Gamma-ray Burst 060801

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:16:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     222154,   Seg_Num: 0
GRB_RA:          213.025d {+14h 12m 06s} (J2000),
                 213.103d {+14h 12m 25s} (current),
                 212.430d {+14h 09m 43s} (1950)
GRB_DEC:         +16.984d {+16d 59' 03"} (J2000),
                 +16.953d {+16d 57' 12"} (current),
                 +17.218d {+17d 13' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3426 [cnts]    Image_Peak=204 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   483     E_range: 50-350 keV
BKG_INTEN:       31902 [cnts]
BKG_TIME:        44158.64 SOD {12:15:58.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        13948 TJD;   213 DOY;   06/08/01
GRB_TIME:        44175.15 SOD {12:16:15.15} UT
GRB_PHI:         150.33 [deg]
GRB_THETA:         9.06 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     30.03 [sigma]
IMAGE_SIGNIF:    9.35 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +3 +11  +0  +0 -22  +1 
SUN_POSTN:       131.55d {+08h 46m 12s}  +17.98d {+17d 58' 31"}
SUN_DIST:         77.08 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.38d {+13h 45m 32s}  -14.00d {-14d 00' 00"}
MOON_DIST:        31.66 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      204.30, 28.38 [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 = 83.17,0.53 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:18:34 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.019d {+14h 12m 05s} (J2000)
POINT_DEC:       +16.986d {+16d 59' 10"} (J2000)
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44238.16 SOD {12:17:18.16} UT,   63.0 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Tue 01 Aug 06 12:20:40 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.019d {+14h 12m 05s} (J2000)
POINT_DEC:       +16.986d {+16d 59' 10"} (J2000)
POINT_ROLL:      285.099d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44242.31 SOD {12:17:22.31} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.570
N_STARS:         13
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0067.fits
SUN_POSTN:       131.55d {+08h 46m 13s}  +17.97d {+17d 58' 28"}
SUN_DIST:         77.07 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.41d {+13h 45m 39s}  -14.01d {-14d 00' 52"}
MOON_DIST:        31.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.55, 68.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:23:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.019d {+14h 12m 05s} (J2000)
POINT_DEC:       +16.986d {+16d 59' 10"} (J2000)
ROLL:            285.099d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44242.31 SOD {12:17:22.31} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     176127443
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0067.fits
SUN_POSTN:       131.56d {+08h 46m 13s}  +17.97d {+17d 58' 27"}
SUN_DIST:         77.07 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.43d {+13h 45m 44s}  -14.02d {-14d 01' 25"}
MOON_DIST:        31.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.55, 68.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:23:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.019d {+14h 12m 05s} (J2000)
POINT_DEC:       +16.986d {+16d 59' 10"} (J2000)
POINT_ROLL:      285.099d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44242.31 SOD {12:17:22.31} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.570
N_STARS:         13
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0067.fits
SUN_POSTN:       131.56d {+08h 46m 13s}  +17.97d {+17d 58' 26"}
SUN_DIST:         77.07 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.44d {+13h 45m 45s}  -14.03d {-14d 01' 31"}
MOON_DIST:        31.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.55, 68.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:27:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 18"} (J2000)
POINT_ROLL:      285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44347.96 SOD {12:19:07.96} UT,   172.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.564
N_STARS:         34
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0172.fits
SUN_POSTN:       131.56d {+08h 46m 14s}  +17.97d {+17d 58' 24"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.47d {+13h 45m 52s}  -14.04d {-14d 02' 19"}
MOON_DIST:        31.68 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:28:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 18"} (J2000)
POINT_ROLL:      285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44347.96 SOD {12:19:07.96} UT,   172.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.564
N_STARS:         34
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0172.fits
SUN_POSTN:       131.56d {+08h 46m 14s}  +17.97d {+17d 58' 23"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.48d {+13h 45m 54s}  -14.04d {-14d 02' 32"}
MOON_DIST:        31.68 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:28:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 18"} (J2000)
ROLL:            285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44347.96 SOD {12:19:07.96} UT,   172.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     176127549
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0172.fits
SUN_POSTN:       131.56d {+08h 46m 14s}  +17.97d {+17d 58' 23"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.48d {+13h 45m 54s}  -14.04d {-14d 02' 35"}
MOON_DIST:        31.68 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:30:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 18"} (J2000)
ROLL:            285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44347.96 SOD {12:19:07.96} UT,   172.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     176127549
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0172.fits
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 22"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.49d {+13h 45m 57s}  -14.05d {-14d 02' 55"}
MOON_DIST:        31.69 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:32:34 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     222154,   Seg_Num: 0
GRB_RA:          213.0064d {+14h 12m 01.5s} (J2000),
                 213.0846d {+14h 12m 20.3s} (current),
                 212.4122d {+14h 09m 38.9s} (1950)
GRB_DEC:         +16.9819d {+16d 58' 54.8"} (J2000),
                 +16.9512d {+16d 57' 04.2"} (current),
                 +17.2162d {+17d 12' 58.1"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44238.16 SOD {12:17:18.16} UT,   63.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 21"}
SUN_DIST:         77.05 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.51d {+13h 46m 02s}  -14.06d {-14d 03' 24"}
MOON_DIST:        31.68 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.52, 68.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      204.28, 28.37 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:32:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
POINT_ROLL:      285.101d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45052.86 SOD {12:30:52.86} UT,   877.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.652
N_STARS:         15
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0877.fits
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 21"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.51d {+13h 46m 02s}  -14.06d {-14d 03' 28"}
MOON_DIST:        31.69 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:21:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     222154,   Seg_Num: 0
GRB_RA:          213.025d {+14h 12m 06s} (J2000),
                 213.103d {+14h 12m 25s} (current),
                 212.430d {+14h 09m 43s} (1950)
GRB_DEC:         +16.984d {+16d 59' 03"} (J2000),
                 +16.953d {+16d 57' 12"} (current),
                 +17.218d {+17d 13' 06"} (1950)
GRB_DATE:        13948 TJD;   213 DOY;   06/08/01
GRB_TIME:        44175.15 SOD {12:16:15.15} UT
TRIGGER_INDEX:   483
GRB_PHI:         150.33 [deg]
GRB_THETA:         9.06 [deg]
DELTA_TIME:      -50.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     30.03 [sigma]
IMAGE_SIGNIF:    9.35 [sigma]
LC_URL:          sw00222154000msb.lc
SUN_POSTN:       131.55d {+08h 46m 13s}  +17.97d {+17d 58' 28"}
SUN_DIST:         77.07 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.42d {+13h 45m 41s}  -14.02d {-14d 01' 04"}
MOON_DIST:        31.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      204.30, 28.38 [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 = 83.17,0.53 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:33:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
ROLL:            285.101d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45052.86 SOD {12:30:52.86} UT,   877.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     176128254
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0877.fits
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 20"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.52d {+13h 46m 04s}  -14.06d {-14d 03' 38"}
MOON_DIST:        31.69 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:21:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.019d {+14h 12m 05s} (J2000)
POINT_DEC:       +16.986d {+16d 59' 10"} (J2000)
ROLL:            285.099d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  44242.31 SOD {12:17:22.31} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     176127443
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0067.fits
SUN_POSTN:       131.55d {+08h 46m 13s}  +17.97d {+17d 58' 28"}
SUN_DIST:         77.07 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.42d {+13h 45m 40s}  -14.02d {-14d 00' 58"}
MOON_DIST:        31.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.55, 68.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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 Circular #5378
J. L. Racusin (PSU), L. M. Barbier (NASA/GSFC), P. J. Brown (PSU), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and E. Troja (INAF-IASFPA) report on behalf of the Swift Team:
At 12:16:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060801 (trigger=222154). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 213.025, +16.984 {14h 12m 06s, +16d 59' 03"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a short burst with a duration of about 0.5 sec. The peak count rate was ~6000 counts/sec (15-350 keV), at ~0.5 sec after the trigger.
The XRT began taking data at 12:17:18 UT, 63 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image but ground processed data reveals an uncatalogued fading point source at the following location: RA(J2000): 14h 12m 01.5s, Dec(J2000): +16d 58m 55.1s with an estimated error of 3.8 arcseconds radius (90% containment).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 67 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18.5 mag. Data for the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:39:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
POINT_ROLL:      285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45158.55 SOD {12:32:38.55} UT,   983.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.605
N_STARS:         25
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0983.fits
SUN_POSTN:       131.57d {+08h 46m 16s}  +17.97d {+17d 58' 16"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.56d {+13h 46m 15s}  -14.08d {-14d 04' 55"}
MOON_DIST:        31.70 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:40:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
POINT_ROLL:      285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45158.55 SOD {12:32:38.55} UT,   983.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.605
N_STARS:         25
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0983.fits
SUN_POSTN:       131.57d {+08h 46m 16s}  +17.97d {+17d 58' 16"}
SUN_DIST:         77.05 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.57d {+13h 46m 17s}  -14.09d {-14d 05' 08"}
MOON_DIST:        31.71 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:40:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
ROLL:            285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45158.55 SOD {12:32:38.55} UT,   983.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     176128359
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0983.fits
SUN_POSTN:       131.57d {+08h 46m 16s}  +17.97d {+17d 58' 15"}
SUN_DIST:         77.05 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.57d {+13h 46m 17s}  -14.09d {-14d 05' 11"}
MOON_DIST:        31.71 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:     Tue 01 Aug 06 12:42:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
ROLL:            285.100d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45158.55 SOD {12:32:38.55} UT,   983.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     176128359
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0983.fits
SUN_POSTN:       131.57d {+08h 46m 16s}  +17.97d {+17d 58' 15"}
SUN_DIST:         77.05 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.58d {+13h 46m 20s}  -14.09d {-14d 05' 28"}
MOON_DIST:        31.71 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:35:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
ROLL:            285.101d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45052.86 SOD {12:30:52.86} UT,   877.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     176128254
X_OFFSET:        742 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       902
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00222154000msuni0877.fits
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 19"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.53d {+13h 46m 07s}  -14.07d {-14d 04' 00"}
MOON_DIST:        31.70 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Aug 06 12:35:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     222154,   Seg_Num: 0
POINT_RA:        213.018d {+14h 12m 04s} (J2000)
POINT_DEC:       +16.988d {+16d 59' 19"} (J2000)
POINT_ROLL:      285.101d
IMG_START_DATE:  13948 TJD;   213 DOY;   06/08/01
IMG_START_TIME:  45052.86 SOD {12:30:52.86} UT,   877.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.652
N_STARS:         15
X_OFFSET:        423 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1382 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00222154000msufc0877.fits
SUN_POSTN:       131.56d {+08h 46m 15s}  +17.97d {+17d 58' 19"}
SUN_DIST:         77.06 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      206.53d {+13h 46m 06s}  -14.07d {-14d 03' 56"}
MOON_DIST:        31.69 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:        8.56, 68.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.29, 28.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #5379
S.Okuno, D.Yonetoku, T.Murakami, H.Kodaira, S.Yoshinari, T.Kidamura, S.Tanabe, S.Yokota, Y.Aoyama, R.Kozaka, Y.Kodama report on behalf of the Kanazawa GRB team:
We have imaged the field of GRB 060801 (J. L. Racusin et al. GCN 5378) in R band with 0.3m telescope at Kanazawa Japan. The automated system took the first image at 300 s after the trigger (under poor conditions). Compared with the USNO-A2.0 catalog, no new source was detected brighter than the limiting magnitude of R>15.9 mag in the XRT error circle. Further analysis is in progress.
GCN Circular #5380
E.Sonoda, S.Maeno, M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB 060801 (GCN 5378) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 12:17:47 UT on Aug. 1.
We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, there is no new source at the position reported by GCN 5378.
The upper limits are as follows:
```
--------------------------------------------------------------
Start(UT)	End(UT)	    Num. of frames	Limit (mag.)	
--------------------------------------------------------------
12:17:47	12:18:17	1		~14.5
12:21:23	12:33:37	12		~17.1
12:37:12	12:53:03	14		~17.0
---------------------------------------------------------------
```
GCN Circular #5381
G. Sato (GSFC/ISAS), L. Barbier (GSFC), S.D. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060801 (trigger #222154) (Racusin, et al., GCN Circ. 5378). The BAT ground-calculated position is RA,Dec = 212.987, 16.988 deg {14h 11m 56.9s, 16d 59' 17.4"} (J2000) +- 1.8 arcmin, (radius, sys+stat, 90% containment). This burst was in the fully-coded field-of-view.
The mask-weighted lightcurve shows two overlapping peaks. The first, and brighter of the two, starts at T+0.0 sec and peaks at ~T+0.06 sec. The second peaks at ~T+0.50 sec and ends at ~T+0.7 sec. At the ~2-sigma level, there is a possible short peak at ~T+1.3 sec. T90 (15-350 keV) is 0.5 +- 0.1 sec (estimated error including systematics). There is no obvious emission, soft or otherwise, in the T+10 to T+200 sec time range.
The time-averaged spectrum from T+0.0 to T+0.6 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.47 +- 0.24. The fluence in the 15-150 keV band is 8.1 +- 1.0 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.18 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The lag for this burst is -0.008 +/- 0.008 sec, between the 25-50 keV and 100-350 keV bands.
GCN Circular #5382
J. L. Racusin, D. Grupe, D. Morris, and M. Stroh report on behalf of the Swift XRT team:
We have analysed the first 2 orbits of XRT data from the short hard GRB 060801 (Racusin et al., GCN Circ. 5378), with a total exposure of 3.7 ks in Photon Counting mode. The refined XRT position is:
```
RA(J2000)  = 14h 12m 01.6s
Dec(J2000) = +16d 58m 54.8s
```
with an uncertainty of 3.7 arcsec (90% containment). This position is 1.8 arcsec away from the XRT position quoted in Racusin et al. (GCN Circ. 5378), and 71 arcsec away from the refined BAT position (Sato, et al., GCN Circ. 5381).
The 0.3-10 keV X-ray light curve shows a plateau from 73s until ~115s after the BAT trigger, followed by a decay with a power law index of -1.19 +/- 0.16 until a break at ~400s to a steeper decay with a power law index of -5.84 +/- 3.3. The X-ray afterglow is not detected in the second orbit.
A power-law fit to the 0.3-10 keV spectrum from the first orbit gives a photon index of 1.67+/-0.20 and a column density of (0.8+/-0.5)e21 cm**-2. We note the Galactic hydrogen column density in the direction of the burst is 1.51e20cm**-2.
This circular is an official product of the Swift XRT Team.
GCN Circular #5383
S. Duscha, G. Kanbach, M. Muehlegger, A. Stefanescu, F. Schrey, N. Prymak, H. Steinle (MPE Garching) of the OPTIMA-Burst team report from the 1.3m Skinakas Observatory (University of Crete, Heraklion, Greece):
We observed the position of the XRT errorcircle of GRB 060801 (trigger #222154, Racusin, et al., GCN Circ. 5378) on 2006 Aug 01, 19:24 UT (mid-exposure; about 7 hours post burst): in a 20 min R-filter exposure we do not detect a counterpart candidate brighter than R=22.
GCN Circular #5384
A. J. Castro-Tirado (IAA-CSIC Granada), G. C. Anupama, S. Srividya, Ramya (IIAP-RES Bangalore), A. de Ugarte Postigo (IAA-CSIC), S. Sanchez, L. Montoya (CAHA Almeria), A. Castillo, J. F. Mu=F1oz-Mateos (Univ. Complutense Madrid), M. Jel=EDnek and J. Gorosabel (IAA-CSIC),
report:
"Following the detection by SWIFT of the short GRB 060801 (Racusin et al. GCNC 5378, Sato et al. GCN 5381), we have taken R-band frames at the 2.0m Hanle telescope in India (+HFOSC) starting on Aug 1.75 UT. Additional BVR-band frames have been taken with the auxiliary port camera at the 3.5m telescope at the German-Spanish Calar Alto Observatory in south Spain, starting on Aug 1.935 UT. Near the position of the X-ray afterglow (Racusin et al. GCN 5382), we detect two faint optical sources in the R-band images:
source A: 14 12 01.8 +16 59 00.5
source B: 14 12 01.3 +16 58 54.0
with 1" accuracy (for the time being).
source A is at the edge of the XRT error box and brighter than source B and it seems to be constant in brightness over the time interval of our observations. Source B is consistent with the XRT error box and there is marginal evidence that source B has declined in brightness, with R = 22.5 +/- 0.5 (preliminary) in the 3.5m CAHA images. Further analysis is in progress."
This message can be quoted.
GCN Circular #5385
P. J. Brown & J. L. Racusin (PSU) report on behalf of the Swift/UVOT team:
The Swift UVOT began taking settled exposures on the field of the short hard GRB060801 (BAT Trigger #222154), 67 s after the BAT trigger (Racusin et al., GCN Circ. 5378). No new source, relative to the DSS, is seen inside the refined XRT error circle (Racusin et al., GCN Circ. 5382) or at the positions of the optical sources reported by Castro-Tirado et al. (GCN Circ. 5384). The 3-sigma upper limits for the first finding charts and the coadded images are listed below.
Finding charts:
```
Filter  T_range(s)    Exposure (s)    3-sigma UL
White   67-166        100             19.9
V       173-572       400             19.5
```
Coadded images:
```
Filter  T_range(s)    Exposure (s)    3-sigma UL
White   67-7181       461             20.8
V       173-6309      1023            20.1
B       651-7127      412             20.6
U       627-6922      432             20.3
UVW1    603-6718      432             20.3
UVM2    579-6513      245             20.2
UVW2    679-6104      236             20.4
```
T_range is calculated from the time of the burst. These upper limits have not been corrected for the estimated Galactic reddening of E_(B-V) = 0.018 mag (Schlegel et al. 1998).
GCN Circular #5386
S. Piranomonte (INAF, OAR), S. Covino (INAF, OABr), D. Malesani (SISSA/ISAS), G.Tagliaferri (INAF, OABr), G. Chincarini (Univ Milano-Bicocca), L. Stella (INAF, OARm), report on behalf of the MISTICI collaboration:
We observed the position of XRT error circle of GRB 060801 (Racusin, et al., GCN Circ. 5378) with FORS2/VLT on August 2.0125 UT (about 12 hours post burst). Eight exposures lasting 300s were acquired with the FORS2 instrument.
Preliminary analysis shows that the objects from Castro-Tirado et al. (GCN 5384) are clearly evident (A: 14:12:01.65,+16:59:02.0 and B: 14:12:01.21, +16:58:55.7) with R magnitudes about 20.8 and 22.6, respectively. Object B seems to have a possible extended emission.
Inside the XRT errorbox we find two more ojects. One near the limit of the error box (C: 14:12:01.88, 16:58:53.7 with R mag about 22.6) and one faint, possible extended object (object D: 14:12:01.40,+16:58:54.7) with R magnitude about 23.6. Objects B is distant 3-3.5 arcsec from object D.
Magnitudes were calibrated with the USNO catalogue and absolute uncertainty is likely of the order of 0.5 magnitudes.
At the present stage, therefore, no object can be easily singled out as the GRB afterglow, although source B and D could be the GRB host galaxy.
Further analysis are on-going We thank the ESO staff for excellently performing these observations in service mode.
This message may be cited"

"We observed the position of XRT error circle of GRB 060801 (Racusin, et al., GCN Circ. 5378) with FORS2/VLT on August 2.0125 UT (about 12 hours post burst). Eight exposures lasting 300s were acquired with the FORS2 instrument. Preliminary analysis shows that the objects from Castro-Tirado et al. (GCN 5384) are clearly evident (A: 14:12:01.65,+16:59:02.0 and B: 14:12:01.21,+16:58:55.7) with R magnitudes about 20.8 and 22.6, respectively. Object B appear to have a possible extended emission.
Inside the XRT errorbox we find two ojects. One near the limit of the error box (C: 14:12:01.88, 16:58:53.7 with R mag about 22.6) and one faint, possible extended object (object D: 14:12:01.40,+16:58:54.7) with R magnitude about 23.6.
Objects B is distant 3.5 arcsec from object D.
Magnitudes were calibrated with the USNO catalogue and absolute uncertainty is likely of the order of 0.5 magnitudes.
At the present stage, therefore, no object can be easily singled out as the GRB afterglow, although source D could be the GRB host galaxy.
Further analysis are on-going.
We thank the ESO staff for excellently performing these observations in service mode.
This message may be cited"
GCN Circular #5388
A. M. Soderberg (Caltech), D. A. Frail (NRAO) and P. Chandra (UVA/NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We observed the field centered on the XRT position of the Swift burst GRB 060801 (GCN#5378) using the VLA at a frequency of 8.46 GHz, beginning at August 2.00 UT. We detect no sources within the XRT error circle and place a 3-sigma limit of 105 uJy. Further observations are planned.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #5389
N. Butler (UC Berkeley) reports:
We detect 12 X-ray sources with signal-to-noise ratio >3 with wavdetect in the 25.3 ksec exposure XRT image of the short GRB 060108 field (Racusin et al. 2006; GCN 5378). Six position matches with optical sources in SDSS DR5 (see, sdss.org) give the following sizable frame shift:
dRA -4.29", dDec -0.70"; +/-0.73" (90% conf.)
and the refined position:
RA, Dec: 14 12 01.30 +16 58 54.4; +/- 1.1" (J2000, 90% conf.)
Our refined position is marginally consistent with the refined position of the XRT team (Racusin et al. 2006; GCN 5382). The position is fully consistent with that of optical source B and marginally consistent with that of optical source D (Castro-Tirado et al. 2006; GCN 5384; Piranomonte et al. 2006; GCN 5386). It is inconsistent with the source A and C positions.
GCN Circular #5390
A.J. van der Horst (University of Amsterdam) reports on behalf of a larger collaboration:
"We observed the position of the GRB 060801 afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope on Aug 2 from 11.03 to 23.01 UT, i.e. 0.95 - 1.45 days after the burst (GCN 5378). We do not detect a radio source within the XRT error circle (GCN 5382) or the refined XRT/SDSS error circle (GCN 5389), in particular at the position of the optical sources mentioned in GCN 5384 and GCN 5386. The rms noise in het map within the SWIFT/XRT error circle is 24 microJy per beam. The formal flux measurement for a point source at the center of the XRT error circle is 32 +/- 24 microJy.
We detect two sources close to the XRT error circle which are also present in the FIRST survey at 1.4 GHz. These sources have fluxes of 854 +/- 37 microJy (RA(J2000)=14h12m00.39s, Dec(J2000)=16d59m05.3s) and 1031 +/- 37 microJy (RA(J2000)=14h12m01.18s, Dec(J2000)=16d59m06.7s) at 4.9 Ghz."
GCN Circular #5392
S. Piranomonte (INAF-OARm), S. Covino (INAF-OABr), D. Malesani (SISSA/ISAS), G. Tagliaferri (INAF/OABr), G. Chincarini (Univ. Milano-Bicocca), and L. Stella (INAF-OARm) report on behalf of the MISTICI collaboration:
We observed again the field of GRB 060801 (Racusin et al., GCN 5378, 5382; Sato et al., GCN5381) with the ESO VLT equipped with the FORS2 instrument. Standard star fields were observed in order to get a reliable flux calibration. We find a significant mismatch (more than 1 mag) with respect to the USNO calibration. Adopting the naming introduced by Castro-Tirado et al. (GCN 5384) and Piranomonte et al. (GCN 5386), we find the following magnitudes for the four sources close to the XRT position:
```
 A: R = 21.95
 B: R = 23.71 (extended)
 C: R = 23.90
 D: R = 24.62 (extended)
```
Between the night of Aug 1 (mean time Aug 2.026 UT) and Aug 2 (mean time Aug 2.991 UT) we find no variability of any of the above sources up to ~0.1 mag.
We acknowledge the excellent support from the ESO staff, in particular Oliver Hainaut.
This message can be cited.
GCN Circular #5408
A.J. van der Horst (University of Amsterdam) reports on behalf of a larger collaboration:
"We reobserved the position of the GRB 060801 afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope on Aug 6 from 10.77 to 22.75 UT, i.e. 4.94 - 5.44 days after the burst (GCN 5378). We do not detect a radio source within the XRT error circle (GCN 5382) or the refined XRT/SDSS error circle (GCN 5389). The rms noise in het map within the XRT error circle is 27 microJy per beam. The formal flux measurement for a point source at the center of the XRT error circle is 51 +/- 27 microJy."
GCN Circular #5470
A. Cucchiara (PSU), D. B. Fox (PSU), E. Berger (OCIW) and P. A. Price (IfA,UH) report:
Starting at August, 22nd at 06:05:49 UT, we obtained 2x900 sec spectra of the candidate host galaxy of GRB 060801 (extended source B in GCN5389) using Gemini North observatory and GMOS spectrograph with 1 arcsec slit and R400 grating.
We detect a bright emission line at 7942A, with no other apparent features. Identifying this line as [OII] at 3727A yields a redshift of z = 1.131 for this galaxy. At this redshift, the observed fluence of 8.1e-8 erg/cm2 (GCN 5381) corresponds to an isotropic-equivalent energy of 2.7e50 erg.
We thank the staff at Gemini for performing the observations.
GCN Circular #5773
J. L. Racusin, D. N. Burrows (PSU), and N. Gehrels (NASA/GSFC) report on behalf of the Swift XRT team:
We have re-analyzed the full XRT data set of the short hard GRB 060801. XRT observed the field of GRB 060801 for a total of 75 ks between August 1 and August 5, 2006 in Photon Counting mode in order to obtain a more accurate position of the short-lived X-ray afterglow.
In the full data set we find 23 serendipitous X-ray sources detected with the XIMAGE detect algorithm with S/N > 3, 12 of which have near-by optical counterparts in the SDSS. We match these sources to obtain a best fit mean frame shift, carefully accounting for several instrumental factors described below.
At the time of these observations there was a problem with the bias maps that caused spurious hot pixels to remain in the cleaned event lists after standard processing. To remove this contamination, we filtered out events with energies < 0.4 keV. For more information on the bias map issue, see http://www.swift.ac.uk/xrtdigest.shtml.
We also apply an exposure map correction to the images before input into XRTCENTROID to account for any sources landing on or near the bad columns in the XRT CCD. In the first orbit, the GRB did in fact lie on one of these columns. We use XRTCENTROID to calculate the positions of the GRB and the serendipitous sources.
Additional position error arises from the Swift star tracker solution uncertainty. This error is small once the spacecraft has completely settled after a slew, but is not achieved until ~100s after the XRT observations begin. Therefore, we exclude the first 100s of each orbit, reducing the total used exposure used time to 69 ks.
We calculate the statistical position errors using the empirical fits as described in Moretti et al. (2006, A&A, 448, L9), assuming that the astrometric correction removes the 3.5" systematic error normally applied to XRT positions to account for errors in the star tracker attitude solution.
The result of this analysis leads to a mean frame shift from the previously reported position (Racusin et al., GCN 5382), of:
dRA: -3.60" dDec: -0.90" +/- 0.64"
and a new XRT refined position of:
```
RA(J2000):   14h 12m 01.31s
Dec(J2000): +16d 58' 54.0"
```
with an estimated uncertainty of 2.1 arcseconds (90% containment).
This position is 4.2 arcseconds from the refined XRT position given in Racusin et al. (GCN 5382), 1.9 arcseconds from the boresight corrected XRT position using the new TELDEF described by Burrows et al. (GCN 5750), and 0.5 arcseconds from the frame shifted position given in Butler et al. (GCN 5389) based upon only the first 25 ks of data. Potential host galaxies B & D from Castro-Tirado et al. and Piranomonte et al. (GCNs 5384 & 5386) both lie inside the new XRT refined error circle. A figure comparing all of these positions is available at: http://www.swift.psu.edu/images/grb060801_astrometry.gif
Galaxy B has a redshift of 1.131 as given by Cucchiara et al. (GCN 5460). We encourage observations of galaxy D to obtain its redshift.
This Circular is an official product of the Swift XRT team.

Back to JG's homepage

Jochen Greiner, last update: 30-Oct-2006 [Disclaimer]