Gamma-ray Burst 100802A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:46:04 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     430603,   Seg_Num: 0
GRB_RA:            2.457d {+00h 09m 50s} (J2000),
                   2.595d {+00h 10m 23s} (current),
                   1.805d {+00h 07m 13s} (1950)
GRB_DEC:         +47.752d {+47d 45' 06"} (J2000),
                 +47.811d {+47d 48' 38"} (current),
                 +47.474d {+47d 28' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4009 [cnts]    Image_Peak=184 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       24918 [cnts]
BKG_TIME:        20721.95 SOD {05:45:21.95} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15410 TJD;   214 DOY;   10/08/02
GRB_TIME:        20736.16 SOD {05:45:36.16} UT
GRB_PHI:          -7.27 [deg]
GRB_THETA:        29.16 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.60 [sigma]
IMAGE_SIGNIF:    7.45 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  -2  +0  +0 +18  +0 
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 52"}
SUN_DIST:        100.50 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.76d {+01h 39m 02s}  +15.66d {+15d 39' 42"}
MOON_DIST:        36.98 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       25.53, 41.89 [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 = 347.02,16.41 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:47:24 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     430603,   Seg_Num: 0
GRB_RA:            2.4673d {+00h 09m 52.15s} (J2000),
                   2.6058d {+00h 10m 25.38s} (current),
                   1.8154d {+00h 07m 15.69s} (1950)
GRB_DEC:         +47.7545d {+47d 45' 16.2"} (J2000),
                 +47.8134d {+47d 48' 48.1"} (current),
                 +47.4763d {+47d 28' 34.6"} (1950)
GRB_ERROR:       5.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.09e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.48 [sigma]
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20815.84 SOD {05:46:55.84} UT,   79.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.22 261.46 243.48
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 51"}
SUN_DIST:        100.49 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.77d {+01h 39m 05s}  +15.67d {+15d 39' 56"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the burst
ECL_COORDS:       25.54, 41.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.45 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:47:34 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     430603,   Seg_Num: 0
GRB_RA:            2.4673d {+00h 09m 52.1s} (J2000),
                   2.6058d {+00h 10m 25.3s} (current),
                   1.8154d {+00h 07m 15.6s} (1950)
GRB_DEC:         +47.7545d {+47d 45' 16.2"} (J2000),
                 +47.8134d {+47d 48' 48.1"} (current),
                 +47.4763d {+47d 28' 34.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       72 [cnts]
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20815.84 SOD {05:46:55.84} UT,   79.7 [sec] since BAT Trigger Time
CENTROID_X:      282.63,  raw= 283  [pixels]
CENTROID_Y:      301.13,  raw= 301  [pixels]
ROLL:            48.07 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.39
GRB_POS_XRT_Z:   -46.34
IMAGE_URL:       sw00430603000msxps_rw.img
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 51"}
SUN_DIST:        100.49 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.77d {+01h 39m 05s}  +15.67d {+15d 39' 57"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the burst
ECL_COORDS:       25.54, 41.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:47:43 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     430603,   Seg_Num: 0
GRB_RA:            2.4673d {+00h 09m 52.1s} (J2000),
                   2.6058d {+00h 10m 25.3s} (current),
                   1.8154d {+00h 07m 15.6s} (1950)
GRB_DEC:         +47.7545d {+47d 45' 16.2"} (J2000),
                 +47.8134d {+47d 48' 48.1"} (current),
                 +47.4763d {+47d 28' 34.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       72 [cnts]
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20815.84 SOD {05:46:55.84} UT,   79.7 [sec] since BAT Trigger Time
CENTROID_X:      282.63,  raw= 283  [pixels]
CENTROID_Y:      301.13,  raw= 301  [pixels]
ROLL:            48.07 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.39
GRB_POS_XRT_Z:   -46.34
IMAGE_URL:       sw00430603000msxps_rw.img
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 51"}
SUN_DIST:        100.49 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.77d {+01h 39m 05s}  +15.67d {+15d 39' 59"}
MOON_DIST:        36.98 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the burst
ECL_COORDS:       25.54, 41.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:49:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     430603,   Seg_Num: 0
GRB_RA:            2.457d {+00h 09m 50s} (J2000),
                   2.595d {+00h 10m 23s} (current),
                   1.805d {+00h 07m 13s} (1950)
GRB_DEC:         +47.752d {+47d 45' 06"} (J2000),
                 +47.811d {+47d 48' 38"} (current),
                 +47.474d {+47d 28' 25"} (1950)
GRB_DATE:        15410 TJD;   214 DOY;   10/08/02
GRB_TIME:        20736.16 SOD {05:45:36.16} UT
TRIGGER_INDEX:   155
GRB_PHI:          -7.27 [deg]
GRB_THETA:        29.16 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.60 [sigma]
IMAGE_SIGNIF:    7.45 [sigma]
LC_URL:          sw00430603000msb.lc
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 50"}
SUN_DIST:        100.50 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.79d {+01h 39m 08s}  +15.67d {+15d 40' 15"}
MOON_DIST:        36.98 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       25.53, 41.89 [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 = 347.02,16.41 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:49:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.456d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.744d {+47d 44' 37"} (J2000)
POINT_ROLL:      48.071d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20824.74 SOD {05:47:04.74} UT,   88.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.990
N_STARS:         145
X_OFFSET:        512 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00430603000msufc0088.fits
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 49"}
SUN_DIST:        100.50 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.79d {+01h 39m 10s}  +15.67d {+15d 40' 22"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:49:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.456d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.744d {+47d 44' 37"} (J2000)
POINT_ROLL:      48.071d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20824.74 SOD {05:47:04.74} UT,   88.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.990
N_STARS:         145
X_OFFSET:        512 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00430603000msufc0088.fits
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 49"}
SUN_DIST:        100.50 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.79d {+01h 39m 10s}  +15.67d {+15d 40' 22"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:50:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.456d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.744d {+47d 44' 37"} (J2000)
POINT_ROLL:      48.071d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20824.74 SOD {05:47:04.74} UT,   88.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.990
N_STARS:         145
X_OFFSET:        512 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00430603000msufc0088.fits
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 49"}
SUN_DIST:        100.50 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.79d {+01h 39m 11s}  +15.67d {+15d 40' 26"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.88 [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:     Mon 02 Aug 10 05:51:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.456d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.744d {+47d 44' 37"} (J2000)
ROLL:            48.071d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20824.74 SOD {05:47:04.74} UT,   88.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302420830
X_OFFSET:        883 [pixels]
Y_OFFSET:        827 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       987
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0095.fits
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 48"}
SUN_DIST:        100.51 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.80d {+01h 39m 13s}  +15.68d {+15d 40' 36"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 05:51:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.456d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.744d {+47d 44' 37"} (J2000)
ROLL:            48.071d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  20824.74 SOD {05:47:04.74} UT,   88.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302420830
X_OFFSET:        883 [pixels]
Y_OFFSET:        827 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       987
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0095.fits
SUN_POSTN:       132.29d {+08h 49m 10s}  +17.78d {+17d 46' 48"}
SUN_DIST:        100.51 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.80d {+01h 39m 13s}  +15.68d {+15d 40' 39"}
MOON_DIST:        36.97 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.73,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #11031
E. Troja (NASA/GSFC/ORAU), J. M. Gelbord (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), O. M. Littlejohns (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 05:45:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100802A (trigger=430603). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 2.457, +47.752 which is
```
   RA(J2000) = 00h 09m 50s
   Dec(J2000) = +47d 45' 06"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED peak structure with a duration of about 30 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 05:46:55.8 UT, 79.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 2.4673, +47.7545 which is equivalent to:
```
   RA(J2000)  = 00h 09m 52.15s
   Dec(J2000) = +47d 45' 16.2"
```
with an uncertainty of 5.1 arcseconds (radius, 90% containment). This location is 26 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 2.09e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 88 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 0.12.
Burst Advocate for this burst is E. Troja (eleonora.troja AT 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:     Mon 02 Aug 10 06:12:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.066d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21037.37 SOD {05:50:37.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.974
N_STARS:         100
X_OFFSET:        563 [pixels]
Y_OFFSET:        507 [pixels]
X_MAX:           1522 [pixels]
Y_MAX:           1466 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00430603000msufc0301.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 35"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.98d {+01h 39m 55s}  +15.74d {+15d 44' 16"}
MOON_DIST:        36.99 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:12:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.066d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21037.37 SOD {05:50:37.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.974
N_STARS:         100
X_OFFSET:        563 [pixels]
Y_OFFSET:        507 [pixels]
X_MAX:           1522 [pixels]
Y_MAX:           1466 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00430603000msufc0301.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 35"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.98d {+01h 39m 55s}  +15.74d {+15d 44' 16"}
MOON_DIST:        36.99 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:13:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.066d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21037.37 SOD {05:50:37.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.974
N_STARS:         100
X_OFFSET:        563 [pixels]
Y_OFFSET:        507 [pixels]
X_MAX:           1522 [pixels]
Y_MAX:           1466 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00430603000msufc0301.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 34"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.98d {+01h 39m 56s}  +15.74d {+15d 44' 19"}
MOON_DIST:        36.99 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [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:     Mon 02 Aug 10 06:14:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
ROLL:            48.066d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21037.37 SOD {05:50:37.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     302421043
X_OFFSET:        883 [pixels]
Y_OFFSET:        827 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       987
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0308.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 34"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.99d {+01h 39m 58s}  +15.74d {+15d 44' 30"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:14:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 48s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.065d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21616.49 SOD {06:00:16.49} UT,   880.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.407
N_STARS:         190
X_OFFSET:        323 [pixels]
Y_OFFSET:        267 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1706 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00430603000msufc0880.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 33"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       25.00d {+01h 40m 00s}  +15.74d {+15d 44' 38"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:14:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 49s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
ROLL:            48.066d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21037.37 SOD {05:50:37.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     302421043
X_OFFSET:        883 [pixels]
Y_OFFSET:        827 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       987
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0308.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 33"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       24.99d {+01h 39m 59s}  +15.74d {+15d 44' 33"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:15:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 48s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.065d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21616.49 SOD {06:00:16.49} UT,   880.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.407
N_STARS:         190
X_OFFSET:        323 [pixels]
Y_OFFSET:        267 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1706 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00430603000msufc0880.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 33"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       25.00d {+01h 40m 00s}  +15.74d {+15d 44' 41"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [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:     Mon 02 Aug 10 06:14:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 48s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
POINT_ROLL:      48.065d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21616.49 SOD {06:00:16.49} UT,   880.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.407
N_STARS:         190
X_OFFSET:        323 [pixels]
Y_OFFSET:        267 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1706 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00430603000msufc0880.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 33"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       25.00d {+01h 40m 00s}  +15.74d {+15d 44' 38"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Aug 10 06:16:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 48s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
ROLL:            48.065d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21616.49 SOD {06:00:16.49} UT,   880.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302421622
X_OFFSET:        882 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0887.fits
SUN_POSTN:       132.31d {+08h 49m 14s}  +17.78d {+17d 46' 32"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       25.01d {+01h 40m 03s}  +15.75d {+15d 44' 53"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [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:     Mon 02 Aug 10 06:16:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430603,   Seg_Num: 0
POINT_RA:          2.452d {+00h 09m 48s} (J2000)
POINT_DEC:       +47.745d {+47d 44' 43"} (J2000)
ROLL:            48.065d
IMG_START_DATE:  15410 TJD;   214 DOY;   10/08/02
IMG_START_TIME:  21616.49 SOD {06:00:16.49} UT,   880.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302421622
X_OFFSET:        882 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00430603000msuni0887.fits
SUN_POSTN:       132.31d {+08h 49m 15s}  +17.78d {+17d 46' 32"}
SUN_DIST:        100.52 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:       25.01d {+01h 40m 03s}  +15.75d {+15d 44' 56"}
MOON_DIST:        37.00 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      115.72,-14.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.53, 41.89 [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 #11032
M. H. Siegel (PSU) and E. Troya (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team:
UVOT took a finding chart exposure of 250 seconds with the U filter starting 301 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	00:09:52.47 =  2.46862
  DEC(J2000) = +47:45:19.1  = 47.75531
```
with a 90%-confidence error radius of about 0.78 arc sec. This position is 4.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.56 with a 1-sigma error of about 0.21. No correction has been made for the expected extinction corresponding to E(B-V) of 0.12.
GCN Circular #11033
S. B. Pandey (U Mich), H. Flewelling (IfA/Hawaii), W. Zheng (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 100802A (Swift trigger 430603; Troja, E., GCN 11031), producing images beginning 9.1 s after the GCN notice time. An automated response took the first image at 05:46:10.1 UT, 27.9 s after the burst, and during the gamma-ray emission, under fair conditions. We took 10 5-sec, 10 20-sec and 10 60-sec exposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle or the XRT error circle, for both single images and coadding into sets of 10. Individual images have limiting magnitudes ranging from 15.3-17.6; we set the following specific limits.
```
start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
05:46:10.1   05:46:15.1         5     15.3           27.9       N
05:47:30.9   05:52:12.0       281     18.2          108.7       Y
```
GCN Circular #11034
C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana), report on behalf of a large collaboration:
On 2010 August 02 at 05:51:53 UT the 2-m Liverpool Telescope automatically began observing the Swift GRB 100802A (Troja et al., GCN Circ. 11031) using the r' filter, corresponding to 6.3 minutes after the burst trigger time.
We do not detect any uncatalogued source within the XRT error circle. We do not detect the possible afterglow candidate reported by UVOT either (Siegel and Troja, GCN Circ. 11032) with the following upper limit:
```
Mid time from  Total Exp   Filter    Magnitude
trigger (s)    (s)
-------------------------------------------------
530            6x10        r' > 18.8
-------------------------------------------------
```
Magnitude has been calibrated from nearby USNOB1.0 R2 stars.
GCN Circular #11035
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), E. Troja (NASA/GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100802A (trigger #430603) (Troja, et al., GCN Circ. 11031). The BAT ground-calculated position is RA, Dec = 2.482, 47.752 deg, which is
```
   RA(J2000)  =  00h 09m 55.6s 
   Dec(J2000) = +47d 45' 05.5" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%.
The mask-weighted light curve shows a FRED peak starting at ~T-7 sec and peaking at ~T+1sec. There is a second peak on the tail of the first at ~T+90 sec. There is also a long peak starting around T+250, peaking at ~T+450 sec, and ending at ~T+700 sec. T90 (15-350 keV) is 487 +- 30 sec (estimated error including systematics).
The time-averaged spectrum from T-3.3 to T+531.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.10. The fluence in the 15-150 keV band is 3.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band is 0.9 +- 0.1 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/430603/BA/
GCN Circular #11036
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 794 s of XRT Photon Counting mode data and 2 UVOT images for GRB 100802A, 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 = 2.46849, +47.75479 which is equivalent to:
```
RA (J2000): 00h 09m 52.44s
Dec (J2000): +47d 45' 17.3"
```
with an uncertainty of 2.0 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 #11038
A. Breeveld (MSSL/UCL) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100802A=20 89 s after the BAT trigger (Troja et al., GCN Circ. 11031). Using the=20 data from the most recent telemetry, there is a tentative detection of=20 an optical afterglow at the position given by Siegel et al., GCN Circ.=20 11032, in the early white and u exposures. Preliminary detections and later 3-sigma upper limits using the UVOT=20 photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first=20 finding chart (FC) exposures and subsequent summed exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            89          238          147         20.7 =B1 0.24
u_FC               301          551          246         19.57 =B1 0.22
white              581         5566          327         21.85 =B1 0.48=20 (2.4 sigma sig)
v                  632         5977          432         >20.6
b                  557         6754          388         >21.2
u                  706         6593          412         >20.92
w1                 682         6388          432         >20.9
m2                 657         6183          432         >20.6
w2                 608         5772          432         >21.0
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.12 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11039
A. Rowlinson (U. Leicester) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 100802A (Troja et al. GCN Circ. 11031), from 69 s to 24.0 ks after the BAT trigger. The data comprise 804 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 11036).
The light curve can be modelled with an initial power-law decay with an index of alpha=1.64 (+0.03, -0.03) and a flare peaking at 515 s which is consistent with a BAT peak (Baumgartner et al. GCN Circ. 11035). At T+11500 s, the light curve breaks to a decay with alpha=0.06 (+0.26, -0.21).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.88 (+/-0.03). The best-fitting absorption column is 1.93 (+/-0.09) x 10^21 cm^-2, in excess of the Galactic value of 9.7 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1. The PC mode spectrum can be fitted with an absorbed power-law with a photon spectral index of 2.21 (+0.23, -0.33). The best-fitting absorption column is 1.39 (+0.82, -0.42) x 10^21 cm^-2, in excess of the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 0.06, the count rate at T+24 hours will be 1.6 x 10^-2 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.6 x 10^-13 (8.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00430603.
This circular is an official product of the Swift-XRT team.
GCN Circular #11040
S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
We have imaged the field of GRB100802A (Troja et al., GCN 11031) with the automated Palomar 60 inch telescope. Observations were taken in the Sloan r', i', and z' filters beginning at 05:51 UT on 2 August (~ 6 minutes after the BAT trigger).
In a co-added r'-band image (mid-point 06:02 UT, or ~ 17 minutes after the burst trigger), we detect a marginal source at the location of the candidate UVOT afterglow (Siegel and Troja, GCN 11032; Breeveld and Troja, GCN 11038). Calibrating with respect to several USNO-B1 catalog objects, we measure R = 21.3 +/- 0.3 mag. No object is detected at this location in a co-added i'-band image (mid-point 06:04 UT, or ~ 18.5 minutes after the burst trigger) to a limiting magnitude of I > 20.6.
The values quoted above are not corrected for Galactic extinction.
GCN Circular #11041
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 100802A (Troja et al., GCNC 11031) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2010-08-02 11:43:26 UT (~6 h after the burst). We did not find any new point source within the XRT error circle and the enhanced XRT error circle (Evans et al., GCNC 11036) in all the three bands. Also, we could not detect the previously reported afterglow (Siegel and Troya, GCN 11032).
Three sigma upper limits of the OT are listed below. We used GSC 2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.29658    12:52:41  9480.0     >19.9  >19.8  >19.3
------------------------------------------------------
```
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
GCN Circular #11042
D. Xu (Weizmann Inst.), D. Malesani (DARK/NBI), P. Jakobsson (Univ. of Iceland), P. A. Wilson, R. Nilsson (NOT), report on behalf of a larger collaboration:
We have imaged the field of GRB100802A (Troja et al., GCN #11031) with the Nordic Optical Telescope equipped with ALFOSC. Observations started at 02:49 UT, 3rd August (~21.06 hrs after the BAT trigger) and four 900 s frames in the R band were obtained.
We detect an optical source localised at
```
RA(J2000) = 00:09:52.38
Dec(J2000) = +47:45:18.8
```
with an error radius of 0.4". This position is 0.96" +/- 0.85" S-W of the UVOT position (Siegel & Troja, GCN #11032). We therefore identify this source as the afterglow of GRB100802A. A finding chart is visible at the following URL:
http://www.astro.ku.dk/~malesani/GRB/100802A/GRB100802A_NOT.jpg.
Based on the USNO-B1 catalog (R1 magnitudes), we find R=22.9+/-0.3 at a mean epoch of 21.6 hr after the BAT trigger. Compared with the P60 detection (Cenko, GCN #11040), our measurement confirms a clear fading, and implies a rather shallow decay of the afterglow light curve with alpha = 0.34 +/- 0.08 assuming an unbroken power-law decay F(t) propto t^-alpha. This might suggest some contribution from an underlying host galaxy.
GCN Circular #11046
Elisabetta Bissaldi (MPE) reports on behalf of the Fermi GBM Team:
"At 05:45:35.68 UT on 2 August 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100802A (trigger 302420737 / 100802240), which was also detected by the Swift-BAT (Troja et al. 2010, GCN 11031). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 76 degrees.
The GBM light curve consists of an initial peak followed by a softer tail with a duration (T90) of about 100 s (50-300 keV). The time-averaged spectrum from T0 to T0+40 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is -1.17 (+0.21/-0.25) and the cutoff energy, parameterized as Epeak, is 149 (+41/-96) keV (Castor C-STAT 669 for 479 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (2.24 +/- 0.28)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+62 s in the 10-1000 keV band is 3.2 +/- 0.6 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11061
Adria C. Updike, Ginger Bryngelson, Dieter H. Hartmann (Clemson University) and Peter A. Milne (Steward Observatory) report:
We observed the field of GRB 100802A (Troja et al., GCN 11031) with the 3.5m WIYN telescope at KPNO equipped with WHIRC on August 3, 2010 beginning 26 hours and 13 minutes after the trigger and continuing for 26 minutes in the K band under good conditions. We do not detect the afterglow (Siegel & Troja, GCN 11032; Cenko, GCN 11040) or any source within the enhanced XRT position (Evans et al., GCN 11036) to limiting magnitude of K > 18.8 upon comparison to the 2MASS catalog and field stars. No further observations are planned.
GCN Circular #11082
Nis B. Andreasen, Louise Dyregaard Nielsen, Christopher Groenbech, Simone J. Jakobsen, Jonatan Selsing, Lasse Oedegaard (Niels Bohr Inst.), Johan P.U. Fynbo, Daniele Malesani (DARK/NBI), Dong Xu (Weizmann Inst.), and Pall Jakobsson (Univ. Iceland), report on behalf of a larger collaboration:
We observed the field of GRB 100802A (Troja et al., GCN 11031, Siegel & Troja, GCN 11032) with the NOT equipped with ALFOSC. Observations were carried out with mean time Aug 11.10 UT (212.7 hr after the GRB).
The object seen in our early-time NOT image (Xu et al., GCN 11042) is barely detected in the new stacked image, and has decayed by 1.3 +/- 0.4 mag between the two epochs.
We note that the NOT object is slightly offset (by ~1.1" W) with respect to the UVOT position (GCN 11032; also confirmed by P60 imaging; B. Cenko, priv. comm.). Coupled to the slow decay, this may indicate the presence of an underlying constant source of light, which could be the host galaxy or a foreground, unrelated object.
An image showing the two epochs is available at the following URL:
http://www.astro.ku.dk/~malesani/GRB/100802A/GRB100802A_epoch2.jpg
Given the relative brightness of the underlying source (R ~ 23.7), we encourage further photometric and spectroscopic observations.
GCN Report 296.1
GCN_Report 296.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_296_1.pdf by E. Troja at NASA/GSFC/ORAU titled: "Final report on Swift Observations of GRB 100802A"
arXiv:1504.02482 g-band detection of afterglow and B-band detection of host: z<4
In final paper (https://iopscience.iop.org/article/10.3847/0004-637X/817/1/7) refined to z<3.1

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Jochen Greiner, last update: 04-Mar-2021 [Disclaimer]