Gamma-ray Burst 110715A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:14:12 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.660d {+15h 50m 38s} (J2000),
                 237.864d {+15h 51m 27s} (current),
                 236.775d {+15h 47m 06s} (1950)
GRB_DEC:         -46.233d {-46d 13' 59"} (J2000),
                 -46.268d {-46d 16' 02"} (current),
                 -46.083d {-46d 04' 56"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1017 [cnts]    Image_Peak=147 [image_cnts]
TRIGGER_DUR:     0.128 [sec] 
TRIGGER_INDEX:   122     E_range: 25-100 keV
BKG_INTEN:       24505 [cnts]
BKG_TIME:        47616.84 SOD {13:13:36.84} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15757 TJD;   196 DOY;   11/07/15
GRB_TIME:        47630.98 SOD {13:13:50.98} UT
GRB_PHI:         -179.10 [deg]
GRB_THETA:        34.11 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     31.33 [sigma]
IMAGE_SIGNIF:    11.86 [sigma]
MERIT_PARAMS:     +1  +0  +0  -3  +2  +1  +0  +1 +61  +0 
SUN_POSTN:       114.53d {+07h 38m 07s}  +21.52d {+21d 31' 24"}
SUN_DIST:        128.21 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.40d {+19h 49m 36s}  -18.11d {-18d 06' 26"}
MOON_DIST:        56.10 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.29,  6.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      245.80,-25.47 [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 = 173.98,-20.44 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:15:55 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.6832d {+15h 50m 43.96s} (J2000),
                 237.8877d {+15h 51m 33.05s} (current),
                 236.7989d {+15h 47m 11.73s} (1950)
GRB_DEC:         -46.2326d {-46d 13' 57.3"} (J2000),
                 -46.2668d {-46d 16' 00.6"} (current),
                 -46.0819d {-46d 04' 55.0"} (1950)
GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.29e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.91 [sigma]
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47721.93 SOD {13:15:21.93} UT,   90.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.21 261.40 243.51
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       114.53d {+07h 38m 07s}  +21.52d {+21d 31' 24"}
SUN_DIST:        128.22 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.41d {+19h 49m 39s}  -18.10d {-18d 06' 12"}
MOON_DIST:        56.10 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      245.82,-25.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.98 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:16:06 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.6832d {+15h 50m 43.9s} (J2000),
                 237.8877d {+15h 51m 33.0s} (current),
                 236.7989d {+15h 47m 11.7s} (1950)
GRB_DEC:         -46.2326d {-46d 13' 57.3"} (J2000),
                 -46.2668d {-46d 16' 00.6"} (current),
                 -46.0819d {-46d 04' 55.0"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       35 [cnts]
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47721.93 SOD {13:15:21.93} UT,   90.9 [sec] since BAT Trigger Time
CENTROID_X:      332.91,  raw= 333  [pixels]
CENTROID_Y:      340.75,  raw= 341  [pixels]
ROLL:            261.66 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   100.79
GRB_POS_XRT_Z:   68.87
IMAGE_URL:       sw00457330000msxps_rw.img
SUN_POSTN:       114.53d {+07h 38m 07s}  +21.52d {+21d 31' 24"}
SUN_DIST:        128.22 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.42d {+19h 49m 40s}  -18.10d {-18d 06' 10"}
MOON_DIST:        56.10 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      245.82,-25.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:16:17 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.6832d {+15h 50m 43.9s} (J2000),
                 237.8877d {+15h 51m 33.0s} (current),
                 236.7989d {+15h 47m 11.7s} (1950)
GRB_DEC:         -46.2326d {-46d 13' 57.3"} (J2000),
                 -46.2668d {-46d 16' 00.6"} (current),
                 -46.0819d {-46d 04' 55.0"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       35 [cnts]
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47721.93 SOD {13:15:21.93} UT,   90.9 [sec] since BAT Trigger Time
CENTROID_X:      332.91,  raw= 333  [pixels]
CENTROID_Y:      340.75,  raw= 341  [pixels]
ROLL:            261.66 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   100.79
GRB_POS_XRT_Z:   68.87
IMAGE_URL:       sw00457330000msxps_rw.img
SUN_POSTN:       114.53d {+07h 38m 07s}  +21.52d {+21d 31' 24"}
SUN_DIST:        128.22 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.42d {+19h 49m 40s}  -18.10d {-18d 06' 09"}
MOON_DIST:        56.10 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      245.82,-25.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:17:46 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.660d {+15h 50m 38s} (J2000),
                 237.864d {+15h 51m 27s} (current),
                 236.775d {+15h 47m 06s} (1950)
GRB_DEC:         -46.233d {-46d 13' 59"} (J2000),
                 -46.268d {-46d 16' 02"} (current),
                 -46.083d {-46d 04' 56"} (1950)
GRB_DATE:        15757 TJD;   196 DOY;   11/07/15
GRB_TIME:        47630.98 SOD {13:13:50.98} UT
TRIGGER_INDEX:   122
GRB_PHI:         -179.10 [deg]
GRB_THETA:        34.11 [deg]
DELTA_TIME:      25.00 [sec]
TRIGGER_DUR:     0.128 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     31.33 [sigma]
IMAGE_SIGNIF:    11.86 [sigma]
LC_URL:          sw00457330000msb.lc
SUN_POSTN:       114.53d {+07h 38m 08s}  +21.52d {+21d 31' 23"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.43d {+19h 49m 43s}  -18.10d {-18d 05' 56"}
MOON_DIST:        56.13 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.29,  6.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      245.80,-25.47 [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 = 173.98,-20.44 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:19:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.650d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.208d {-46d 12' 29"} (J2000)
POINT_ROLL:      261.664d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47730.51 SOD {13:15:30.51} UT,   99.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.825
N_STARS:         190
X_OFFSET:        368 [pixels]
Y_OFFSET:        392 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1351 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00457330000msufc0099.fits
SUN_POSTN:       114.53d {+07h 38m 08s}  +21.52d {+21d 31' 22"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.44d {+19h 49m 46s}  -18.10d {-18d 05' 45"}
MOON_DIST:        56.14 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:19:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.650d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.208d {-46d 12' 29"} (J2000)
POINT_ROLL:      261.664d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47730.51 SOD {13:15:30.51} UT,   99.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.825
N_STARS:         190
X_OFFSET:        368 [pixels]
Y_OFFSET:        392 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1351 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00457330000msufc0099.fits
SUN_POSTN:       114.53d {+07h 38m 08s}  +21.52d {+21d 31' 22"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.45d {+19h 49m 47s}  -18.10d {-18d 05' 41"}
MOON_DIST:        56.15 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [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:     Fri 15 Jul 11 13:20:59 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.650d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.208d {-46d 12' 29"} (J2000)
ROLL:            261.664d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47730.51 SOD {13:15:30.51} UT,   99.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     332428537
X_OFFSET:        579 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       739
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00457330000msuni0107.fits
SUN_POSTN:       114.53d {+07h 38m 08s}  +21.52d {+21d 31' 22"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.46d {+19h 49m 51s}  -18.09d {-18d 05' 29"}
MOON_DIST:        56.16 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [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:     Fri 15 Jul 11 13:21:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.650d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.208d {-46d 12' 29"} (J2000)
ROLL:            261.664d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47730.51 SOD {13:15:30.51} UT,   99.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     332428537
X_OFFSET:        579 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       739
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00457330000msuni0107.fits
SUN_POSTN:       114.53d {+07h 38m 08s}  +21.52d {+21d 31' 22"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.46d {+19h 49m 51s}  -18.09d {-18d 05' 27"}
MOON_DIST:        56.16 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [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:     Fri 15 Jul 11 13:22:17 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     457330,   Seg_Num: 0
GRB_RA:          237.6836d {+15h 50m 44.06s} (J2000),
                 237.8882d {+15h 51m 33.15s} (current),
                 236.7993d {+15h 47m 11.82s} (1950)
GRB_DEC:         -46.2351d {-46d 14' 06.3"} (J2000),
                 -46.2693d {-46d 16' 09.6"} (current),
                 -46.0845d {-46d 05' 04.0"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         17.34 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47730.00 SOD {13:15:30.00} UT,   99.0 [sec] since BAT Trigger Time
SUN_POSTN:       114.54d {+07h 38m 08s}  +21.52d {+21d 31' 21"}
SUN_DIST:        128.22 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.47d {+19h 49m 53s}  -18.09d {-18d 05' 18"}
MOON_DIST:        56.15 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      245.82,-25.47 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 8.6 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:25:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.651d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.206d {-46d 12' 21"} (J2000)
POINT_ROLL:      261.665d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47942.49 SOD {13:19:02.49} UT,   311.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.904
N_STARS:         190
X_OFFSET:        259 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1218 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00457330000msufc0311.fits
SUN_POSTN:       114.54d {+07h 38m 09s}  +21.52d {+21d 31' 20"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.51d {+19h 50m 01s}  -18.08d {-18d 04' 49"}
MOON_DIST:        56.20 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Jul 11 13:26:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.651d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.206d {-46d 12' 21"} (J2000)
POINT_ROLL:      261.665d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47942.49 SOD {13:19:02.49} UT,   311.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.904
N_STARS:         190
X_OFFSET:        259 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1218 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00457330000msufc0311.fits
SUN_POSTN:       114.54d {+07h 38m 09s}  +21.52d {+21d 31' 20"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.51d {+19h 50m 02s}  -18.08d {-18d 04' 46"}
MOON_DIST:        56.20 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #12158
E. Sonbas (GSFC/USRA/Adiyaman Univ.), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), V. D'Elia (ASDC), M. De Pasquale (UCL-MSSL), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), S. R. Oates (UCL-MSSL), C. Pagani (U Leicester), K. L. Page (U Leicester), P. Romano (INAF-IASFPA), A. Rowlinson (U Leicester), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), G. Stratta (ASDC), C. A. Swenson (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 13:13:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110715A (trigger=457330). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 237.660, -46.233 which is
```
   RA(J2000) = 15h 50m 38s
   Dec(J2000) = -46d 13' 59"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 15 sec. The peak count rate was ~70,000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 13:15:21.9 UT, 90.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 237.6832, -46.2326 which is equivalent to:
```
   RA(J2000)  = 15h 50m 43.96s
   Dec(J2000) = -46d 13' 57.3"
```
with an uncertainty of 5.8 arcseconds (radius, 90% containment). This location is 57 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.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 99 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	15:50:44.09 = 237.68370
  DEC(J2000) = -46:14:06.5  = -46.23513
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 9.2 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.34 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.59.
Burst Advocate for this burst is E. Sonbas (eda.sonbas 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:     Fri 15 Jul 11 13:27:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.651d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.206d {-46d 12' 21"} (J2000)
ROLL:            261.665d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47942.49 SOD {13:19:02.49} UT,   311.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     332428749
X_OFFSET:        579 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       739
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00457330000msuni0319.fits
SUN_POSTN:       114.54d {+07h 38m 09s}  +21.52d {+21d 31' 19"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.52d {+19h 50m 04s}  -18.08d {-18d 04' 37"}
MOON_DIST:        56.21 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [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:     Fri 15 Jul 11 13:27:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     457330,   Seg_Num: 0
POINT_RA:        237.651d {+15h 50m 36s} (J2000)
POINT_DEC:       -46.206d {-46d 12' 21"} (J2000)
ROLL:            261.665d
IMG_START_DATE:  15757 TJD;   196 DOY;   11/07/15
IMG_START_TIME:  47942.49 SOD {13:19:02.49} UT,   311.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     332428749
X_OFFSET:        579 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       739
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00457330000msuni0319.fits
SUN_POSTN:       114.54d {+07h 38m 09s}  +21.52d {+21d 31' 19"}
SUN_DIST:        128.20 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      297.52d {+19h 50m 05s}  -18.08d {-18d 04' 35"}
MOON_DIST:        56.21 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      332.30,  6.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      245.79,-25.45 [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 #12160
T. N. Ukwatta (MSU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), E. Sonbas (GSFC/USRA/Adiyaman Univ.), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110715A (trigger #457330) (Sonbas, et al., GCN Circ. 12158). The BAT ground-calculated position is RA, Dec = 237.665, -46.237 deg, which is
```
   RA(J2000)  =  15h 50m 39.7s 
   Dec(J2000) = -46d 14' 13.9" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 69%.
The mask-weighted light curve shows a bright first peak, which is composed of at least 2 overlapping peaks (at the lower energies), starting at ~T-10 sec and peaking at ~T+2.5 sec. the first peak never returns to basline before the second and much weaker peak goes from ~T+12 to T+17 sec. T90 (15-350 keV) is 13.0 +- 4.0 sec (estimated error including systematics).
The time-averaged spectrum from T-3.1 to T+20.9 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.25 +- 0.12, and Epeak of 120 +- 21 keV (chi squared 49.6 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.18 +- 0.02 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+1.86 sec in the 15-150 keV band is 53.9 +- 1.1 ph/cm2/sec. To within the calibration limits, the Band model fits equally well. A fit to a simple power law gives a photon index of 1.63 +- 0.03 (chi squared 81.5 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/457330/BA/
GCN Circular #12161
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 120 s of XRT Photon Counting mode data and 1 UVOT images for GRB 110715A, 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 = 237.68361, -46.23583 which is equivalent to:
```
RA (J2000): 15h 50m 44.07s
Dec (J2000): -46d 14' 09.0"
```
with an uncertainty of 2.2 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.

GCN Circular #12162
N.P.M. Kuin (MSSL-UCL) and E. Sonbas (GSFC/USRA/Adiyaman Univ.) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110715A 100 s after the BAT trigger (Sonbas et al., GCN Circ. 12158).
The preliminary UVOT position is:

  RA  (J2000) =  15:50:44.09 = 237.68369 (deg.)
  Dec (J2000) = -46:14:06.53 = -46.23515 (deg.)

with an estimated uncertainty of 0.56 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              100          249          147         17.37 +/- 0.06
u                  312          501          187         17.86 +/- 0.09
b                 3734         3857          121         19.5  +/- 0.3
white             3960         4160          197         19.92 +/- 0.16
uvw2              4166         4366          197        >20.1
v                 4371         4571          197         19.3  +/- 0.3
uvm2              4576         6211          393        >20.3
uvw1              4781         6280          259        >20.1
u                 4986         5186          197         20.1  +/- 0.4
b                 5192         5391          197         19.9  +/- 0.2

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.59 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #12164
S. Piranomonte (OAR/INAF), S. D. Vergani (OAB/INAF), D. Malesani, J. P. U. Fynbo (DARK/NBI), K. Wiersema (Leicester), L. Kaper (Amsterdam) report on behalf of the X-shooter GRB GTO collaboration:
We observed the optical afterglow of GRB 110715A (Sonbas et al., GCN Circ. 12158) with the ESO VLT equipped with the X-shooter spectrograph.
The optical afterglow is well detected in the R-band acquisition image (taken on Jul 16.06 UT, i.e. 12.3 hr after the GRB), and has a magnitude of R = 18.45 assuming R=15.21 for the USNO-B1 star at RA = 15:50:41.62, Dec = -46:14:25.91.
Spectroscopic observations lasted for about 10 minutes, with a mean time 2011 Jul 16.08 UT (12.7 hr after the GRB). The seeing was about 0.9". We then had to interrupt our observations due to strong wind.
We detect Ca II and Ca I absorption lines at a common redshift of z=0.82. The wavelength calibration is based on archival calibration files.
We acknowledge excellent support from the night astronomer at the VLT, Christophe Martayan, the telescope operator, Claudia Cid, and the shift leader, Jonathan Smoker.
GCN Circular #12165
P.A. Evans (U. Leicester) and E. Sonbas (GSFC/USRA/Adiyaman Univ.) report on behalf of the Swift-XRT team:
We have analysed 4.2 ks of XRT data for GRB 110715A (Sonbas et al. GCN Circ. 12158), from 79 s to 29.4 ks after the BAT trigger. The data comprise 400 s in Windowed Timing (WT) mode (the first 10 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 12161).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.57 (+/-0.05), followed by a break at T+2415 s to an alpha of 1.78 (+/-0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.91 (+/-0.07). The best-fitting absorption column is 4.7 (+0.4, -0.3) x 10^21 cm^-2, in excess of the Galactic value of 2.9 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.85 (+/-0.13) and a best-fitting absorption column of 6.0 (+/-0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.3 x 10^-11 (8.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.0 (+/-0.8) x 10^21 cm^-2
Galactic foreground: 2.9 x 10^21 cm^-2
Excess significance: 12.6 sigma
Photon index:	     1.85 (+/-0.13)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00457330.
This circular is an official product of the Swift-XRT team.
GCN Circular #12166
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The bright GRB 110715A (Swift-BAT trigger #457330: Sonbas et al., GCN 12158; Ukwatta et al., GCN 12160) triggered Konus-Wind at T0=3D47635.304s UT (13:13:55.304)
The burst light curve shows a bright pulse, which peaked at T0+2s, and a much weaker pulse at ~T0+11s. A total burst duration is ~20 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB110715_T47635/
As observed by Konus-Wind the burst had a fluence of (2.3 =B1 0.2)x10-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.984 s, of (1.1 =B1 0.1)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+18.432 s) is best fitted in the 20 keV - 10 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha =3D -1.23 (-0.08, +0.09), the high energy photon index beta =3D -2.7 (-0.5, +0.2), the peak energy Ep =3D 120(-11, +12) keV, chi2 =3D 85.8/84 dof.
The spectrum at the maximum count rate (measured from T0+0.256 to T0+2.048 s) is best fitted in the 20 keV - 10 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha =3D -1.05 (-0.11, +0.11), the high energy photon index beta =3D -3.6 (<-3.0), the peak energy Ep =3D 148(-10, +11) keV, chi2 =3D 51.5/55 dof.
Assuming the VLT redshift z =3D 0.82 (Piranomonte et al., GCN 12164) and a standard cosmology model with H_0 =3D 71 km/s/Mpc, Omega_M =3D 0.27, Omega_Lambda =3D 0.73, the isotropic energy release E_iso is (4.1 =B1 0.4)x10^52 erg, the peak luminosity L_iso_max is (3.9 =B1 0.2)x10^52 erg/s, and Ep_rest is 220 =B1 20 keV.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level
GCN Circular #12168
A. de Ugarte Postigo (DARK/NBI), A. Lundgren, F. Mac-Auliffe, F.M. Montenegro, D.A. Garc=EDa-Appadoo, I. de Gregorio-Monsalvo, S. Martin, C. De Breuk (ESO), P. Bergman, M. Hajigholi (OSO), C.C. Thoene, J. Gorosabel, A.J. Castro-Tirado (IAA-CSIC), J.P.U. Fynbo (DARK/NBI) and S. Covino (INAF-OAB) report on behalf of a larger collaboration:
We have observed the field of GRB 110715A (Sonbas et al. GCN 12158) using LABOCA/APEX at Chajnantor (Chile) in the 870 micrometer band. The weather conditions were good, with a precipitable water vapor of 0.62mm. Observations began on July 16 at 23:21 UT (1.42 days after the burst) and were performed using the photometric mode, centred at the position of the optical counterpart (Kuin et al. GCN 12162, Piranomonte et al. GCN 12164).
On a preliminary analysis of 88 minutes on source we detect a flux at the position of the afterglow of 11.0+/-2.3 mJy.
Further observations are foreseen. We encourage follow-up in other wavelengths.
GCN Circular #12169
A. C. Updike (NASA/GSFC), P. Schady, J. Greiner (both MPE Garching), T. Kruehler (DARK/NBI), D. A. Kann, S. Klose and A. Rossi (all TLS Tautenburg) report on behalf of the GROND team:
We observed the field of GRB 110715A (Swift trigger 457330; Sonbas et al., GCN #12158) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 00:35 UT on 18th July, lasting just under 2hrs and with a midtime ~3dys after the GRB trigger. They were performed at an average seeing of 1.1" and at an average airmass of 1.
We found a single point source within the 2.2" Swift-XRT error circle reported by Evans et al. (GCN #12161), consistent with the UVOT position (Kuin et al., GCN #12162).
Based on 4136s of total exposures in g'r'i'z' and 4320s in JHK, we estimate preliminary magnitudes (all AB system) of
```
g' = 22.59 +/- 0.09
r' = 21.22 +/- 0.02
i' = 20.53 +/- 0.02
z' = 19.93 +/- 0.02
J =  19.56 +/- 0.24
H =  18.79 +/- 0.17
K =  18.86 +/- 0.31
```
Given optical and NIR magnitudes are calibrated against GROND zeropoints and 2MASS field stars, respectively, and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E(B-V)=0.60 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #12171
Paul J. Hancock, Tara Murphy (U of Sydney) and Brian P. Schmidt (ANU)
We observed GRB 110715A (GCN 12158) with the Australian Telescope Compact Array (ATCA) on July 18 at 12.2 UT (~3 days after the GRB trigger).
We find a single unresolved radio source consistent with the UVOT position (GCN 12162). The source has a measured flux density of 2.4 +/- 0.1 mJy/beam at 44.00 GHz.
Further observations are planned. We thank the observatory staff for scheduling and supporting these observations.
GCN Circular #12174
Peter Nelson (Ellinbank, Victoria, Australia) reported to the AAVSO International High Energy Network the following optical observations of GRB 110715A (Sonbas et al., GCN #12158):
P. Nelson (Ellinbank Observatory, Ellinbank, VIC, Australia) reports a detection of GRB 110715A from fifteen frames of 30-seconds exposure each taken with a clear filter through a 0.32-cm PlaneWave f/8 CDK and SBIG ST8XE camera. The magnitude derived from all frames is m(CR) = 18.0 +/- 0.2 at the mid-point exposure time of 2011 July 15 14:05:01 UT. Magnitudes were measured relative to the USNO-B1.0 comparison star at RA: 15:50:41.62, Decl: -46:14:25.91 with magnitude R=15.21 (see Piranomonte et al., GCN #12164).
Nelson reports that time-series was obtained by averaging the 15 frames into three consecutive groups of five frames, yielding the following magnitudes:
```
Time (UT)	Mag (Clear, R zeropoint)
13:54:23	18.01 +/- 0.18
14:05:28	17.93 +/- 0.15
14:15:12	18.47 +/- 0.25
```
The position derived from these images is RA: 15:50:44.07, Decl: -46:14:06.5, which is fully consistent with the optical position given by Kuin et al. (GCN #12162).
The AAVSO International High Energy Network was made possible through grants from the Charles Curry Foundation and from NASA.
GCN Circular #12184
N. Ohmori, M. Akiyama, M. Yamauchi (Univ. of Miyazaki), K. Yamaoka (Aoyama Gakuin U.), M. Ohno, Y. Hanabata, T. Uehara, T. Takahashi, M. Mizuno, Y. Fukazawa (Hiroshima U.), S. Sugita (Nagoya U.), T. Yasuda, Y. Terada, W. Iwakiri, K. Takahara, M. Asahina, S. Kobayashi, M. Tashiro (Saitama U.), M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa (Waseda U.), Y. Urata, P. Tsai, C-J. Chuang (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo), on behalf of the Suzaku WAM team, report:
The long GRB 110715A (Swift/BAT trigger #457330 ; Sonbas et al., GCN 12158) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 13:13:49.914 UT (=T0).
The observed light curve shows a multi-peaked structure starting at T0, ending at T0+4s, followed by a weaker emission seen up to T0+20s with a duration (T90) of 8 seconds. The fluence in 100 - 1000 keV was 1.28 (-0.06, +0.07) x10^-5 erg/cm^2. The 1-s peak flux measured from T0+3s was 20.3 (-1.1, +1.0) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-3s to T0+20s is well fitted by a single power-law with a photon index of 2.67 (-0.18, +0.19) (chi^2/d.o.f = 24.0/15). All the quoted errors are at statistical 90% confidence level.
The light curves for this burst will be available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #12185
D. Xu (WIS) reports:
GRB 110715A was detected by Swift/BAT (Sonbas et al., GCN 12158; Ukwatta et al., GCN 12160), Konus-Wind (Golenetskii et al., GCN 12166), and Suzaku/WAM (Ohmori et al., GCN 12184). The prompt emission of this burst has a high photon count rate. And the lightcurve shows a multi-peaked structure lasting ~5s (i.e., T0+5s, where T0 is the trigger time), followed by a much weaker emission up to ~T0+20s. Therefore, the overall T90 duration is ~10s or even a bit longer. On the other hand, such a lightcurve feature is reminiscent of previous short bursts with extended tail emissions.
With the redshift z =3D 0.82 (Piranomonte et al., GCN 12164) and the cosmological parameters H_0 =3D 71 km/s/Mpc, Omega_M =3D 0.27, Omega_Lambda =3D 0.73, the isotropic energy release E_iso is (4.1 =B1 0.4)x10^52 erg, the isotropic peak luminosity L_iso,p is (3.9 =B1 0.2)x10^52 erg/s, and the rest-frame \nu_F\nu peak energy Ep_rest is 220 =B1 20 keV (Golenetskii et al., GCN 12166). Thus, the values of Eiso and Ep_rest are well consistent with the Eiso-Ep_rest relation (i.e., Amati relation) for long GRBs (or collapsar bursts).
The Swift/BAT data were reduced in a standard way and a CCF method was used to derive spectral lags upon the lightcurves with 0.064s binning (Xu et al., ApJ, 696, 971). We found lags of 0.04+/-0.01s (1sigma) for 15-25 V.S. 25-50 keV and 0.04+/-0.01 (1sigma) for 50-75 V.S. 75-350 keV. Thus, this event also fits the Liso-spectral lag relation for long GRBs.
At z=0.82, searching for an accompanying SN is doable but requires very deep photometric follow-ups (ref. Tanvir et al., ApJ, 725, 625).
GCN Report 340.1
GCN_Report 340.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_340_1.pdf by E. Sonbas at GSFC/USRA/Adiyaman U. titled: "Final Swift Observations of GRB 110715A"

Back to JG's homepage

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