Gamma-ray Burst 100206A

(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 06 Feb 10 13:30:22 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     411412,   Seg_Num: 0
GRB_RA:           47.177d {+03h 08m 42s} (J2000),
                  47.316d {+03h 09m 16s} (current),
                  46.489d {+03h 05m 57s} (1950)
GRB_DEC:         +13.168d {+13d 10' 04"} (J2000),
                 +13.206d {+13d 12' 22"} (current),
                 +12.977d {+12d 58' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2459 [cnts]    Image_Peak=245 [image_cnts]
TRIGGER_DUR:     0.128 [sec] 
TRIGGER_INDEX:   32     E_range: 25-100 keV
BKG_INTEN:       50698 [cnts]
BKG_TIME:        48594.49 SOD {13:29:54.49} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15233 TJD;    37 DOY;   10/02/06
GRB_TIME:        48605.37 SOD {13:30:05.37} UT
GRB_PHI:          65.42 [deg]
GRB_THETA:        26.17 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     58.18 [sigma]
IMAGE_SIGNIF:    14.02 [sigma]
MERIT_PARAMS:     +1  +0  +0  -3  +2  +3  +0  +0  +0  +0 
SUN_POSTN:       320.09d {+21h 20m 23s}  -15.54d {-15d 32' 31"}
SUN_DIST:         90.90 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.83d {+15h 23m 20s}  -23.19d {-23d 11' 17"}
MOON_DIST:       169.47 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.88,-37.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       48.41, -4.31 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate 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 = 26.27,-9.06 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:30:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     287155807
GRB_RA:           76.410d {+05h 05m 38s} (J2000),
                  76.564d {+05h 06m 15s} (current),
                  75.650d {+05h 02m 36s} (1950)
GRB_DEC:         +23.860d {+23d 51' 36"} (J2000),
                 +23.873d {+23d 52' 23"} (current),
                 +23.793d {+23d 47' 34"} (1950)
GRB_ERROR:       2.00 [deg radius, statistical only]
DATA_SIGNIF:     27.50 [sigma]
DATA_INTERVAL:   0.064 [sec]
GRB_DATE:        15233 TJD;    37 DOY;   10/02/06
GRB_TIME:        48605.39 SOD {13:30:05.39} UT
GRB_PHI:          15.00 [deg]
GRB_THETA:        15.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       320.10d {+21h 20m 23s}  -15.54d {-15d 32' 30"}
SUN_DIST:        120.07 [deg]   Sun_angle= -7.8 [hr] (East of Sun)
MOON_POSTN:      230.84d {+15h 23m 22s}  -23.19d {-23d 11' 20"}
MOON_DIST:       156.44 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      179.25,-10.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       77.59,  1.00 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:30:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     287155807
GRB_RA:           44.717d {+02h 58m 52s} (J2000),
                  44.859d {+02h 59m 26s} (current),
                  44.015d {+02h 56m 03s} (1950)
GRB_DEC:         +17.633d {+17d 37' 60"} (J2000),
                 +17.673d {+17d 40' 24"} (current),
                 +17.434d {+17d 26' 03"} (1950)
GRB_ERROR:       11.52 [deg radius, statistical plus systematic]
GRB_INTEN:       2111 [cnts/sec]
DATA_SIGNIF:     25.80 [sigma]
INTEG_TIME:      0.064 [sec]
GRB_DATE:        15233 TJD;    37 DOY;   10/02/06
GRB_TIME:        48605.39 SOD {13:30:05.39} UT
GRB_PHI:           7.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 0.0640 [sec]
HARD_RATIO:      0.27
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  GRO_J0422_32
DETECTORS:       1,1,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.10d {+21h 20m 23s}  -15.54d {-15d 32' 31"}
SUN_DIST:         89.86 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      230.84d {+15h 23m 21s}  -23.19d {-23d 11' 18"}
MOON_DIST:       172.14 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      161.15,-35.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.37,  0.64 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 100.63,-21.03 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:31:28 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.153d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 18"} (J2000)
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48680.02 SOD {13:31:20.02} UT,   74.6 [sec] since BAT Trigger Time
COUNTS:          7    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        2    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:33:46 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     411412,   Seg_Num: 0
GRB_RA:           47.177d {+03h 08m 42s} (J2000),
                  47.316d {+03h 09m 16s} (current),
                  46.489d {+03h 05m 57s} (1950)
GRB_DEC:         +13.168d {+13d 10' 04"} (J2000),
                 +13.206d {+13d 12' 22"} (current),
                 +12.977d {+12d 58' 39"} (1950)
GRB_DATE:        15233 TJD;    37 DOY;   10/02/06
GRB_TIME:        48605.37 SOD {13:30:05.37} UT
TRIGGER_INDEX:   32
GRB_PHI:          65.42 [deg]
GRB_THETA:        26.17 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     0.128 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     58.18 [sigma]
IMAGE_SIGNIF:    14.02 [sigma]
LC_URL:          sw00411412000msb.lc
SUN_POSTN:       320.10d {+21h 20m 23s}  -15.54d {-15d 32' 28"}
SUN_DIST:         90.90 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.87d {+15h 23m 28s}  -23.19d {-23d 11' 39"}
MOON_DIST:       169.46 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.88,-37.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       48.41, -4.31 [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 a rate 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 = 26.27,-9.06 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:34:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.152d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 17"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48683.41 SOD {13:31:23.41} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.304
N_STARS:         21
X_OFFSET:        320 [pixels]
Y_OFFSET:        692 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1651 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00411412000msufc0078.fits
SUN_POSTN:       320.10d {+21h 20m 23s}  -15.54d {-15d 32' 27"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.88d {+15h 23m 30s}  -23.20d {-23d 11' 44"}
MOON_DIST:       169.44 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:35:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.152d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 17"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48683.41 SOD {13:31:23.41} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.304
N_STARS:         21
X_OFFSET:        320 [pixels]
Y_OFFSET:        692 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1651 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00411412000msufc0078.fits
SUN_POSTN:       320.10d {+21h 20m 24s}  -15.54d {-15d 32' 27"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.88d {+15h 23m 31s}  -23.20d {-23d 11' 48"}
MOON_DIST:       169.43 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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 06 Feb 10 13:34:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.152d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 17"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48683.41 SOD {13:31:23.41} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.304
N_STARS:         21
X_OFFSET:        320 [pixels]
Y_OFFSET:        692 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1651 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00411412000msufc0078.fits
SUN_POSTN:       320.10d {+21h 20m 23s}  -15.54d {-15d 32' 27"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.88d {+15h 23m 30s}  -23.20d {-23d 11' 44"}
MOON_DIST:       169.44 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:36:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.152d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 17"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48683.41 SOD {13:31:23.41} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     287155888
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0084.fits
SUN_POSTN:       320.10d {+21h 20m 24s}  -15.54d {-15d 32' 26"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.89d {+15h 23m 33s}  -23.20d {-23d 11' 54"}
MOON_DIST:       169.43 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:36:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.152d {+03h 08m 37s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 17"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48683.41 SOD {13:31:23.41} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     287155888
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0084.fits
SUN_POSTN:       320.10d {+21h 20m 24s}  -15.54d {-15d 32' 26"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.89d {+15h 23m 34s}  -23.20d {-23d 11' 57"}
MOON_DIST:       169.43 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:38:10 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     411412,   Seg_Num: 0
GRB_RA:           47.1623d {+03h 08m 38.95s} (J2000),
                  47.3014d {+03h 09m 12.33s} (current),
                  46.4747d {+03h 05m 53.92s} (1950)
GRB_DEC:         +13.1588d {+13d 09' 31.6"} (J2000),
                 +13.1970d {+13d 11' 49.1"} (current),
                 +12.9683d {+12d 58' 05.8"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48687.00 SOD {13:31:27.00} UT,   81.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       320.10d {+21h 20m 24s}  -15.54d {-15d 32' 25"}
SUN_DIST:         90.88 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.91d {+15h 23m 38s}  -23.20d {-23d 12' 07"}
MOON_DIST:       169.43 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.88,-37.74 [deg] galactic lon,lat of the burst
ECL_COORDS:       48.40, -4.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:42:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.154d {+13d 09' 15"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48895.34 SOD {13:34:55.34} UT,   290.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.056
N_STARS:         29
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00411412000msufc0289.fits
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 22"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.95d {+15h 23m 47s}  -23.21d {-23d 12' 33"}
MOON_DIST:       169.40 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:42:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.154d {+13d 09' 15"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48895.34 SOD {13:34:55.34} UT,   290.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.056
N_STARS:         29
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00411412000msufc0289.fits
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 21"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.95d {+15h 23m 48s}  -23.21d {-23d 12' 36"}
MOON_DIST:       169.40 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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 06 Feb 10 13:42:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.154d {+13d 09' 15"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48895.34 SOD {13:34:55.34} UT,   290.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.056
N_STARS:         29
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00411412000msufc0289.fits
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 22"}
SUN_DIST:         90.87 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.95d {+15h 23m 47s}  -23.21d {-23d 12' 33"}
MOON_DIST:       169.40 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:43:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.154d {+13d 09' 15"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48895.34 SOD {13:34:55.34} UT,   290.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     287156100
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0295.fits
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 21"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.96d {+15h 23m 50s}  -23.21d {-23d 12' 42"}
MOON_DIST:       169.39 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:43:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     411412,   Seg_Num: 0
GRB_RA:           47.1617d {+03h 08m 38.80s} (J2000),
                  47.3008d {+03h 09m 12.18s} (current),
                  46.4741d {+03h 05m 53.77s} (1950)
GRB_DEC:         +13.1578d {+13d 09' 28.0"} (J2000),
                 +13.1960d {+13d 11' 45.5"} (current),
                 +12.9673d {+12d 58' 02.2"} (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:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48687.00 SOD {13:31:27.00} UT,   81.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 20"}
SUN_DIST:         90.88 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.96d {+15h 23m 50s}  -23.21d {-23d 12' 42"}
MOON_DIST:       169.40 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.88,-37.74 [deg] galactic lon,lat of the burst
ECL_COORDS:       48.40, -4.31 [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:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:44:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.154d {+13d 09' 15"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  48895.34 SOD {13:34:55.34} UT,   290.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     287156100
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0295.fits
SUN_POSTN:       320.10d {+21h 20m 25s}  -15.54d {-15d 32' 20"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      230.96d {+15h 23m 51s}  -23.21d {-23d 12' 45"}
MOON_DIST:       169.39 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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.

GCN Circular #10376
H. A. Krimm (CRESST/GSFC/USRA), W. H. Baumgartner (GSFC/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), M. H. Siegel (PSU), M. A. Stark (PSU), R. L. C. Starling (U Leicester), E. Troja (NASA/GSFC/ORAU), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 13:30:05 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100206A (trigger=411412). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 47.177, +13.168 which is
```
   RA(J2000) = 03h 08m 42s
   Dec(J2000) = +13d 10' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single strong peak with a duration of about .3 sec. The peak count rate was ~14766 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 13:31:20.0 UT, 74.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 47.1617, 13.1579 which is equivalent to:
```
   RA(J2000)  = 03h 08m 38.81s
   Dec(J2000) = +13d 09' 28.4"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 64 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.32e+21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 78 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.38.
Burst Advocate for this burst is H. A. Krimm (krimm AT milkyway.gsfc.nasa.gov). 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 06 Feb 10 13:49:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 16"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  49474.67 SOD {13:44:34.67} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.846
N_STARS:         43
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00411412000msufc0869.fits
SUN_POSTN:       320.11d {+21h 20m 26s}  -15.54d {-15d 32' 16"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      231.02d {+15h 24m 05s}  -23.22d {-23d 13' 23"}
MOON_DIST:       169.36 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:50:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 16"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  49474.67 SOD {13:44:34.67} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.846
N_STARS:         43
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00411412000msufc0869.fits
SUN_POSTN:       320.11d {+21h 20m 26s}  -15.54d {-15d 32' 15"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      231.02d {+15h 24m 06s}  -23.22d {-23d 13' 25"}
MOON_DIST:       169.36 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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 06 Feb 10 13:49:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 16"} (J2000)
POINT_ROLL:      254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  49474.67 SOD {13:44:34.67} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.846
N_STARS:         43
X_OFFSET:        80 [pixels]
Y_OFFSET:        452 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1891 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00411412000msufc0869.fits
SUN_POSTN:       320.11d {+21h 20m 26s}  -15.54d {-15d 32' 16"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      231.02d {+15h 24m 05s}  -23.22d {-23d 13' 23"}
MOON_DIST:       169.36 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:51:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 16"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  49474.67 SOD {13:44:34.67} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     287156680
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0875.fits
SUN_POSTN:       320.11d {+21h 20m 26s}  -15.54d {-15d 32' 14"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      231.03d {+15h 24m 08s}  -23.23d {-23d 13' 33"}
MOON_DIST:       169.36 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 06 Feb 10 13:52:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     411412,   Seg_Num: 0
POINT_RA:         47.151d {+03h 08m 36s} (J2000)
POINT_DEC:       +13.155d {+13d 09' 16"} (J2000)
ROLL:            254.224d
IMG_START_DATE:  15233 TJD;    37 DOY;   10/02/06
IMG_START_TIME:  49474.67 SOD {13:44:34.67} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     287156680
X_OFFSET:        639 [pixels]
Y_OFFSET:        1011 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       799
Y_GRB_POS:       1171
BINNING_INDEX:   1
IM_URL:          sw00411412000msuni0875.fits
SUN_POSTN:       320.11d {+21h 20m 26s}  -15.54d {-15d 32' 14"}
SUN_DIST:         90.86 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      231.04d {+15h 24m 09s}  -23.23d {-23d 13' 36"}
MOON_DIST:       169.35 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      166.87,-37.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       48.39, -4.31 [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.

GCN Circular #10377
A. A. Miller, D. A. Perley, J. S. Bloom, S. B. Cenko (UC Berkeley), and P. E. Nugent (LBNL) report:
We co-added 78 archival images from the DeepSky* project at Palomar Observatory covering the field of GRB 100206A (Krimm et al., GCN 10376). The images were obtained between 2004-2008 from the Palomar-Quest Consortium at the Oschin Schmidt telescope. The limiting magnitude of the stack is approximately R ~ 23 mag.
In the combined image we detect a faint (R = 21.7 +/- 0.3 mag relative to nearby USNO catalog stars) extended source, slightly outside the current XRT error circle to its northeast. The approximate (+/- 1") coordinates of the source are:
RA = 03:08:39.10, dec = +13:09:29.3 (J2000)
We suggest this as a potential host candidate of the short-hard burst and encourage spectroscopic follow-up.
* http://supernova.lbl.gov/~nugent/deepsky.html
GCN Circular #10378
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1262 s of XRT Photon Counting mode data and 1 UVOT images for GRB 100206A, 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 = 47.16225, +13.15708 which is equivalent to:
```
RA (J2000): 03h 08m 38.94s
Dec (J2000): +13d 09' 25.5"
```
with an uncertainty of 3.2 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 #10379
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100206A (trigger #411412) (Krimm, et al., GCN Circ. 10376). The BAT ground-calculated position is RA, Dec = 47.168, 13.175 deg which is
```
   RA(J2000)  =  03h 08m 40.3s 
   Dec(J2000) = +13d 10' 30.3" 
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%.
The mask-weighted light curves a single spike starting at ~T+0.0 and ending at ~T+0.2 sec. T90 (15-350 keV) is 0.12 +- 0.03 sec (estimated error including systematics).
The time-averaged spectrum from T-0.008 to T+0.124 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.63 +- 0.17. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.44 sec in the 15-150 keV band is 1.4 +- 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/411412/BA/
GCN Circular #10380
D. Bhattacharya, Vijay Mohan, A.N. Ramaprakash, Chaitanya Rajarshi (IUCAA) and Kuntal Misra (STScI)report:
We imaged the field of GRB100206A (Krimm et al. GCN 10376, Goad et al GCN 10378) using the 2-m telescope of the IUCAA Girawali Observatory. Four 15-min exposures in R-band were taken on 06 Feb 2010 starting at 15:46 UT. The stacked 1 hour exposure shows no optical transient to a limiting magnitude of R ~22. The extended source reported by Miller et al (GCN 10377) is however clearly detected.
GCN Circular #10381
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 13:30:05.39 UT on 06 February 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100206A (trigger 287155807 / 100206563) which was also detected by the SWIFT-BAT (Krimm et al. 2008, GCN 10376). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 44.7 degrees.
The Fermi Observatory executed a maneuver following this trigger and tracked the burst location for the next 5 hours, subject to Earth-angle constraints.
The GBM light curve shows a single bright peak with a duration (T90) of about 0.13 +/- 0.05 s (8-1000 keV). The time-averaged spectrum from T0-0.019 s to T0+0.109 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -0.18 (+/-0.13) and the cutoff energy, parameterized as Epeak, is 506 (+68/-53) keV (Castor C statistic of 569 for 479 d.o.f.)
The event fluence (8-1000 keV) in this time interval is (9.3 +/- 0.4)E-07 erg/cm^2. The 0.016-sec peak photon flux measured starting from T0-0.003 s in the 8-1000 keV band is 31 +/- 2 ph/s/cm^2.
A Band function fits the spectrum equally well (Castor C statistic of 565 for 478 d.o.f.) with Epeak= 439 (+73/-60) keV, alpha = -0.09 (+0.17/-0.15)and beta = -2.35 (+0.24/-0.43) .
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #10382
P.A. Evans and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift-XRT team:
We have analysed 1.3 ks of XRT data for GRB 100206A (Krimm et al. GCN Circ. 10376), from 82 s to 1.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 10378).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.9 (+0.9/-0.7).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.0 (+1.2, -0.9). The best-fitting absorption column is 3.5 (+5.3, -0.0) x 10^21 cm^-2, in excess of the Galactic value of 1.3 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.6 x 10^-11 (7.4 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.9, the count rate at T+24 hours will be 1.9 x 10^-7 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.9 x 10^-17 (4.7 x 10^-17) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00411412.
This circular is an official product of the Swift-XRT team.
GCN Circular #10384
S. Guziy, F. J. Aceituno and A. J. Castro-Tirado (IAA-CSIC Granada), on behalf of a larger collaboration, report:
Following the detection of the short-duration gamma-ray burst GRB 100206A by Swift/BAT (Krimm et al. GCN Circ. 10376), we have conducted follow-up observations with the 0.6m TELMA robotic telescope (+ clear filter) at the BOOTES-2 station in M=E1laga and with the 1.5m OSN telescope (+ I-band filter) at Observatorio de Sierra Nevada in Granada. No optical afterglow is detected within the Swift/XRT error box (Goad et al., GCN Circ. 10378). An upper limit of I =3D 21 is derived from a combined 9 x 150-s I-band im= age obtained starting at 18:40 UT (5.2 hr postburst), consistent with the nul= l result reported by Bhattacharya et al. (GCN Circ. 10380). The candidate host galaxy reported by Miller et al. (GCN Circ. 10377) is also detected at the edge of the error box.=94
This message can be quoted.
GCN Circular #10385
K.Noda, E.Sonoda, H.hayasi, K.Kono, N.Ohmori, A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB GRB090206A (Swift trigger 411412, GCN 10376, Krimm et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 13:31:14 UT, about 1 min after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position.
```
the upper limits are as follows:
--------------------------------------------------------------
Start(UT)	End(UT)	Num. of frames	Limit (mag.)
--------------------------------------------------------------
13:31:14	13:31:44	 1	14.1
13:31:14	14:26:55	29	17.4	
---------------------------------------------------------------
```
GCN Circular #10386
A.J. Levan (U. Warwick), N.R. Tanvir, K. Wiersema (U. Leicester) M. Niederste-Ostholt (Cambridge), D. Malesani, G. Leloudas (DARK/NBI) D. Xu (WIS & DARK/NBI) report for a larger collaboration:
"We observed the localization of GRB 100206A (Krimm et al. GCN 10376) with the WHT beginning at 20:33 UT, approximately 7 hours after the burst. Observations were obtained in the i and z bands with exposures of 2000 and 2400s respectively.
Inside the refined XRT error circle (Goad et al. GCN 10378), we detect a faint source in both the i and z-bands. The location of the source is:
```
RA(J2000) = 03:08:38.99
DEC(J2000) = 13:09:22.7
```
With an uncertainty of approximately 0.5" in each axis. We consider this to be a candidate afterglow of GRB 100206A, however cannot currently place any constraints on variability of the source.
Further observations are planned."
GCN Circular #10387
G. Leloudas (DARK/NBI), D. Xu (WIS and DARK/NBI), D. Malesani (DARK/ NBI), A. J. Levan (U. Warwick), P. Jakobsson (Univ. Iceland), A. A. Djupvik (NOT), report, on behalf of a larger collaboration:
We observed the field of GRB 100206A (Krimm et al., GCN 10376) with the NOT equipped with NOTCam.
Observations were carried out in the Ks-filter (6x9x60 s) starting at 20h24 UT, i.e. 6.9 hr after the GRB.
Inside the enhanced XRT position (Goad et al., GCN 10378) we do not detect any object down to a limiting magnitude > 19.7 (based on the nearby 2MASS star 03083760+1308461).
The extended object reported by Miller et al. (GCN 10377) is clearly detected at Ks ~ 16.4.
GCN Circular #10389
S. B. Cenko, J. S. Bloom, D. A. Perley, B. E. Cobb, A. N. Morgan, and A. A. Miller, Maryam Modjaz (UC Berkeley) and B. James (DARK) report on behalf of a larger collaboration:
We have obtained spectra of the likely host galaxy (Miller et al., GCN 10377) and afterglow (Levan et al., GCN 10386) of the short-hard GRB100206A (Krimm et al, GCN 10376) with the Low Resolution Imaging Spectrometer mounted on the 10-m Keck I telescope. Observations began at 06:17 UT on 7 February (~ 16.8 hours after the burst) and cover the wavelength range from approximately 3500 - 10000 A.
At the location of the candidate host galaxy, we detect a strongly red continuum consistent with the published photometry (Leloudas et al., GCN 10387). We detect strong, clearly resolved emission lines from H-alpha and [NII] at a redshift of z = 0.41. No other obvious lines are visible over spectral range in our preliminary reduction. The lack of H-beta, coupled with the red spectrum and colors, suggest a relatively dusty environment. At this redshift, the projected offset of ~ 6.8" from the candidate afterglow corresponds to a distance of ~ 35 kpc.
No obvious trace is visible at the location of the afterglow.
Observations and reduction are ongoing.
GCN Circular #10390
A. N. Morgan, B. E. Cobb, J. S. Bloom, S. B. Cenko, D. A. Perley, A. A. Miller, M. Modjaz, C. R. Klein (UC Berkeley), report:
We have imaged the field of the short-hard GRB 100206A (Krimm et al., GCN 10376) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2010-02-07 02:37:50 UT (~13.1 hours after the burst). The potential host galaxy (Miller et al., GCN 10377) is clearly detected in mosaics taken simultaneously in the J, H, and Ks filters (effective exposure time of 2293 seconds). The preliminary photometry yields:
```
exp(s)  filt    mag
==============================
2293    J       18.35 +/- 0.07
2293    H       17.55 +/- 0.08
2293    Ks      16.56 +/- 0.08
==============================
```
A preliminary estimate of the metallicity from the Halpha and [N II] line ratios suggest a super-solar metallicity (~1.5 solar metallicity, using Asplund 2009 for Solar oxygen abundance). At a redshift of z = 0.41 (Cenko et al., GCN 10389), and assuming a Lambda-CDM cosmology with H_0=74 km/s/Mpc, Omega_M=0.27 and Omega_Lambda=0.73, we calculate the distance modulus to be 41.65 mag, which implies a rest-frame H-band magnitude of about -25 mag. This extreme luminosity, coupled with what appears to be strong optical reddening (Cenko et al., GCN 10389) suggests that this galaxy is a luminous infrared galaxy (LIRG/ULIRG). While the physical connection to GRB 100206A has not been definitively established, the probability of a chance coincidence of such a galaxy with a SHB is low, providing an a posterori argument for a physical connection.
All magnitudes given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.
GCN Circular #10391
V.Yurkov, S.Sergienko Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zemnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, T.Kopytova, A. Popov Ural State University, Kourovka
K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok Irkutsk State University
MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru, 200 mm, FOV=8 square degrees (testing mode)) and Very Wide Field Camera (D=50 mm, 1000 square degrees, 11 Mpx, 36" per pix, mounted on telescope) located at Blagoveschensk was responted to the GRB 100206A (Swift BAT alert, TRIGGER_NUM: 411412, Krimm et al, GCN CIRC 10376) 73 sec after first Notice time and 90 s after the GRB time. Unfortunatelly, the main telescope camera was not operating due to technical problem at this time.
We have a number images with 5 s exposition from Very Wide Field Camera. The image limit from Very Wide Filed Camera ~11.5. trees) is available at http://observ.pereplet.ru/images/GRB100206A/grb100206A.png .
There is no OT brighter 11.5.
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #10392
J. Mao (YNAO & INAF-OAB), D. Wang and J. Bai (YNAO) report on behalf of the GMG group:
Starting 14h 44m UT, after more than 1 hour of the trigger, we observed the field of GRB 100206A (Krimm et al., GCN 10376) with one 2.4-m telescope located at Gao-Mei-Gu (GMG). We did not see the afterglow in the R-band image with exposure time 20 min. However, the nearby galaxy(Miller et al. GCN 10377) were clearly detected, the magnitude is about R ~ 21.5 referenced to one USNO star.
This message might be cited.
GCN Circular #10394
F.E. Marshall (NASA/GSFC) and H.A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100206A 78 s after the BAT trigger (Krimm et al., GCN Circ. 10376). No optical afterglow consistent with the refined XRT position (Goad et al., GCN Circ. 10378) or the candidate optical afterglow position (Levan et al., GCN Circ. 10386) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            78          228          147         >20.5
u_FC               290          540          246         >20.1
white               78         7046          647         >21.4
v                  619         7457          553         >20.1
b                  545        13655         1223         >21.2
u                  290        12756         1464         >20.5
w1                 668         7866          510         >20.7
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.38 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #10395
E. Berger, R. Chornock (Harvard), N. Tanvir (U. Leicester), A.J. Levan (U. Warwick), D. Fox, A. Cucchiara (PSU), A. Fruchter and J. Graham (STScI) report on behalf of a larger collaboration:
"We observed the field of the short GRB 100206A (GCN #10376) with GMOS on the Gemini-North 8-m telescope starting on 2010 Feb 7.215 (15.7 hours after the burst). Observations were obtained in the i- and z-band filters for a total of 1200 sec in each filter. Inside the refined XRT error circle (GCN #10378) we detect the candidate optical afterglow detected with the WHT (GCN #10386). Within the photometric uncertainties the source does not appear to fade in either filter between the two observation (7 and 15.7 hours) and it is thus unlikely to be the optical afterglow. However, since the source is located within the XRT error circle we consider it to be a potential host galaxy, likely at a higher redshift than the bright galaxy at z=0.41 located just outside the error circle (GCN #10389)."
GCN Circular #10396
A. Nicuesa (Tautenburg Obs.), T. Kruehler (MPE), S. Klose (Tautenburg Obs.) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 100206A (Swift trigger #411412; Krimm et al., GCN #10376) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at LaSilla Observatory (Chile).
Observations started on 7 February 2010 at 00:31 UT, 11 hours after the GRB trigger, and were performed at high airmass and poor seeing conditions.
In stacked images with a total integration time of 40 minutes in JHK and 50 minutes in g'r'i'z' we do not detect the object reported by Levan et al. (GCN #10386) and Berger et al. (GCN #10395) down to the following limits, all in the AB system:
```
g' > 23.2,
r' > 23.4,
i' > 22.4,
z' > 22.2,
J > 21.2 ,
H > 20.7 and
K > 20.0
```
These upper limits have been obtained using the GROND zeropoints and 2MASS field stars as reference. The nearby object (Miller et al., GCN#10377, Bhattacharya et al., GCN#10380, Guziy et al., GCN#10384, Leloudas et al., GCN#10387, Cenko et al., GCN# 10389, Morgan et al., GCN#10390, Mao et al. #10392) is detected in all seven bands.
GCN Circular #10410
E. Berger and R. Chornock (Harvard) report on behalf of a larger collaboration:
"We obtained a second epoch of i-band imaging of the short GRB 100206A (GCN 10376) with GMOS on the Gemini-North 8-m telescope starting on 2010 Feb 12.28 UT. Digital image subtraction of the new observation relative to our previous i-band epoch from 2010 Feb 7.23 UT (GCN 10395) using the ISIS software package does not reveal any fading sources to a 3-sigma limit of i>24.7 mag within the XRT error circle (GCN 10378), in coincidence with the nearby bright galaxy at z=0.41 (GCN 10389), or in coincidence with the nearby fainter galaxy (GCNs 10386,10395). We therefore place a limit of i>24.7 mag on the brightness of the optical afterglow at 15.7 hours after the burst."
GCN Report 271.1
GCN_Report 271.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_271_1.pdf by H.A. Krimm at CRESST/GSFC/USRA titled: "Final Swift Observations of GRB 100206A"
GCN Circular #10455
M.Andreev, A.Sergeev, N.Parakhin, N.Karpov (Terskol Branch of Institute of Astronomy), Yu. Kuznietsova (Main Astronomical Observatory NASU), V.Petkov (Baksan Neutrino Observatory INR) and A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the field of the Swift GRB 100206A (Krimm et al. GCN 10376) with the Z-600 telescope of Mt.Terskol observatory in R-filter on Feb. 06 starting at (UT) 15:49. We obtained three series under variable weather conditions and improving seeing.
The upper limits of point like object in combined images of each series are presented below. The photometry is based on the USNO-B1.0 reference stars 1032-0043920 (assuming R2=15.76) and 1031-0041081 (R2=15.78):
```
T0+     Filter, Exposure, mag.
(mid, d)             (s)

0.1034    R  10x120   >20.5
0.1235    R  20x120   >20.8
0.1631    R  20x120   >21.4
```
The nearby galaxy (Miller et al., GCN 10377, Bhattacharya et al., GCN 10380, Guziy et al., GCN 10384, Leloudas et al., GCN 10387, Cenko et al., GCN 10389, Morgan et al., GCN 10390, Mao et al. GCN 10392, Nicuesa et al. GCN 10396) is detected in last series in coordinates (J2000) RA=03 08 39.17 Dec=+13 09 28.7 +/-0.5" and magnitude R=21.3 +/-0.3. No objects is detected in enhanced XRT error circle (Goad et al. GCN 10378).
GCN Circular #10456
V. Rumyantsev, D. Shakhovkoy (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 100206A (Krimm et al. GCN 10376) with AZT-11 telescope of CrAO between (UT) Feb. 06 16:09 -- 17:10 under poor seeing of about 6 arcsec. No objects is detected in enhanced XRT error circle (Goad et al. GCN 10378).
The upper limit of point like object in a stacked image based on USNO-B1.0 star 1031-0041090 (assuming R2=16.63) is following:
```
T0+      Filter,   Exposure, mag.
(mid, d)              (s)

0.1315   R       20x180    > 21.7
```
1112.3963 from 20 Dec 11
Daniel A. Perley et al.: The Luminous Infrared Host Galaxy of Short-Duration GRB 100206A
The known host galaxies of short-hard gamma-ray bursts (GRBs) to date are characterized by low to moderate star-formation rates and a broad range of stellar masses. In this paper, we positionally associate the recent unambiguously short-hard Swift GRB 100206A with a disk galaxy at redshift z=0.4068 that is rapidly forming stars at a rate of ~30 M_sun/yr, almost an order of magnitude higher than any previously identified short GRB host. Using photometry from Gemini, Keck, PAIRITEL, and WISE, we show that the galaxy is very red (g-K = 4.3 AB mag), heavily obscured (A_V ~ 2 mag), and has the highest metallicity of any GRB host to date (12 + log[O/H]_KD02 = 9.2): it is a classical luminous infrared galaxy (LIRG), with L_IR ~ 4 x 10^11 L_sun. While these properties could be interpreted to support an association of this GRB with very recent star formation, modeling of the broadband spectral energy distribution also indicates that a substantial stellar mass of mostly older stars is present. The current specific star-formation rate is modest (specific SFR ~ 0.5 Gyr^-1), the current star-formation rate is not substantially elevated above its long-term average, and the host morphology shows no sign of recent merger activity. Our observations are therefore equally consistent with an older progenitor, similar to what is inferred for other short-hard GRBs. Given the precedent established by previous short GRB hosts and the significant fraction of the Universe's stellar mass in LIRG-like systems at z >~0.3, an older progenitor represents the most likely origin of this event.

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Jochen Greiner, last update: 20-Dec-2011 [Disclaimer]