Gamma-ray Burst 120807A

(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 07 Aug 12 07:09:57 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     530267,   Seg_Num: 0
GRB_RA:          241.211d {+16h 04m 51s} (J2000),
                 241.440d {+16h 05m 45s} (current),
                 240.306d {+16h 01m 13s} (1950)
GRB_DEC:         -47.490d {-47d 29' 23"} (J2000),
                 -47.524d {-47d 31' 24"} (current),
                 -47.354d {-47d 21' 13"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6415 [cnts]    Image_Peak=211 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   141     E_range: 15-50 keV
BKG_INTEN:       42956 [cnts]
BKG_TIME:        25766.48 SOD {07:09:26.48} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16146 TJD;   220 DOY;   12/08/07
GRB_TIME:        25777.75 SOD {07:09:37.75} UT
GRB_PHI:         149.27 [deg]
GRB_THETA:        19.54 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    7.03 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -3  +0  +1 +35  +0 
SUN_POSTN:       137.65d {+09h 10m 36s}  +16.28d {+16d 16' 50"}
SUN_DIST:        111.18 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.07d {+01h 00m 17s}  +10.22d {+10d 13' 24"}
MOON_DIST:       126.12 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.33,  3.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      248.74,-26.15 [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 = 116.61,-16.11 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:11:08 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.186d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.488d {-47d 29' 16"} (J2000)
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25849.40 SOD {07:10:49.40} UT,   71.7 [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 07 Aug 12 07:13:29 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     530267,   Seg_Num: 0
GRB_RA:          241.211d {+16h 04m 51s} (J2000),
                 241.440d {+16h 05m 45s} (current),
                 240.306d {+16h 01m 13s} (1950)
GRB_DEC:         -47.490d {-47d 29' 23"} (J2000),
                 -47.524d {-47d 31' 24"} (current),
                 -47.354d {-47d 21' 13"} (1950)
GRB_DATE:        16146 TJD;   220 DOY;   12/08/07
GRB_TIME:        25777.75 SOD {07:09:37.75} UT
TRIGGER_INDEX:   141
GRB_PHI:         149.27 [deg]
GRB_THETA:        19.54 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    7.03 [sigma]
LC_URL:          sw00530267000msb.lc
SUN_POSTN:       137.65d {+09h 10m 36s}  +16.28d {+16d 16' 48"}
SUN_DIST:        111.18 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.10d {+01h 00m 24s}  +10.23d {+10d 13' 60"}
MOON_DIST:       126.14 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.33,  3.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      248.74,-26.15 [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 = 116.61,-16.11 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:14:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 44s} (J2000)
POINT_DEC:       -47.488d {-47d 29' 16"} (J2000)
POINT_ROLL:      271.462d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25852.99 SOD {07:10:52.99} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.731
N_STARS:         172
X_OFFSET:        353 [pixels]
Y_OFFSET:        589 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1548 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00530267000msufc0075.fits
SUN_POSTN:       137.65d {+09h 10m 36s}  +16.28d {+16d 16' 47"}
SUN_DIST:        111.16 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 26s}  +10.24d {+10d 14' 10"}
MOON_DIST:       126.17 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.31,  3.65 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:15:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 44s} (J2000)
POINT_DEC:       -47.488d {-47d 29' 16"} (J2000)
POINT_ROLL:      271.462d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25852.99 SOD {07:10:52.99} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.731
N_STARS:         172
X_OFFSET:        353 [pixels]
Y_OFFSET:        589 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1548 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00530267000msufc0075.fits
SUN_POSTN:       137.65d {+09h 10m 36s}  +16.28d {+16d 16' 47"}
SUN_DIST:        111.16 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 27s}  +10.24d {+10d 14' 15"}
MOON_DIST:       126.17 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.31,  3.65 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:15:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     530267,   Seg_Num: 0
GRB_RA:          241.2610d {+16h 05m 02.63s} (J2000),
                 241.4896d {+16h 05m 57.50s} (current),
                 240.3561d {+16h 01m 25.45s} (1950)
GRB_DEC:         -47.4797d {-47d 28' 46.9"} (J2000),
                 -47.5133d {-47d 30' 47.8"} (current),
                 -47.3439d {-47d 20' 38.0"} (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:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25868.00 SOD {07:11:08.00} UT,   90.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       137.65d {+09h 10m 37s}  +16.28d {+16d 16' 46"}
SUN_DIST:        111.21 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.12d {+01h 00m 28s}  +10.24d {+10d 14' 22"}
MOON_DIST:       126.13 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.36,  3.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      248.78,-26.14 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:16:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 44s} (J2000)
POINT_DEC:       -47.488d {-47d 29' 16"} (J2000)
ROLL:            271.462d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25852.99 SOD {07:10:52.99} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     366016262
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0085.fits
SUN_POSTN:       137.65d {+09h 10m 37s}  +16.28d {+16d 16' 46"}
SUN_DIST:        111.16 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.12d {+01h 00m 29s}  +10.24d {+10d 14' 27"}
MOON_DIST:       126.18 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.31,  3.65 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:16:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 44s} (J2000)
POINT_DEC:       -47.488d {-47d 29' 16"} (J2000)
ROLL:            271.462d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25852.99 SOD {07:10:52.99} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     366016262
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0085.fits
SUN_POSTN:       137.65d {+09h 10m 37s}  +16.28d {+16d 16' 46"}
SUN_DIST:        111.16 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.12d {+01h 00m 30s}  +10.24d {+10d 14' 30"}
MOON_DIST:       126.18 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.31,  3.65 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:21:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.486d {-47d 29' 07"} (J2000)
POINT_ROLL:      271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26065.33 SOD {07:14:25.33} UT,   287.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.176
N_STARS:         118
X_OFFSET:        113 [pixels]
Y_OFFSET:        349 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1788 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00530267000msufc0287.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 42"}
SUN_DIST:        111.16 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.16d {+01h 00m 39s}  +10.26d {+10d 15' 20"}
MOON_DIST:       126.22 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:21:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.486d {-47d 29' 07"} (J2000)
POINT_ROLL:      271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26065.33 SOD {07:14:25.33} UT,   287.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.176
N_STARS:         118
X_OFFSET:        113 [pixels]
Y_OFFSET:        349 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1788 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00530267000msufc0287.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 42"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.17d {+01h 00m 40s}  +10.26d {+10d 15' 24"}
MOON_DIST:       126.22 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:22:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     530267,   Seg_Num: 0
GRB_RA:          241.2593d {+16h 05m 02.23s} (J2000),
                 241.4879d {+16h 05m 57.09s} (current),
                 240.3544d {+16h 01m 25.04s} (1950)
GRB_DEC:         -47.4797d {-47d 28' 46.9"} (J2000),
                 -47.5133d {-47d 30' 47.9"} (current),
                 -47.3439d {-47d 20' 38.0"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  25868.00 SOD {07:11:08.00} UT,   90.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 41"}
SUN_DIST:        111.20 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.17d {+01h 00m 41s}  +10.26d {+10d 15' 28"}
MOON_DIST:       126.18 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.36,  3.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      248.78,-26.14 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:23:02 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.486d {-47d 29' 07"} (J2000)
ROLL:            271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26065.33 SOD {07:14:25.33} UT,   287.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     366016474
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0297.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 41"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.18d {+01h 00m 42s}  +10.26d {+10d 15' 35"}
MOON_DIST:       126.23 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:23:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.185d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.486d {-47d 29' 07"} (J2000)
ROLL:            271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26065.33 SOD {07:14:25.33} UT,   287.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     366016474
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0297.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 41"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.18d {+01h 00m 43s}  +10.26d {+10d 15' 38"}
MOON_DIST:       126.23 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 #13602
F. E. Marshall (NASA/GSFC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), B.P. Gompertz (U Leicester), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 07:09:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120807A (trigger=530267). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 241.211, -47.490 which is
```
   RA(J2000) = 16h 04m 51s
   Dec(J2000) = -47d 29' 23"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 15 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 07:10:49.4 UT, 71.6 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 241.2594, -47.4797 which is equivalent to:
```
   RA(J2000)  = 16h 05m 02.26s
   Dec(J2000) = -47d 28' 47.0"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 123 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.94 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 3.5 (+4.80/-2.19) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 75 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 none of the XRT error circle. 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 large, but uncertain extinction expected.
Burst Advocate for this burst is F. E. Marshall (marshall 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:     Tue 07 Aug 12 07:27:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.186d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.485d {-47d 29' 06"} (J2000)
POINT_ROLL:      271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26644.92 SOD {07:24:04.92} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.612
N_STARS:         190
X_OFFSET:        113 [pixels]
Y_OFFSET:        349 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1788 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00530267000msufc0867.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 38"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.21d {+01h 00m 51s}  +10.27d {+10d 16' 18"}
MOON_DIST:       126.26 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Aug 12 07:27:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.186d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.485d {-47d 29' 06"} (J2000)
POINT_ROLL:      271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26644.92 SOD {07:24:04.92} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.612
N_STARS:         190
X_OFFSET:        113 [pixels]
Y_OFFSET:        349 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1788 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00530267000msufc0867.fits
SUN_POSTN:       137.66d {+09h 10m 38s}  +16.28d {+16d 16' 38"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.21d {+01h 00m 52s}  +10.27d {+10d 16' 22"}
MOON_DIST:       126.26 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:29:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.186d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.485d {-47d 29' 06"} (J2000)
ROLL:            271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26644.92 SOD {07:24:04.92} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     366017054
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0877.fits
SUN_POSTN:       137.66d {+09h 10m 39s}  +16.28d {+16d 16' 37"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.23d {+01h 00m 55s}  +10.28d {+10d 16' 37"}
MOON_DIST:       126.27 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 07 Aug 12 07:29:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     530267,   Seg_Num: 0
POINT_RA:        241.186d {+16h 04m 45s} (J2000)
POINT_DEC:       -47.485d {-47d 29' 06"} (J2000)
ROLL:            271.464d
IMG_START_DATE:  16146 TJD;   220 DOY;   12/08/07
IMG_START_TIME:  26644.92 SOD {07:24:04.92} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     366017054
X_OFFSET:        672 [pixels]
Y_OFFSET:        908 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1068
BINNING_INDEX:   1
IM_URL:          sw00530267000msuni0877.fits
SUN_POSTN:       137.66d {+09h 10m 39s}  +16.28d {+16d 16' 36"}
SUN_DIST:        111.15 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       15.23d {+01h 00m 55s}  +10.28d {+10d 16' 39"}
MOON_DIST:       126.27 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      333.32,  3.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      248.72,-26.15 [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 #13603
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1862 s of XRT Photon Counting mode data and 2 UVOT images for GRB 120807A, 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 = 241.26016, -47.47972 which is equivalent to:
```
RA (J2000): 16h 05m 2.44s
Dec (J2000): -47d 28' 47.0"
```
with an uncertainty of 1.8 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 #13604
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120807A (trigger #530267) (Marshall, et al., GCN Circ. 13602). The BAT ground-calculated position is RA, Dec = 241.273, -47.455 deg, which is
```
   RA(J2000)  =  16h 05m 05.6s 
   Dec(J2000) = -47d 27' 16.3" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The mask-weighted light curves shows a single pulse starting at ~T-5 sec, peaking at ~T+2 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 20.0 +- 5.8 sec (estimated error including systematics).
The time-averaged spectrum from T-0.24 to T+24.07 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.30. The fluence in the 15-150 keV band is 2.9 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.65 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/530267/BA/
GCN Circular #13605
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR), Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 120807 detected by SWIFT (trigger 530267) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 31.5s after the GRB trigger (15.2s after the notice). The elevation of the field decreased from 8 degrees above horizon and weather conditions were poor (due to the low elevation).
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT in the enhanced Swift-XRT position (Evans et al. GCNC 13603) with a limiting magnitude of: t0+31.5s to t0+91.5s : R > 15.5
Further images does not show OT anymore at about the same limiting magnitude until 1500 seconds after the trigger.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=333.3260 lat= +3.6420 and the galactic extinction in R band is about 4 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #13607
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report:
A RAPTOR wide-field monitor located in Maui observed the location of Swift trigger 530267 (Marshall et al., GCN 13602) during the period that the Swift BAT was observing gamma-ray emission. The 10 s exposure began at 07:09:38.7 UTC -- 1 s after the Swift trigger and 1 s before the gamma-ray emission reached peak intensity. We detect no new object at the location of the refined Swift XRT location (Beardmore et al., GCN 13603) to a 3-sigma limiting magnitude of 10.3. Our unfiltered images are calibrated to the Tycho-2 V-band.
GCN Circular #13608
Weikang Zheng and Carl Akerlof (Umich), report on behalf of the ROTSE collaboration:
We analyzed Fermi/LAT data of GRB 120807A (Marshall et al., GCN 13602) as a follow-up of routine search in Swift trigger catalogs in our LAT data processing pipeline using both the matched filter technique (Akerlof et al. 2010, ApJ, 725, L15; 2011 ApJ, 726, 22; 2012, arXiv:1205.3066; Zheng et al. 2012, ApJ 745,72; 2012, arXiv:1203.5113) and likelihood method. We do NOT detect high energy photon emission from both methods by using a standard data selection (with Energy above 100 MeV) in 47.5s duration.
The burst location was about 50 degree from the LAT boresight, and the zenith angle was about 96 degrees at trigger time. This location is very close to Galactic plane (gb = 333.3 and gb= 3.6 degree).
Using the likelihood method, we estimated the upper limit in LAT energy range (0.1 - 10 GeV) is 1.27e-05 (photons cm^-2 s^-1) by assuming a spectral index of -2.2.
The pipeline result is given in the following link: http://rotse.net/LAT/SwiftTriggers/366016180/
GCN Circular #13610
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU) and F.E. Marshall report on behalf of the Swift-XRT team:
We have analysed 2.9 ks of XRT data for GRB 120807A (Marshall et al. GCN Circ. 13602), from 56 s to 75.9 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 13603).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.29 (+0.15, -0.16).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+/-0.3). The best-fitting absorption column is 1.04 (+0.25, -0.22) x 10^22 cm^-2, in excess of the Galactic value of 4.9 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 4.8 x 10^-11 (1.4 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.04 (+0.25, -0.22) x 10^22 cm^-2
Galactic foreground: 4.9 x 10^21 cm^-2
Excess significance: 4.1 sigma
Photon index:	     2.3 (+/-0.3)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00530267.
This circular is an official product of the Swift-XRT team.
GCN Circular #13616
GRB 120807A: Swift/UVOT Upper Limits
M. H. Siegel (PSU) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120807A 75 s after the BAT trigger (Marshall et al., GCN Circ. 13602). No optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ. 13603) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            75          225          147         >20.6
u_FC               288          537          246         >20.4
white               75         1884          431         >21.8
v                  618         1935          156         >19.6
b                  543         1860          136         >20.4
u                  288         1835          363         >20.7
w1                 668         1810          136         >20.3
m2                1591         1611           19         >18.8
w2                 593         1910          117         >19.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.41 in the direction of the burst (Schlegel et al. 1998).
GCN Report 377.1
GCN_Report 377.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_377_1.pdf by F.E. Marshall at NASA/GSFC titled: "Swift Observations of GRB 120807A"
GCN Circular #13776
Weikang Zheng and Carl Akerlof (Umich), report on behalf of the ROTSE collaboration (the authors are not affiliated with the Fermi Collaboration),
The recent GCN Circulars we reported about Fermi-LAT upper limits for GRB 120807A (GCN 13608), 120908A (GCN 13742), 120909A (GCN 13742), and 120911A (GCN 13752) contain an error about the upper limits estimation due to a wrong method. We apologize for the confusion. We thank Giacomo Vianello from LAT group for pointing it out and making suggestion to correct it. We've updated our pipeline result with the appropriate method (see The Fermi LAT team, Ackermann et al., 2012, ApJ, 754, 121). We report the corrected upper limit result (100 MeV -300 GeV; T0-T0 +47.5s) for the 4 GRBs again:
```
GRB 120807A : 5.42e-05 ph/cm2/s
GRB 120908A : 1.79e-04 ph/cm2/s
GRB 120909A : 8.70e-05 ph/cm2/s
GRB 120911A : 3.81e-05 ph/cm2/s
```

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Jochen Greiner, last update: 17-Sep-2012 [Disclaimer]