        125.84 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.78d {+22h 31m 07s}   -4.25d {-04d 14' 47"}
MOON_DIST:       116.60 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:17:15 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.6296d {+10h 58m 31.10s} (J2000),
                 164.8111d {+10h 59m 14.65s} (current),
                 163.8049d {+10h 55m 13.16s} (1950)
GRB_DEC:         +67.5253d {+67d 31' 31.0"} (J2000),
                 +67.4657d {+67d 27' 56.5"} (current),
                 +67.7932d {+67d 47' 35.5"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.70 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  7530.00 SOD {02:05:30.00} UT,   168.6 [sec] since BAT Trigger Time
SUN_POSTN:       318.38d {+21h 13m 30s}  -16.06d {-16d 03' 50"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.81d {+22h 31m 13s}   -4.24d {-04d 14' 07"}
MOON_DIST:       116.59 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.06, 46.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 8.6 arcsec from the XRT position.

GCN Circular #11629
A. P. Beardmore (U Leicester), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), M. M. Chester (PSU), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL), M. H. Siegel (PSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.), M. Stamatikos (OSU/NASA/GSFC), C. A. Swenson (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 02:02:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110205A (trigger=444643). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 164.589, +67.516 which is
```
   RA(J2000) = 10h 58m 21s
   Dec(J2000) = +67d 30' 58"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT lightcurve shows activity with multiple peaks until at least T+300 seconds, with a peak count rate of 4500 counts/s (15-150 keV) at T+210 s.
The XRT began observing the field at 02:05:16.8 UT, 155.4 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 164.6321, +67.5230 which is equivalent to:
```
   RA(J2000)  = 10h 58m 31.70s
   Dec(J2000) = +67d 31' 22.7"
```
with an uncertainty of 6.2 arcseconds (radius, 90% containment). This location is 64 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 164 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
   RA(J2000) = 10:58:31.12 = 164.62965
   DEC(J2000) = +67:31:31.2 = 67.52532
```
with a 90%-confidence error radius of about 0.63 arc sec. This position is 9.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.71 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:20:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.518d {+67d 31' 06"} (J2000)
POINT_ROLL:      31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  8236.78 SOD {02:17:16.78} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.647
N_STARS:         166
X_OFFSET:        272 [pixels]
Y_OFFSET:        297 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1736 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00444643000msufc0875.fits
SUN_POSTN:       318.38d {+21h 13m 31s}  -16.06d {-16d 03' 48"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.83d {+22h 31m 19s}   -4.23d {-04d 13' 32"}
MOON_DIST:       116.59 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:20:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.518d {+67d 31' 06"} (J2000)
POINT_ROLL:      31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  8236.78 SOD {02:17:16.78} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.647
N_STARS:         166
X_OFFSET:        272 [pixels]
Y_OFFSET:        297 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1736 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00444643000msufc0875.fits
SUN_POSTN:       318.38d {+21h 13m 31s}  -16.06d {-16d 03' 48"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.83d {+22h 31m 19s}   -4.22d {-04d 13' 28"}
MOON_DIST:       116.58 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:21:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.518d {+67d 31' 06"} (J2000)
ROLL:            31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  8236.78 SOD {02:17:16.78} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318565043
X_OFFSET:        831 [pixels]
Y_OFFSET:        856 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1016
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0882.fits
SUN_POSTN:       318.38d {+21h 13m 31s}  -16.06d {-16d 03' 47"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.84d {+22h 31m 22s}   -4.22d {-04d 13' 12"}
MOON_DIST:       116.58 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN Circular #11630
Klotz A. (CESR-OMP), Gendre B. (ASDC), Lass M. (UWA), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 110205A detected by SWIFT (trigger 444643) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 90.6s after the GRB trigger. The elevation of the field decreased from 65 degrees above horizon and weather conditions were good.
We detect a new source in the error box given by SWIFT We detected the candidate couterpart mentioned by Beardmore et al. (GCNC 11629) at the following position (+/- 1 arcsec):
```
RA(J2000.0) = 10h 58m 31.25s
DEC(J2000.0) +67d 31' 31.4"
```
OT optical brightness increased until R~16.7 about 225s after GRB. Then it decreases.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:22:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     444643,   Seg_Num: 0
POINT_RA:        164.624d {+10h 58m 30s} (J2000)
POINT_DEC:       +67.518d {+67d 31' 06"} (J2000)
ROLL:            31.610d
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  8236.78 SOD {02:17:16.78} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318565043
X_OFFSET:        831 [pixels]
Y_OFFSET:        856 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1016
BINNING_INDEX:   1
IM_URL:          sw00444643000msuni0882.fits
SUN_POSTN:       318.38d {+21h 13m 31s}  -16.06d {-16d 03' 47"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.84d {+22h 31m 22s}   -4.22d {-04d 13' 09"}
MOON_DIST:       116.58 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.07, 46.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.68, 53.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 05 Feb 11 02:31:22 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     444643,   Seg_Num: 0
GRB_RA:          164.6280d {+10h 58m 30.71s} (J2000),
                 164.8095d {+10h 59m 14.26s} (current),
                 163.8032d {+10h 55m 12.77s} (1950)
GRB_DEC:         +67.5252d {+67d 31' 30.7"} (J2000),
                 +67.4656d {+67d 27' 56.2"} (current),
                 +67.7931d {+67d 47' 35.1"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15597 TJD;    36 DOY;   11/02/05
IMG_START_TIME:  8277.00 SOD {02:17:57.00} UT,   915.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       318.39d {+21h 13m 33s}  -16.06d {-16d 03' 40"}
SUN_DIST:        125.83 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      337.91d {+22h 31m 39s}   -4.19d {-04d 11' 17"}
MOON_DIST:       116.55 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      138.06, 46.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.67, 53.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #11631
B. E. Schaefer (Louisiana State), H. Flewelling (IfA/Hawaii), W. Rujopakarn (Steward), T. Guver (U Arizona), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 110205A (Swift trigger 444643). The first image was at 02:04:03.4 UT, 82.0 s after the burst (8.4 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. On the first images, we detect a 17.0 magnitude source with coordinates:
10:58:31.11 +67:31:31.91 (J2000), with positional uncertainty of 1" or better
```
start UT    	mag     mlim(of image)
----------------------------------
02:06:00.5     17.0     17.6 
```
This source is at the position of the Swift XRT and UVOT transients, and not visible in DSS (second epoch), 2MASS or the MPChecker database. On our first two sets of ten images, the source is faint, near our limit, while for our third and fourth coadded images the source has significnatly brightened by over two magnitudes, apparently to magnitude around 13.9.
Continuing observations are in progress.
GCN Circular #11632
Klotz A. (CESR-OMP), Gendre B. (ASDC), Lass M. (UWA), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:
We continue to acquire images the field of GRB 110205A (cf. Klotz et al. GCNC 11630). After a first peak of brightness R~16.7 at t~225s, the flux decreased at R~18 about 360s after the trigger.
Then, the brightness increased dramatically and reached R~14.1 at t~1150s. Now the flux decreases slowly: R~15.0 at t~1800s.
GCN Circular #11633
C.G. Mundell, R.J. Smith, Z. Cano (ARI, LJMU) report on behalf of a larger collaboration:
The Liverpool Telescope began automatically observing Swift GRB 110205A (Beardmore et al. GCN 11629) with the RINGO2 polarimeter.
Subsequent automatic imaging detects the afterglow candidate reported by Beardmore et al., Klotz et al. (GCN 11630) and Schaefer et al. (GCN 11631) at:
RA=10:58:31.1 , Dec=+67:31:30.9 (J2000) +/-0.2"
with preliminary magnitude R=16.06 mag (wrt USNO B1) at t=924 secs.
Observations have stopped due to bad weather.
GCN Circular #11634
M. M. Chester(PSU) and A. P. Beardmore report on behalf of the Swift/UVOT team:
The Swift/UVOT obtained three finding chart exposures of the field of GRB 110205A (A. P. Beardmore et al., GCN Circ. 11629) which show the brightening reported by Klotz et al. (GCN Circ. 11630 and 11632) and Schaefer et al. (GCN Circ. 11631). Preliminary magnitudes using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)    Mag     Mag_err
white_FC       164           314           150       18.71   0.15
u_FC           321           571           250       18.17   0.15
white_FC       875          1025           150       15.4    0.4
```
Observations are continuing.
GCN Circular #11635
R. da Silva (UCO/Lick), M. Fumagalli (UCO/Lick), G. Worseck (UCO/Lick), and X. Prochaska (UCO/Lick) report on behalf of GRAASP:
"We have observed GRB 110205A with the Kast dual spectrometer on the 3m Lick telescope for a series of three 1800s exposures starting at UT 04:47 under variable conditions and at high air mass.
We observe a significant absorption feature (EW > 100mA) at ~3600Ang which we interpret as a z~1.98 DLA associated with the GRB host. We identify additional absorption features at ~3875A and 3980A which are roughly consistent with OI 1302 and CII 1334 transitions at the coincident redshift.
On the other hand, we do not detect a significant feature at CIV nor any significant features redward of ~6000Ang where we would expect FeII 2344, 2374, and 2382 absorption."
Further analysis is in progress.
GCN Circular #11636
A. N. Morgan, C. R. Klein, and J. S. Bloom (UC Berkeley) report:
We observed the field of GRB 110205A (Beardmore et al., GCN 11629) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2011-Feb-05 05h14m03s UT, ~3.2 hours after the Swift trigger. In mosaics (effective exposure time of 0.50 hours) taken simultaneously in the J, H, and Ks filters, we detect a source at the position of the optical afterglow (Klotz et al., GCN 11630; Schaefer et al., GCN 11631; Mundell et al., GCN 11633).
The preliminary photometry yields:
```
post burst
t_mid (hr) exp.(hr) filt  mag    m_err
3.59       0.50     J     16.74  0.05
3.59       0.50     H     15.81  0.05
3.59       0.50     Ks    15.19  0.07
```
All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Observations are continuing.
GCN Circular #11637
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report:
GRAS 005 (Global-Rent-a-Scope, Mayhill, New Mexico) Takahashi Epsilon 250 10" FL 850 mm and SBIG ST-10XME camera were used to detect GRB 110205A optical afterglow. The observations were started at 2011-02-05 02:56:38 (UT) and stopped at 2011-02-05 04:24:38 (UT). Four unfiltered and four photometric R observations with 300s and 600s exposure times were made. The afterglow was detected at following position RA 10 58 31.16 and DEC +67 31 31.1 consistent those given by Klotz A. et al. (GCN 11630) to within positional errors.
The following magnitudes were obtained from the observations using NOMAD1 1574-0155978 (R = 16.100) as the comparison:
```
Tmid(s)+T0 Filter        Exp (sec)     Mag      Mag err   Limit
3537           unfilt         600             16.3         0.1         19.7
4249           Rc            600             16.5         0.1         18.9
5327           unfilt         300             16.8         0.1         19.7
5858           Rc            600             17.0         0.1         18.9
6379           Rc            300             17.3         0.1         18.9
6903           unfilt         600             17.3         0.1         19.7
7993           Rc            300             17.6         0.1         18.9
8367           unfilt         300             17.6         0.1         19.7
```
A jpg image of the 600sec clear filter observation is available at the following URL link: http://cutenews.kassiopeia.net/data/upimages/GRB110205A.jpg
GCN Circular #11638
S. B. Cenko (UC Berkeley), J. L. Hora (CfA), and J. S. Bloom (UC Berkeley) report on behalf of a larger collaboration:
We obtained a pair of spectra of the optical afterglow of GRB 110205A (Beardmore et al., GCN 11629) with the FAST spectrograph mounted on the FLWO 1.5 m telescope. Observations began at 6:27 UT (~ 4.5 hours after the burst) and cover the wavelength range from 3500-7400 A.
As reported by da Silva et al (GCN 11635), the spectrum exhibits a prominent DLA absorption feature; however, we observe this feature at a slightly larger wavelength (~ 3900 A). We further identify a series of narrow absorption features, including Si II, Si II*, C IV, and Al II, at a common redshift of z=2.22. The detection of Si II*, together with the DLA system, strongly suggest this is the host galaxy of GRB 110205A.
GCN Circular #11639
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 3847 s of XRT Photon Counting mode data and 7 UVOT images for GRB 110205A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 164.62969, +67.52521 which is equivalent to:
```
RA (J2000): 10h 58m 31.13s
Dec (J2000): +67d 31' 30.8"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11640
Paul Vreeswijk (U. Iceland), Paul Groot (Radboud U. Nijmegen), Philip Carter (U. Warwick), Dong Xu (WIS), Annalisa De Cia, P. Jakobsson (U. Iceland) and Johan Fynbo (DARK) report on behalf of a larger collaboration:
We have observed the field of GRB 110205A (Beardmore et al., GCN 11629) with the 2.5m NOT telescope at Roque de los Muchachos Observatory (La Palma, Spain) equipped with ALFOSC starting at 3:25 UT (1.4h after the burst). Despite thick clouds, the optical afterglow is clearly detected at R ~ 16.7 (as compared to nearby USNO-B1.0 stars).
Preliminary reduction of the subsequent spectroscopic observations shows a clear DLA and several metal absorption lines (OI/OI*, CII/CII*, CIV, AlII, FeII) at a common redshift z=2.22, confirming the redshift measurement by Cenko et al. (GCN 11638).
GCN Circular #11641
M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed field of the Swift GRB 110205A (Beardmore et al, GCN 11629) with Zeiss-600 telescope of Mt.Terskol observatory in R,V filters starting on Feb. 05 (UT) 02:16. We clearly detect optical afterglow (Beardmore et al, GCN 11629, Klotz et al, GCN 11630, Schaefer et al, GCN 11631, Mundell et al, GCN 11633) and confirm the optical flare at ~ 1140 s (Schaefer et al, GCN 11631, Klotz et al, GCN 11632, Chester et al, GCN 11634) with maximal brightness R ~ 13.7.
The finding chart and preliminary light curves can be found at http://grb.rssi.ru/GRB110205A/
GCN Circular #11643
Myungshin Im (CEOU/SNU), and Yuji Urata (NCU) on behalf of a larger collaboration
We are taking images of the field around GRB 110205A (GCN 11629) in B and R filters using the 1.0m telescope at Mt. Lemmon, AZ, USA, starting at 2011 February 5, 05:19:11 UT (roughly 3.28 hrs after the burst alert).
We clearly identify the afterglow (GCN 11630 et al.) in all the image taken so far.. The first image of the observation shows that the afterglow is at R = 18.0 +- 0.1 (Vega), calibrated against a star in the USNO B-1 catalog at RA=10:58:34.2 and Dec=+67:31:45.3.
The observation and the further analysis of the data are onging. We thank the LOAO operator, Jae-Hyuck Youn, for his assitance of the observation.
GCN Circular #11644
A. P. Beardmore (U Leicester) reports on behalf of the Swift-XRT team:
We have analysed 14 ks of XRT data for GRB 110205A (Beardmore et al. GCN Circ. 11629), from 145 s to 30.7 ks after the BAT trigger. The data comprise 737 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 11639).
The light curve comprises a number of flares (at ~T0+145 s, T0+175 s to T0+275 s, T0+615 s) followed by a power-law decay. The late-time light curve (from T0+5.1 ks) can be modelled with a power-law decay with a decay index of alpha=1.63 (+/-0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.420 (+/-0.020). The best-fitting absorption column is 4.2 (+/-0.6) x 10^21 cm^-2, at a redshift of 2.22, in addition to the Galactic value of 1.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.99 (+0.08, -0.07) and a best-fitting absorption column of 3.5 (+1.6, -1.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 1.6 x 10^20 cm^-2
Intrinsic column:    3.5 (+1.6, -1.5) x 10^21 cm^-2 at z=2.22
Photon index:	     1.99 (+0.08, -0.07)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00444643.
This circular is an official product of the Swift-XRT team.
GCN Circular #11645
Michael J. Cook, Newcastle Observatory report:
On 5 February UT, the field of GRB 110205A detected by SWIFT (trigger 444643) was observed, beginning approximately 49 minutes after the GRB trigger, with the Newcastle Observatory 0.4 meter robotic telescope, located in Newcastle, Ontario, Canada (Bortle Class 4-5 sky).
Observations were made under transparent skies, but with poor seeing. Weather was good with an ambient temperature of -4C. No Moon was present.
Automatic imaging in the V-band detected the afterglow candidate reported by Beardmore et al., Klotz et al. (GCN 11630) at:
RA 10: 58: 31.34 DEC +67 31 31.4 (J2000)
A 180s calibrated image gives a preliminary magnitude of 15.41 (V-band). The magnitude is estimated with the nearby NOMAD1 star 1574-0155894 (Vmag 15.240)
A time-series was taken from 02:52:09 to 07:23:05 and further analysis is in progress.
This message is quotable in publications.
GCN Circular #11646
GRB 110205A: Swift-BAT refined analysis
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to ~T+2000 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110205A (trigger #444643) (Beardmore, et al., GCN Circ. 11629). The BAT ground-calculated position is RA, Dec = 164.603, 67.533 deg, which is
```
   RA(J2000)  =  10h 58m 24.8s 
   Dec(J2000) = +67d 31' 57.1" 
```
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 29%.
The mask-weighted light curve shows many overlapping peaks with a general slow rise starting at ~T-120 sec, with the tallest peak at ~T+210 sec, and ending at ~T+1500 sec. T90 (15-350 keV) is 257 +- 25 sec (estimated error including systematics).
The time-averaged spectrum from T-129 to T+377 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.80 +- 0.04. The fluence in the 15-150 keV band is 1.7 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+210.44 sec in the 15-150 keV band is 3.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/444643/BA/
GCN Circular #11647
Francois Kugel at Obs.Chante-Perdix,04 Banon,Fr
Observer : C. RINNER; F. KUGEL
We imaged the field of GRB 110205A detected by SWIFT(trigger 444643) with the 0.5-m F/3 reflector + ccd kai 11k (No filter). The observations started at 04:30:52 (UT) The elevation of the field decreased from 54 degrees above horizon and weather conditions were good. We clearly identify the afterglow and the flux decreases slowly.
```
USNO-SA 2.0 R
 Exp  : hh:mm:ss
 180s : 04:32:22 (UT) =3D 10h58m31.149s +67=C2=B031'30.89''    17.44 +/-0.08
 180s : 04:48:32 (UT) =3D 10h58m31.173s +67=C2=B031'30.88''    17.84 +/-0.16
 120s : 05:38:46 (UT) =3D 10h58m31.173s +67=C2=B031'30.86''    18.09 +/-0.35
 120s : 05:51:26 (UT) =3D 10h58m31.169s +67=C2=B031'30.71''    17.99 +/-0.64
```
Image & measurement : http://astrosurf.com/obsdauban/pages/GRB110205A.html
GCN Circular #11648
Yuji Urata, Chia-Jung Chuang (NCU) and Kuiyun Huang (ASIAA) on behalf of EAFON
"We are monitoring the optical afterglow of GRB110205A (GCN 11630, 11631) in g', r' and i' filters using the 1.0m telescope at Mt. Lulin, Taiwan. The observations are started at 2011 February 5, 13:02 UT. Based on our r'-band photometry against with the SDSS catalog, the temporal decay index between 40000 and 52740 sec after the burst is about 1.9. The brightness in r'-band at 52740 sec after the burst is 20.64 +/-0.05 mag.
The further monitoring observation and analysis are ongoing.
GCN Circular #11649
M. M. Chester (PSU) and A. P. Beardmore (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110205A 164 s after the BAT trigger (Beardmore et al., GCN Circ. 11629). The peak near 1000s reported by Klotz et al. (GCN Circ. 11632) and Andreev et al. (GCN Circ. 11641) is seen in the UVOT optical filters and one of the UV filters (uvw1), consistent with the reported redshift z=2.22 (Cenko et al., GCN Circ. 11638 and Vreeswijk et al., GCN Circ. 11640). The weak detections (2-3 sigma) in uvw2 are probably due to the filter's extended sensitivity in the red. After 5000s, the estimated temporal slope in the white filter is 1.6. Preliminary photometry using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the finding chart (FC) and subsequent exposures is:
```
FILTER     TSTART   TSTOP    MAG    +/-   UL(2o)
white_FC     164.0    313.8  18.79  0.07
white        601.9    621.7  17.01  0.08
white        774.6    794.4  15.74  0.06
white_FC     875.4   1025.1  15.36  0.04
white       1181.0   1375.8  15.39  0.05

v            652.0    671.8  15.76  0.11
v            824.3    844.1  14.98  0.08
v           1056.5   1251.8  14.68  0.06

b            577.5    597.3  17.10  0.12
b            750.3    770.1  15.77  0.07
b           1154.7   1351.5  15.33  0.05

u_FC         321.9    571.7  18.24  0.09
u            725.4    745.2  15.59  0.09
u           1130.5   1325.1  15.02  0.06

uvw1         701.0    720.8  18.23  0.41
uvw1        1106.0   1300.8  17.09  0.17

uvm2         676.3   1276.1               19.89
uvm2        1430.1   1795.8               19.60

uvw2         627.4   1226.2  19.89  0.49
uvw2        1381.4   1747.0  19.28  0.41
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11650
Glen Petitpas (SMA), Ashley Zauderer, Edo Berger, Nimesh Patel, Erin Brassfield (Harvard/CfA), Jen Miller, Anil Dosaj (SMA) report:
We observed GRB110205A (GCN #11629) with the Submillimeter Array (SMA) at 1.3 mm (225 GHz) starting 1.3 hours after the burst for a duration of 6 hours. No source is detected in coincidence with the optical afterglow (GCN #11629). With a combined 8 GHz of bandwidth, the resulting 3-sigma upper limit is 1.65 mJy.
GCN Circular #11651
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 110205A (Beardmore et al., GCNC 11629) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2011-02-05 10:37:55 UT (~8.6 hours after the burst). We detected the previously reported afterglow (Klotz et al., GCNC 11630; Schaefer et al., GCNC 11631) in all the three bands.
Photometric results and are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.39965    11:38:11   6120.0    >20.1         19.4  0.2    18.5  0.2
0.48327    13:38:36   6300.0     20.6   0.3   20.4  0.3    19.7  0.3
0.56675    15:38:49   6300.0     21.2   0.4   19.8  0.2    19.7  0.2
----------------------------------------------------------------------
```
T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN Circular #11652
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 110205A (Beardmore et al., GCNC 11629) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 2011-02-05 12:15:24 UT (~10.2 hours after the burst). We detected the previously reported afterglow (Klotz et al., GCNC 11630; Schaefer et al., GCNC 11631) in all the three bands.
Photometric results are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.45691    13:00:38    4500.0    21.0   0.2   20.2   0.1   19.8   0.2
0.76876    20:29:42    4620.0    21.5   0.2   20.8   0.1   20.2   0.2
----------------------------------------------------------------------
```
T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN Circular #11653
Yuji Urata, Chia-Jung Chuang (NCU) and Kuiyun Huang (ASIAA) on behalf of EAFON report
"We made a further optical afterglow observation with r'-band using the Lulin 1m telescope. The stacked image made from 7 frames with 600s exposure shows the afterglow clearly. The brightness calibrated against with the SDSS catalog is r'=22.49+/-0.12 at 1.53 days after the burst. This is consistent with the extrapolation of the simple power-law decay with the temporal index of about 1.9 from our previous report (GCN 11648)."
GCN Circular #11655
T. N. Ukwatta (MSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.), N. Gehrels (GSFC), J. Linnemann (MSU), K. Tollefson (MSU), and U. Abeysekara (MSU)
We observed the Swift GRB 110205A (Beardmore et al., GCN 11629) with the Lightbuckets 0.61m rental telescope LB-0001 in Rodeo, NM, USA. Under good weather conditions, two observations were carried out in the Luminance and R filter starting 2011-02-05 at 07:45:58 UT (~ 5.7 hours after the GRB trigger) and 09:39:21 UT (~7.6 hours after the GRB trigger). Another followup observation was performed on R filter starting 2011-02-06 at 09:29:04 UT (~1.31 days after the trigger) under acceptable weather conditions.
The burst afterglow is clearly detected in the first two observations and estimated magnitudes are given below:
```
Time after trigger       Exposure (s)   Filter     Magnitude

5.7  hours (0.24 days)     1 x 300        Lum     19.0 +/- 0.1
7.6  hours (0.31 days)     1 x 300         R      19.6 +/- 0.2
31.4 hours (1.31 days)     2 x 300         R      > 20.1
```
The afterglow, not corrected for Galactic extinction, is calibrated against the USNO-B1.0 catalog.
We acknowledge the helpful assistance of the Lightbuckets staff, in particular Stephen G. Cullen.
GCN Circular #11659
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team report:
The long GRB 110205A (Swift-BAT trigger #444643: Beardmore et al., GCN 11629; Markwardt et al., GCN 11646) was detected by Konus-Wind in the waiting mode.
The burst light curve shows a multipeaked pulse started at ~T0(BAT) with a total duration of ~330 s. There is a weak pulse at ~T0(BAT)-1360 s (seen by the same detector which observed GRB 110205A; the detection significance is ~4.5 sigma in the G1+G2 (20-360 keV) band; the pulse duration is ~25 s), which might be a burst precursor. There is a hint of a weak soft tail seen up to ~T0+1200 s.
As observed by Konus-Wind, the burst had a fluence of (3.66 +/- 0.35)x10^-5 erg/cm2 and a 3-s peak flux measured from T0+211.6 s of (5.1 +/- 0.7)x10^-7 erg/cm2/s (both in the 20 - 1200 keV energy range).
Modeling the K-W 3-channel time-integrated spectrum (from T0 s to T0+330 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.52 +/- 0.14, and Ep = 222 +/- 74 keV.
Assuming z = 2.22 (Cenko & Hora, GCN 11638; Vreeswijk et al. GCN 11640) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release E_iso is (1.36 +/- 0.13)x10^54 erg, the peak luminosity (L_iso)_max is (5.9 +/- 0.8)x10^51 erg/s, and Ep_rest is 715 +/- 238 keV.
All the quoted errors are estimated at the 1 sigma confidence level.
The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB110205A/
GCN Circular #11661
GRB110205A: CARMA 3mm Observations
Ashley Zauderer, Edo Berger (Harvard) and Dale Frail (NRAO) report:
We observed GRB110205A (GCN 11629) with CARMA at 3 mm (93 GHz) starting 2.1 hours after the burst for a total on-source time of 2.3 hours. No millimeter emission is detected in coincidence with the optical afterglow position (GCN 11629) to a 3-sigma limit of 0.6 mJy.
We thank the CARMA observatory staff for support of these observations.
GCN Circular #11663
A.J. van der Horst (USRA), C. Kouveliotou (NASA/MSFC), A.P. Kamble (U of Wisconsin Milwaukee) and R.A.M.J. Wijers (U of Amsterdam) report on behalf of a larger collaboration:
"We observed the position of the GRB 110205A afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope at February 6 19.44 UT to February 7 07.41 UT, i.e. 1.72 - 2.22 days after the burst (GCN 11629). We do not detect a radio source at the position of the optical counterpart (GCN 11633). The three-sigma rms noise in the map around that position is 105 microJy per beam. The formal flux measurement for a point source at the position of the optical counterpart is 44 +/- 35 microJy.
We would like to thank the WSRT staff for scheduling and obtaining these observations."

GCN Circular #11666
A. N. Morgan and J. S. Bloom (UC Berkeley) report:
We continued to observe the location of the NIR afterglow of GRB 110205A (Morgan et al. GCN 11636) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona throughout the night of February 5th and again on 2011-02-06. The afterglow continued to be well detected throughout the first night.
The preliminary photometry yields:

post burst
t_mid (hr) exp.(hr) filt  mag    m_err
4.63       0.64     J     17.01  0.05
4.63       0.64     H     16.26  0.06
4.63       0.64     Ks    15.43  0.07

5.63       0.64     J     17.23  0.06
5.63       0.64     H     16.37  0.07
5.63       0.64     Ks    15.71  0.09

6.63       0.64     J     17.46  0.07
6.63       0.64     H     16.71  0.09
6.63       0.64     Ks    16.0   0.1

7.64       0.64     J     17.9   0.1
7.64       0.64     H     17.0   0.1
7.64       0.64     Ks    16.3   0.2

8.64       0.64     J     17.8   0.1
8.64       0.64     H     17.3   0.2
8.64       0.64     Ks    16.3   0.2

9.64       0.64     J     18.2   0.2
9.64       0.64     H     17.5   0.3
9.64       0.64     Ks    16.8   0.3

10.6       0.64     J     18.4   0.2
10.6       0.64     H     17.6   0.3
10.6       0.64     Ks    16.7   0.3

30.7       4.45     J     >20.1  3sig
30.7       4.45     H     >19.0  3sig
30.7       4.45     Ks    >18.3  3sig

The late time decay index is consistent with that seen in the optical (Urata et al. GCN 11648). All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.

GCN Circular #11670
D.K. Sahu and Pepsi Anto (Indian Institute of Astrophysics, Bangalore) report. Optical afterglow of the Swift GRB 110205A (Beardmore et al., GCN 11629) was observed with the 2m. Himalayan Chandra Telescope of the Indian Astronomical Observatory, Hanle, India, under poor sky condition. The optical afterglow was observed in Bessell R filter and was detected in all the frames.
The preliminary magnitudes of the optical afterglow, calibrated using NOMAD1 1574-0155978 (R = 16.100) (Veli-Pekka et al., GCN11637), are as under:
```
Date		Mid UT	Exposure       R mag
05-02-2011	20:50	6 x 180sec  21.11 +/- 0.05
05-02-2011	21:13	3 x 180sec  21.19 +/- 0.08
05-02-2011	22:09	1 x 600sec  21.18 +/- 0.10
```
This message may be cited.
GCN Circular #11672
A. Volnova , E. Elunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the Swift GRB 110205A (Beardmore et al., GCN 11629) with AZT-33IK telescope of Sayan observatory (Mondy) on Feb.05 between (UT) 12:06:19 and 20:25:34, and we took several series in R-band with exposures 60 - 180s.
The optical afterglow (Beardmore et al., GCN 11629) is clearly detected on the stacked images. The photometry calibration performed against the USNO-B1.0 star 1575-0155390 ((J2000) RA = 10:58:34.20, Dec = +67:31:45.3), assuming R = 16.7:
```
T0+      Filter,   Exposure,          OT mag.,  UpperLimit
(mid, d)              (s)

0.43968 R  51x60                     19.88+/-0.04    21.9
0.71912 R  25x120+20x180     20.85+/-0.05    22.8
```
The power-law decay index during our observation is alpha ~1.8 which is consistent with the index reported by Urata et al., GCN 11648.
GCN Circular #11682
S. Sugita (Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), N. Vasquez (Tokyo Tech.), T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Tashiro, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), Y. Urata, P. Tsai (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report:
The long GRB 110205A (Swift/BAT trigger #444643 ; Beardmore et al., GCN 11629; Beardmore et al., GCN 11639,; Markwardt et al., GCN 11646) was detected by the the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 02:02:41 UT (=T0).
The observed light curve shows a multi-peaked structure starting at T0+20s, ending at T0+318s with a duration (T90) of 248 (+/- 51) seconds. The fluence in 100 - 1000 keV was 1.33 (+/- 0.23) x10^-5 erg/cm^2. The 1-s peak flux measured from T0+211s was 1.15 (+/- 0.23) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0+20s to T0+318s is well fitted by a single power-law with a photon index of 2.12 (+/- 0.17) (chi^2/d.o.f = 82.1/50). All the quoted errors are at statistical 90% confidence level.
The light curves with 1-sec time resolution for this burst is appeared at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html
GCN Circular #11692
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
S. Sugita (Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), N. Vasquez (Tokyo Tech.), T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Tashiro, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), Y. Urata, P. Tsai (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.) (i.e. the Suzaku WAM team):
We performed the Swift/BAT and the Suzaku/WAM joint spectral analysis of GRB 110205A (Swift/BAT trigger #444643: Beardmore et al., GCN Circ. 11629, Markwardt et al. GCN Circ. 11646). The joint spectral analysis of the Swift/BAT and the Suzaku/WAM data allows us to derive the broad-band spectral parameters of this burst.
The time interval of the spectral data for each instrument is chosen from T0(BAT)+20.2 to T0(BAT)+318.2 sec where T0(BAT) is the trigger time of BAT at 02:02:41.3 UTC. The energy ranges which we used in the joint spectral analysis are 15-150 keV and 100-3000 keV for the Swift/BAT and the Suzaku/WAM respectively. The spectral data of two instruments are fitted with the spectral model multiplied by the constant factor to take into account the systematic effective area uncertainties in the response matrices of each instrument.
The spectrum is well fitted with a power-law with exponential cutoff model: dN/dE ~ E^{alpha}*exp(-(2+alpha)*E/Epeak). The constant factors of each instrument agree within 10%. No systematic residual from the best fit model is seen in the spectral data of each instrument. The best fit spectral parameters are: alpha = -1.59 (-0.06/+0.07) and Epeak = 230 (-65/+135) keV (chi2/dof = 96.6/85). A simple power-law fit shows a poor fit to the data (chi2/dof=126.4/86). The best fit spectral parameters for the Band function fixing beta = -2.5 are: alpha = -1.57 (-0.08/+0.10), and Epeak = 200 (-60/+130) keV (chi2/dof = 96.9/85). Our best fit spectral parameters are consistent with the Konus-Wind result based on the 3 channel data (Golenetskii et al. GCN Circ. 11659). The energy fluence in the 15-3000 keV band calculated by a power-law with exponential cutoff model for this 298 sec interval is 2.7 (-0.4/+0.7)x10^-5 erg/cm2.
Assuming z = 2.22 (Cenko et al. GCN Circ. 11638; Vreeswijk et al. GCN Circ. 11640) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release is E_iso = 4.6 (-0.7/+0.4) x10^53 erg in 1 keV to 10 MeV at the GRB rest frame.
All the quoted errors are at the 90% confidence level.
GCN Circular #11696
J. Gorosabel (IAA-CSIC), R. Duffard (IAA-CSIC), P. Kubanek (IAA-CSIC & U. of Valencia), A. Guijarro (CAHA), report on behalf of a larger collaboration:
"We carried out optical linear polarization observations of the GRB 110205A afterglow (GCN Circ. 11629, Beardmore et al.) using the 2.2m telescope of the Calar Alto Observatory equipped with CAFOS. The data were acquired in the R-band on Feb 5.19879-5.26570 UT (2.73-4.33 hours post burst) with a total exposure time of 10x500s. A preliminary analysis reveals an afterglow linear polarization at a level of P~1.4%. This value is higher than the polarization (P ~< 0.4%) measured for the bright field stars, so we conclude that most of the measured afterglow polarization has very likely an extragalactic origin."
GCN Circular #11697
V. Pal'shin report on behalf of the Konus-Wind team:
The isotropic equivalent energy and peak luminosity of GRB 110205A given in GCN Circular 11659 have been erroneously computed.
The correct values for the isotropic equivalent energy is E_iso = (4.34 +/- 0.42)x10^53 erg, and for the isotropic peak luminosity is (L_iso)_max = (1.95 +/- 0.27)x10^52 erg/s (assuming z = 2.22 (Cenko & Hora, GCN 11638; Vreeswijk et al. GCN 11640) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73).
I thank Max De Pasquale and Takanori Sakamoto for pointing this out to me and I apologize for the error.
GCN Circular #11726
J. Kelemen (kelemen at konkoly.hu) on behalf of the GRB OT observing program at the Konkoly Observatory.
Starting on 05/02/2011 we observed the field of GRB 110205A detected by Swift (trigger #444643; Beardmore et al., GCN 11629)) with a 60/90 cm Schmidt telescope located at the Mountain Station of the Konkoly Observatory using V,R,I filters. Although the OT was visible on the frames we coadded images to achieve better S/N ratio due to the cloudy weather. The time column contains seconds counting from the trigger (J.D. 2455597.58520)
```
Time     Exp    Mag.    Error.   Filter    Flag.
 [s]     [s]          [3-sigma]
-------------------------------------------------
 61782    300	19.53   0.5       V
 66022   1800	18.97   0.4	  R
 70312    300	19.63   0.4       V					
 71671   1500	19.92   0.5	  R
 74194   1500	20.11   0.5	  I
 75323    300	19.67   0.4	  V
159722   2700	21.52   0.6	  R     Upper Level
--------------------------------------------------
```
GCN Circular #11740
A. Zauderer (Harvard), D. Frail (NRAO), and E. Berger (Harvard) report:
We observed the position of GRB 110205A (GCN 11629) with the EVLA starting 1.2 days after the burst. Preliminary reduction of these data gives a flux density of 182 +/-12 microJy at a frequency of 22 GHz. Further EVLA observations are on-going.
We thank the EVLA staff for their support of these observations.
1104.3382 from 19 Apr 11
Wei-Hong Gao: The physical origin of optical flares following GRB 110205A and the nature of the outflow
The optical emission of GRB 110205A is distinguished by two flares. In this work we examine two possible scenarios for the optical afterglow emission. In the first scenario, the first optical flare is the reverse shock emission of the main outflow and the second one is powered by the prolonged activity of central engine. We however find out that it is rather hard to interpret the late ($t>0.1$ day) afterglow data reasonably. In the second scenario, the first optical flare is the low energy prompt emission and the second one is the reverse shock of the initial outflow. Within this scenario we can interpret the late afterglow emission self-consistently. The reverse shock region may be weakly magnetized and the decline of the second optical flare may be dominated by the high latitude emission, for which strong polarization evolution accompanying the quick decline is possible, as suggested by Fan et al. in 2008. Time-resolved polarimetry by RINGO2-like polarimeters will test our prediction directly.
1107.3352 from 19 Jul 11
A. Cucchiara et al.: Constraining GRB Emission Physics with Extensive Early-Time, Multiband Follow-up
Understanding the origin and diversity of emission processes responsible for Gamma-ray Bursts (GRBs) remains a pressing challenge. While prompt and contemporaneous panchromatic observations have the potential to test predictions of the internal-external shock model, extensive multiband imaging has been conducted for only a few GRBs. We present rich, early-time, multiband datasets for two Swift events, GRB 110205A and GRB 110213A. The latter shows optical emission since the early stages of the prompt phase, followed by the steep rising in flux up to ~1000 seconds after the burst ($t^{-\alpha}$ with $\alpha=-6.13 \pm 0.75$). We discuss this feature in the context of the reverse-shock scenario and interpret the following single power-law decay as forward-shock dominated. Polarization measurements, obtained with the RINGO2 instrument mounted on the Liverpool Telescope, also provide hints on the nature of the emitting ejecta. The former event, instead, displays a very peculiar optical to near-infrared lightcurve, with two achromatic peaks. In this case, while the first peak is probably due to the onset of the afterglow, we interpret the second peak to be produced by newly injected material, signifying a late-time activity of the central engine.
1110.0734 from 5 Oct 11
B. Gendre et al.: GRB 110205A: Anatomy of a long gamma-ray burst
The Swift burst GRB 110205A was a very bright burst visible in the Northern hemisphere. GRB 110205A was intrinsically long and very energetic and it occurred in a low-density interstellar medium environment, leading to delayed afterglow emission and a clear temporal separation of the main emitting components: prompt emission, reverse shock, and forward shock. Our observations show several remarkable features of GRB 110205A : the detection of prompt optical emission strongly correlated with the BAT light curve, with no temporal lag between the two ; the detection of an X-ray excess above the extrapolation of the Band function measured in gamma-rays during the prompt phase ; and a large optical flare after the end of the prompt phase, that we interpret as a signature of the reverse shock. Beyond the pedagogical value offered by the excellent multi-wavelength coverage of a GRB with temporally separated radiating components, we discuss several questions raised by our observations: the nature of the prompt optical emission and the spectral evolution of the prompt emission at high-energies (from 0.5 keV to 150 keV) ; the origin of an x-ray flare at the beginning of the forward shock; and the modeling of the afterglow, including the reverse shock, in the framework of the classical fireball model.
1606.07193 from 24 Jun 16
S. Guiriec et al.: A Unified Model for GRB Prompt Emission from Optical to Gamma-Rays; a New Type of Standard Candle
The origin of prompt emission from gamma ray bursts remains to be an open question. Correlated prompt optical and gamma-ray emission observed in a handful of GRBs strongly suggests a common emission region, but failure to adequately fit the broadband GRB spectrum prompted the hypothesis of different emission mechanisms for the low- and high-energy radiations. We demonstrate that our multi-component model for GRB gamma-ray prompt emission provides an excellent fit to GRB 110205A from optical to gamma-ray energies. Our results show that the optical and highest gamma-ray emissions have the same spatial and spectral origin, which is different from the bulk of the X- and softest gamma-ray radiation. Finally, our accurate redshift estimate for GRB 110205A demonstrates promise for using GRBs as cosmological standard candles.

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Jochen Greiner, last update: 24-Jun-2016 [Disclaimer]