Gamma-ray Burst 120724A

(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 24 Jul 12 06:39:44 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.190d {+16h 20m 46s} (J2000),
                 245.347d {+16h 21m 23s} (current),
                 244.565d {+16h 18m 16s} (1950)
GRB_DEC:          +3.509d {+03d 30' 33"} (J2000),
                  +3.480d {+03d 28' 48"} (current),
                  +3.627d {+03d 37' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       23616 [cnts]    Image_Peak=408 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   297     E_range: 15-50 keV
BKG_INTEN:       217905 [cnts]
BKG_TIME:        23886.54 SOD {06:38:06.54} UT
BKG_DUR:         40 [sec]
GRB_DATE:        16132 TJD;   206 DOY;   12/07/24
GRB_TIME:        23942.86 SOD {06:39:02.86} UT
GRB_PHI:         -36.60 [deg]
GRB_THETA:        37.45 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     6.32 [sigma]
IMAGE_SIGNIF:    7.90 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  -2  +0  +0 +46  +0 
SUN_POSTN:       124.02d {+08h 16m 05s}  +19.76d {+19d 45' 49"}
SUN_DIST:        117.89 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.54d {+12h 10m 09s}   -5.87d {-05d 52' 04"}
MOON_DIST:        63.41 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.13, 34.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.57, 24.62 [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 = 198.44,-20.48 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:41:19 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.1819d {+16h 20m 43.65s} (J2000),
                 245.3390d {+16h 21m 21.35s} (current),
                 244.5571d {+16h 18m 13.70s} (1950)
GRB_DEC:          +3.5082d {+03d 30' 29.5"} (J2000),
                  +3.4789d {+03d 28' 44.1"} (current),
                  +3.6264d {+03d 37' 35.1"} (1950)
GRB_ERROR:       6.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.14e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.19 [sigma]
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24052.00 SOD {06:40:52.00} UT,   109.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.22 261.56 243.70
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       124.02d {+08h 16m 05s}  +19.76d {+19d 45' 48"}
SUN_DIST:        117.89 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.55d {+12h 10m 13s}   -5.87d {-05d 52' 23"}
MOON_DIST:        63.39 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.12, 34.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.56, 24.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.47 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:41:33 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.1819d {+16h 20m 43.6s} (J2000),
                 245.3390d {+16h 21m 21.3s} (current),
                 244.5571d {+16h 18m 13.7s} (1950)
GRB_DEC:          +3.5082d {+03d 30' 29.5"} (J2000),
                  +3.4789d {+03d 28' 44.1"} (current),
                  +3.6264d {+03d 37' 35.1"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24052.00 SOD {06:40:52.00} UT,   109.1 [sec] since BAT Trigger Time
CENTROID_X:      244.85,  raw= 245  [pixels]
CENTROID_Y:      318.73,  raw= 319  [pixels]
ROLL:            294.53 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   48.88
GRB_POS_XRT_Z:   -138.70
IMAGE_URL:       sw00528443000msxps_rw.img
SUN_POSTN:       124.02d {+08h 16m 05s}  +19.76d {+19d 45' 48"}
SUN_DIST:        117.89 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.55d {+12h 10m 13s}   -5.87d {-05d 52' 26"}
MOON_DIST:        63.39 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.12, 34.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.56, 24.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:41:37 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.1819d {+16h 20m 43.6s} (J2000),
                 245.3390d {+16h 21m 21.3s} (current),
                 244.5571d {+16h 18m 13.7s} (1950)
GRB_DEC:          +3.5082d {+03d 30' 29.5"} (J2000),
                  +3.4789d {+03d 28' 44.1"} (current),
                  +3.6264d {+03d 37' 35.1"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24052.00 SOD {06:40:52.00} UT,   109.1 [sec] since BAT Trigger Time
CENTROID_X:      244.85,  raw= 245  [pixels]
CENTROID_Y:      318.73,  raw= 319  [pixels]
ROLL:            294.53 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   48.88
GRB_POS_XRT_Z:   -138.70
IMAGE_URL:       sw00528443000msxps_rw.img
SUN_POSTN:       124.02d {+08h 16m 05s}  +19.76d {+19d 45' 48"}
SUN_DIST:        117.89 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.56d {+12h 10m 13s}   -5.87d {-05d 52' 26"}
MOON_DIST:        63.39 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.12, 34.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.56, 24.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:42:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.190d {+16h 20m 46s} (J2000),
                 245.347d {+16h 21m 23s} (current),
                 244.565d {+16h 18m 16s} (1950)
GRB_DEC:          +3.509d {+03d 30' 33"} (J2000),
                  +3.480d {+03d 28' 48"} (current),
                  +3.627d {+03d 37' 39"} (1950)
GRB_DATE:        16132 TJD;   206 DOY;   12/07/24
GRB_TIME:        23942.86 SOD {06:39:02.86} UT
TRIGGER_INDEX:   297
GRB_PHI:         -36.60 [deg]
GRB_THETA:        37.45 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     6.32 [sigma]
IMAGE_SIGNIF:    7.90 [sigma]
LC_URL:          sw00528443000msb.lc
SUN_POSTN:       124.02d {+08h 16m 06s}  +19.76d {+19d 45' 48"}
SUN_DIST:        117.89 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.57d {+12h 10m 16s}   -5.88d {-05d 52' 41"}
MOON_DIST:        63.39 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.13, 34.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.57, 24.62 [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 = 198.44,-20.48 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:44:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.222d {+16h 20m 53s} (J2000)
POINT_DEC:        +3.505d {+03d 30' 17"} (J2000)
POINT_ROLL:      294.534d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24060.46 SOD {06:41:00.46} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.963
N_STARS:         57
X_OFFSET:        656 [pixels]
Y_OFFSET:        384 [pixels]
X_MAX:           1615 [pixels]
Y_MAX:           1343 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00528443000msufc0117.fits
SUN_POSTN:       124.02d {+08h 16m 06s}  +19.76d {+19d 45' 47"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.58d {+12h 10m 19s}   -5.88d {-05d 52' 57"}
MOON_DIST:        63.41 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.60, 24.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:44:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.222d {+16h 20m 53s} (J2000)
POINT_DEC:        +3.505d {+03d 30' 17"} (J2000)
POINT_ROLL:      294.534d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24060.46 SOD {06:41:00.46} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.963
N_STARS:         57
X_OFFSET:        656 [pixels]
Y_OFFSET:        384 [pixels]
X_MAX:           1615 [pixels]
Y_MAX:           1343 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00528443000msufc0117.fits
SUN_POSTN:       124.02d {+08h 16m 06s}  +19.76d {+19d 45' 47"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.58d {+12h 10m 20s}   -5.88d {-05d 53' 03"}
MOON_DIST:        63.41 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.60, 24.62 [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 24 Jul 12 06:45:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.222d {+16h 20m 53s} (J2000)
POINT_DEC:        +3.505d {+03d 30' 17"} (J2000)
ROLL:            294.534d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24060.46 SOD {06:41:00.46} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364804869
X_OFFSET:        1002 [pixels]
Y_OFFSET:        657 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       817
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0127.fits
SUN_POSTN:       124.03d {+08h 16m 06s}  +19.76d {+19d 45' 46"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.59d {+12h 10m 22s}   -5.89d {-05d 53' 13"}
MOON_DIST:        63.40 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.60, 24.62 [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:     Tue 24 Jul 12 06:45:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.222d {+16h 20m 53s} (J2000)
POINT_DEC:        +3.505d {+03d 30' 17"} (J2000)
ROLL:            294.534d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24060.46 SOD {06:41:00.46} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364804869
X_OFFSET:        1002 [pixels]
Y_OFFSET:        657 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       817
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0127.fits
SUN_POSTN:       124.03d {+08h 16m 06s}  +19.76d {+19d 45' 46"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.59d {+12h 10m 22s}   -5.89d {-05d 53' 16"}
MOON_DIST:        63.40 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.60, 24.62 [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:     Tue 24 Jul 12 06:51:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.224d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
POINT_ROLL:      294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24272.59 SOD {06:44:32.59} UT,   329.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.545
N_STARS:         43
X_OFFSET:        682 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1296 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00528443000msufc0329.fits
SUN_POSTN:       124.03d {+08h 16m 07s}  +19.76d {+19d 45' 43"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.64d {+12h 10m 34s}   -5.91d {-05d 54' 26"}
MOON_DIST:        63.35 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:51:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.224d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
POINT_ROLL:      294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24272.59 SOD {06:44:32.59} UT,   329.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.545
N_STARS:         43
X_OFFSET:        682 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1296 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00528443000msufc0329.fits
SUN_POSTN:       124.03d {+08h 16m 07s}  +19.76d {+19d 45' 43"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.65d {+12h 10m 35s}   -5.91d {-05d 54' 30"}
MOON_DIST:        63.35 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #13510
P. D'Avanzo (INAF-OAB), W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC), H. A. Krimm (CRESST/GSFC/USRA), B. Sbarufatti (INAF-OAB/PSU) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 06:39:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120724A (trigger=528443). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 245.190, +3.509 which is
```
   RA(J2000) = 16h 20m 46s
   Dec(J2000) = +03d 30' 33"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 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 06:40:52.0 UT, 109.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 245.18192, 3.50750 which is equivalent to:
```
   RA(J2000)  = 16h 20m 43.66s
   Dec(J2000) = +03d 30' 27.0"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 29 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.29 x 10^20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 5.14e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 117 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 0.05.
Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT brera.inaf.it). 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 24 Jul 12 06:52:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.224d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
ROLL:            294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24272.59 SOD {06:44:32.59} UT,   329.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     364805082
X_OFFSET:        1002 [pixels]
Y_OFFSET:        657 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       817
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0339.fits
SUN_POSTN:       124.03d {+08h 16m 07s}  +19.76d {+19d 45' 42"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.65d {+12h 10m 37s}   -5.91d {-05d 54' 39"}
MOON_DIST:        63.34 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [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:     Tue 24 Jul 12 06:52:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.224d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
ROLL:            294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24272.59 SOD {06:44:32.59} UT,   329.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     364805082
X_OFFSET:        1002 [pixels]
Y_OFFSET:        657 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       817
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0339.fits
SUN_POSTN:       124.03d {+08h 16m 07s}  +19.76d {+19d 45' 42"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.65d {+12h 10m 37s}   -5.91d {-05d 54' 41"}
MOON_DIST:        63.34 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [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:     Tue 24 Jul 12 06:52:13 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     528443,   Seg_Num: 0
GRB_RA:          245.1802d {+16h 20m 43.24s} (J2000),
                 245.3373d {+16h 21m 20.94s} (current),
                 244.5554d {+16h 18m 13.29s} (1950)
GRB_DEC:          +3.5080d {+03d 30' 28.8"} (J2000),
                  +3.4787d {+03d 28' 43.4"} (current),
                  +3.6262d {+03d 37' 34.4"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24107.00 SOD {06:41:47.00} UT,   164.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       124.03d {+08h 16m 07s}  +19.76d {+19d 45' 43"}
SUN_DIST:        117.88 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.65d {+12h 10m 36s}   -5.91d {-05d 54' 35"}
MOON_DIST:        63.30 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.12, 34.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.56, 24.61 [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 24 Jul 12 06:56:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.223d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
POINT_ROLL:      294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24802.19 SOD {06:53:22.19} UT,   859.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.004
N_STARS:         164
X_OFFSET:        442 [pixels]
Y_OFFSET:        97 [pixels]
X_MAX:           1881 [pixels]
Y_MAX:           1536 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00528443000msufc0859.fits
SUN_POSTN:       124.03d {+08h 16m 08s}  +19.76d {+19d 45' 40"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.69d {+12h 10m 45s}   -5.92d {-05d 55' 27"}
MOON_DIST:        63.31 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 12 06:56:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.223d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
POINT_ROLL:      294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24802.19 SOD {06:53:22.19} UT,   859.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.004
N_STARS:         164
X_OFFSET:        442 [pixels]
Y_OFFSET:        97 [pixels]
X_MAX:           1881 [pixels]
Y_MAX:           1536 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00528443000msufc0859.fits
SUN_POSTN:       124.03d {+08h 16m 08s}  +19.76d {+19d 45' 40"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.69d {+12h 10m 46s}   -5.93d {-05d 55' 29"}
MOON_DIST:        63.30 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [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 24 Jul 12 06:57:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.223d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
ROLL:            294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24802.19 SOD {06:53:22.19} UT,   859.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364805611
X_OFFSET:        1001 [pixels]
Y_OFFSET:        656 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       816
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0869.fits
SUN_POSTN:       124.03d {+08h 16m 08s}  +19.76d {+19d 45' 40"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.70d {+12h 10m 48s}   -5.93d {-05d 55' 44"}
MOON_DIST:        63.29 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [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 24 Jul 12 06:58:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     528443,   Seg_Num: 0
POINT_RA:        245.223d {+16h 20m 54s} (J2000)
POINT_DEC:        +3.503d {+03d 30' 12"} (J2000)
ROLL:            294.532d
IMG_START_DATE:  16132 TJD;   206 DOY;   12/07/24
IMG_START_TIME:  24802.19 SOD {06:53:22.19} UT,   859.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364805611
X_OFFSET:        1001 [pixels]
Y_OFFSET:        656 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       816
BINNING_INDEX:   1
IM_URL:          sw00528443000msuni0869.fits
SUN_POSTN:       124.03d {+08h 16m 08s}  +19.76d {+19d 45' 39"}
SUN_DIST:        117.92 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      182.70d {+12h 10m 49s}   -5.93d {-05d 55' 47"}
MOON_DIST:        63.29 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:       17.14, 34.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.61, 24.62 [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 #13511
C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), J. Japelj (U. Ljubljana) on behalf of a large collaboration report:
The 2-m Faulkes Telescope North automatically began observing GRB 120724A (D'Avanzo et al. GCN Circ. 13510) on July 24 2012, 06:42:31 UT corresponding to 209 seconds post burst trigger with BVRi' filters. Within the XRT error circle we found the following uncatalogued fading source,
```
R.A. = 16:20:43.21
Dec = +03:30:29.3   (J2000)
```
with an uncertainty of about 1" with a magnitude of 20.5 +/- 0.3 in the i band at 13.8 minutes, calibrated against nearby USNOB-1 stars. The source is also visible in stacked R-band frames.
GCN Circular #13512
A. Cucchiara (UCSC/UCO Lick), N.R. Tanvir (U. Leicester), D. Perley (Caltech), and A. J. Levan (U. Warwick) report on behalf of a larger collaboration:
We observed the afterglow of GRB 120724A (Guidorzi et al. GCN 13511; D'Avanzo et al. GCN 13510) using the GMOS-N spectrograph on the Gemini-North telescope under very good seeing conditions (0.5").
Observations began at 2012-7-24 08:31 UT, about 2 hr post-burst. Two spectra of 900s each were acquired, covering the 6000-10000 Angstrom wavelength range.
A preliminary analysis of some of the absorption features identified suggests that the GRB redshift is z = 1.48, based on identification of MgII2796,2803 doublet, MnII2606, FeII2600, and MnII2594.
We thank the Gemini staff, in particular J. Holt and J. Kemp, for making these observations possible.
GCN Circular #13514
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester) and P.D'Avanzo report on behalf of the Swift-XRT team:
We have analysed 6.4 ks of XRT data for GRB 120724A (D'Avanzo et al. GCN Circ. 13510), from 115 s to 13.0 ks after the BAT trigger. The data comprise 40 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 245.1800, 3.5081 which is equivalent to:
```
RA (J2000): 16 20 43.19
Dec(J2000): +03 30 29.0
```
with an uncertainty of 2.2 arcsec (radius, 90% confidence).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.78 (+/-0.22), followed by a break at T+851 s to an alpha of 0.48 (+0.18, -0.79).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.88 (+0.20, -0.09). The best-fitting absorption column is consistent with the Galactic value of 4.3 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 3.7 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 4.3 x 10^20 cm^-2
Intrinsic column:    0 (+9.3, -0) x 10^20 cm^-2 at z=1.48
Photon index:	     1.88 (+0.20, -0.09)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00528443.
This circular is an official product of the Swift-XRT team.
GCN Circular #13515
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 2299 s of XRT Photon Counting mode data and 4 UVOT images for GRB 120724A, 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 = 245.18020, +3.50793 which is equivalent to:
```
RA (J2000): 16h 20m 43.25s
Dec (J2000): +03d 30' 28.6"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #13516
S. T. Holland (STScI) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 120724A starting 99 s after the BAT trigger (D'Avanzo et al., 2012, GCNC 13510). Settled observations started at 120 s. We detect a faint source with preliminary coordinates
```
    RA (J2000)  16:20:43.35  =  245.18062 (deg)
   Dec (J2000) +03:30:27.8   =   +3.50772 (deg)
```
and an estimated uncertainty of 0.77 arcsec (radius, 90% confidence, statistical + systematic). This position is consistent with the optical source discovered by Guidorzi et al. (2012, GCNC 13511) and is slightly outside the UVOT-enhanced XRT position (D'Avanzo et al., 2012, GCNC 13514). Preliminary magnitiudes for this source, and 3-sigma upper limits for the finding charts (FC) and the co-added images, are
```
Filter       TSTART       TSTOP  EXPOSURE       Mag   Err  Sigma
----------------------------------------------------------------
white (FC)      117         267       147     >21.3
   u (FC)      330         580       246     >20.5
white (FC)      609         629        20     >19.8
----------------------------------------------------------------
  v            832        1404        72     >19.2
  b            585        1331        58      20.01 0.41    2.7
  u            330        1461       288      20.50 0.37    3.0
uvw1           1088        1453        59     >19.2
uvm2           1237        1429        39     >18.4
uvw2            635        1380        78     >19.5
white           117        1355       199      21.54 0.45    2.5
----------------------------------------------------------------
```
The quoted magnitudes and upper limits have not been corrected for the Galactic extinction along the line of sight to this burst of E_{B-V} = 0.05 mag (Schlafly et al. 2011, ApJS, 737, 103).
GCN Circular #13517
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), P. D'Avanzo (INAF-OAB), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120724A (trigger #528443) (D'Avanzo, et al., GCN Circ. 13510). The BAT ground-calculated position is RA, Dec = 245.193, 3.535 deg which is
```
     RA(J2000)  =  16h 20m 46.3s
     Dec(J2000) = +03d 32' 07.2"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The mask-weighted light curve shows a single broad peak starting at roughly T0-30 seconds, peaking at T0 and extending until T0+100 seconds. T90 (15-350 keV) is 72.8 +- 16.4 sec (estimated error including systematics).
The time-averaged spectrum from -21.3 to 64.5 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.53 +- 1.53, and Epeak of 27.6 +- 7.5 keV (chi squared 43.55 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.8 +- 1.1 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+7.51 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.45 +- 0.26 (chi squared 50.75 for 57 d.o.f.). 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/528443/BA/
GCN Circular #13519
I.A. Smith (Rice U.), R.P.J. Tilanus (JAC), N.R. Tanvir (U. of Leicester), D.A. Frail (NRAO) report:
We observed the location of GRB 120724A (D'Avanzo et al., GCN Circ. 13510) using the SCUBA-2 sub-millimeter continuum camera on the James Clerk Maxwell Telescope. The observation started at 07:48 UT on 2012-07-24, corresponding to 69 minutes after the burst trigger. Exposures totaling 1.7 hours were made in reasonable weather conditions. No source was detected, with a preliminary RMS of 3.3 mJy/beam at 850 microns.
We thank Jeff Cox and Antonio Chrysostomou for their prompt support of these observations.
GCN Circular #13520
A. Pozanenko (IKI), A. Sergeev (Institute of Radio Astronomy of NASU), A. Volnova (SAI MSU), O. Burhonov (UBAI), I. Molotov (KIAM) report on behalf GRB follow-up collaboration:
We observed the field of Swift GRB 120724A (D'Avanzo et al., GCN 13510) with AZT-22 telescope of Maidanak observatory starting on Jul. 24 (UT) 15:55:51 under mean seeing (FWHM) of about 1.1 arcsec. Totally we obtained 4 images of 600 s exposure in R filter. At the edge of the enhanced XRT position (Goad et al., GCN 13515) we detected the object with coordinates (J2000) 16 20 43.28 +03 30 27.1 (uncertainty of 0.12 arcsec in both coordinates), which is slightly apart from coordinates of the OT reported earlier (Guidorzi et al., GCN 13511; Holland et al., GCN 13516). Since the object is also visible in stacked DSS images (R+I) we suggest it is a possible host galaxy of GRB 120724A.
A preliminary photometry of the object is based on USNO-B1.0 nearby stars:
```
T0+        Filter,     Exposure,   OT
(mid, d)                (s)

 0.42252       R    3x600        20.97 +/- 0.09
```
A finding chart can be found at http://grb.rssi.ru/GRB120724A/GRB120724A_AZT22&DSS.png
GCN Report 386.1
GCN_Report 386.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_386_1.pdf by P. DAvanzo at INAF-OAB titled: "Swift Observations of GRB 120724A"
GCN Circular #18183
Xianggao Wang (UC Berkeley, GXU, UNLV), WeiKang Zheng, Alexei V. Filippenko (UC Berkeley), and S. Bradley Cenko (GSFC) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRBs 120422A (Troja et al., GCN 13243), 120724A (D'Avanzo et al., GCN 13510), 120803B (Racusin et al. GCN 13566), 120911A (Cannizzo et al., GCN 13744), and 120923A (Yershov et al., GCN 13796) at 510 s, 202 s, 196 s, 147 s, and 236 s after the burst, respectively. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. We do not detect any new sources within the XRT error circles. We estimate the following upper limits (magnitudes) in clear-band images for each GRB calibrated to USNO B1.0:
```
GRB       Start-Time  Coadd-Images  Mid-time   Upper-Limit (3 sigma)
120422A   510 s        20 s x 6           758 s              20.6
120724A   202 s        20 s x 10         647 s              20.7
120803B   196 s        20 s x 10         644 s              21.7
120911A   147 s        20 s x 6          501 s               20.9
120923A   236 s        20 s x 6          563 s               21.0
```

Back to JG's homepage

Jochen Greiner, last update: 20-Aug-2015 [Disclaimer]