Gamma-ray Burst 120711A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 11 Jul 12 02:45:03 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    6599,   Sub_Num: 0
GRB_RA:          94.7055d {+06h 18m 49s} (J2000),
                 94.6639d {+06h 18m 39s} (current),
                 94.8707d {+06h 19m 29s} (1950)
GRB_DEC:        -71.0124d {-71d 00' 44"} (J2000),
                -71.0181d {-71d 01' 04"} (current),
                -70.9892d {-70d 59' 20"} (1950)
GRB_ERROR:      3.12 [arcmin, radius, statistical only]
GRB_INTEN:      9.32 [sigma]
GRB_TIME:       9895.29 SOD {02:44:55.29} UT
GRB_DATE:       16119 TJD;   193 DOY;   12/07/11
SC_RA:           64.84 [deg] (J2000)
SC_DEC:         -71.14 [deg] (J2000)
SUN_POSTN:      110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:        93.76 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:      16.83d {+01h 07m 20s}  +11.11d {+11d 06' 51"}
MOON_DIST:       96.60 [deg]
GAL_COORDS:     281.50,-28.18 [deg] galactic lon,lat of the burst
ECL_COORDS:     251.25,-85.24 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=0.1599 and Time_Error=2.0000.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=363667496).  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 11 Jul 12 02:46:05 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6599,   Sub_Num: 1
GRB_RA:          94.6898d {+06h 18m 46s} (J2000),
                 94.6484d {+06h 18m 36s} (current),
                 94.8545d {+06h 19m 25s} (1950)
GRB_DEC:        -71.0002d {-71d 00' 00"} (J2000),
                -71.0059d {-71d 00' 20"} (current),
                -70.9771d {-70d 58' 36"} (1950)
GRB_ERROR:      2.62 [arcmin, radius, statistical only]
GRB_INTEN:      21.88 [sigma]
GRB_TIME:       9959.60 SOD {02:45:59.60} UT
GRB_DATE:       16119 TJD;   193 DOY;   12/07/11
SC_RA:           64.84 [deg] (J2000)
SC_DEC:         -71.14 [deg] (J2000)
SUN_POSTN:      110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:        93.75 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:      16.84d {+01h 07m 22s}  +11.12d {+11d 07' 01"}
MOON_DIST:       96.60 [deg]
GAL_COORDS:     281.49,-28.18 [deg] galactic lon,lat of the burst
ECL_COORDS:     251.25,-85.25 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(66.0<100sec) coincident with the FERMI_GBM event (trignum=363667496).  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:45:23 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     363667496
GRB_RA:           69.633d {+04h 38m 32s} (J2000),
                  69.666d {+04h 38m 40s} (current),
                  69.503d {+04h 38m 01s} (1950)
GRB_DEC:         -62.883d {-62d 52' 59"} (J2000),
                 -62.859d {-62d 51' 32"} (current),
                 -62.980d {-62d 58' 49"} (1950)
GRB_ERROR:       8.45 [deg radius, statistical plus systematic]
GRB_INTEN:       270 [cnts/sec]
DATA_SIGNIF:     7.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          70.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.49
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:         90.90 [deg]   Sun_angle= 2.7 [hr] (West of Sun)
MOON_POSTN:       16.83d {+01h 07m 20s}  +11.11d {+11d 06' 54"}
MOON_DIST:        84.32 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      273.59,-38.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.47,-80.61 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.43,-1.68 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:45:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     363667496
GRB_RA:           65.733d {+04h 22m 56s} (J2000),
                  65.739d {+04h 22m 57s} (current),
                  65.713d {+04h 22m 51s} (1950)
GRB_DEC:         -67.700d {-67d 42' 00"} (J2000),
                 -67.671d {-67d 40' 16"} (current),
                 -67.814d {-67d 48' 51"} (1950)
GRB_ERROR:       7.90 [deg radius, statistical plus systematic]
GRB_INTEN:       241 [cnts/sec]
DATA_SIGNIF:     11.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          79.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:         95.66 [deg]   Sun_angle= 3.0 [hr] (West of Sun)
MOON_POSTN:       16.84d {+01h 07m 20s}  +11.12d {+11d 06' 55"}
MOON_DIST:        86.17 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      280.11,-38.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      342.01,-80.56 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.43,-1.68 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:46:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      120
TRIGGER_NUM:     363667496
GRB_RA:           56.483d {+03h 45m 56s} (J2000),
                  56.526d {+03h 46m 06s} (current),
                  56.313d {+03h 45m 15s} (1950)
GRB_DEC:         -63.683d {-63d 40' 59"} (J2000),
                 -63.645d {-63d 38' 40"} (current),
                 -63.837d {-63d 50' 14"} (1950)
GRB_ERROR:       5.68 [deg radius, statistical plus systematic]
GRB_INTEN:       511 [cnts/sec]
DATA_SIGNIF:     21.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          80.00 [deg]
GRB_THETA:       150.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.55
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:         95.53 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:       16.84d {+01h 07m 23s}  +11.12d {+11d 07' 05"}
MOON_DIST:        80.65 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      277.78,-43.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      355.93,-75.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.43,-1.68 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:46:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      124
TRIGGER_NUM:     363667496
GRB_RA:           56.717d {+03h 46m 52s} (J2000),
                  56.760d {+03h 47m 02s} (current),
                  56.544d {+03h 46m 11s} (1950)
GRB_DEC:         -63.500d {-63d 30' 00"} (J2000),
                 -63.462d {-63d 27' 41"} (current),
                 -63.653d {-63d 39' 10"} (1950)
GRB_ERROR:       3.80 [deg radius, statistical plus systematic]
GRB_INTEN:       1874 [cnts/sec]
DATA_SIGNIF:     78.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          80.00 [deg]
GRB_THETA:       150.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.51
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:         95.33 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:       16.84d {+01h 07m 23s}  +11.12d {+11d 07' 06"}
MOON_DIST:        80.58 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      277.49,-43.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      356.78,-75.80 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.43,-1.68 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:47:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     363667496
GRB_RA:           79.920d {+05h 19m 41s} (J2000),
                  79.921d {+05h 19m 41s} (current),
                  79.918d {+05h 19m 40s} (1950)
GRB_DEC:         -66.750d {-66d 45' 00"} (J2000),
                 -66.738d {-66d 44' 15"} (current),
                 -66.799d {-66d 47' 54"} (1950)
GRB_ERROR:       2.92 [deg radius, statistical only]
DATA_SIGNIF:     13.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:       140.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       110.80d {+07h 23m 11s}  +22.06d {+22d 03' 39"}
SUN_DIST:         91.77 [deg]   Sun_angle= 2.1 [hr] (West of Sun)
MOON_POSTN:       16.85d {+01h 07m 24s}  +11.12d {+11d 07' 10"}
MOON_DIST:        90.10 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      277.00,-33.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.66,-86.01 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:48:45 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      119
TRIGGER_NUM:     363667496
GRB_RA:          169.830d {+11h 19m 19s} (J2000),
                 169.959d {+11h 19m 50s} (current),
                 169.317d {+11h 17m 16s} (1950)
GRB_DEC:         -68.530d {-68d 31' 47"} (J2000),
                 -68.599d {-68d 35' 54"} (current),
                 -68.256d {-68d 15' 21"} (1950)
GRB_ERROR:       3.23 [deg radius, statistical only]
DATA_SIGNIF:     16.10 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          96.00 [deg]
GRB_THETA:       112.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       110.80d {+07h 23m 12s}  +22.06d {+22d 03' 38"}
SUN_DIST:        100.16 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:       16.86d {+01h 07m 27s}  +11.12d {+11d 07' 26"}
MOON_DIST:       119.93 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      294.63, -7.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.79,-61.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(72.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=6599).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jul 12 02:48:50 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      122
TRIGGER_NUM:     363667496
GRB_RA:           77.180d {+05h 08m 43s} (J2000),
                  77.186d {+05h 08m 45s} (current),
                  77.158d {+05h 08m 38s} (1950)
GRB_DEC:         -66.290d {-66d 17' 23"} (J2000),
                 -66.275d {-66d 16' 27"} (current),
                 -66.352d {-66d 21' 06"} (1950)
GRB_ERROR:       1.12 [deg radius, statistical only]
DATA_SIGNIF:     74.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16119 TJD;   193 DOY;   12/07/11
GRB_TIME:        9893.29 SOD {02:44:53.29} UT
GRB_PHI:          78.00 [deg]
GRB_THETA:       141.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       110.80d {+07h 23m 12s}  +22.06d {+22d 03' 38"}
SUN_DIST:         91.91 [deg]   Sun_angle= 2.2 [hr] (West of Sun)
MOON_POSTN:       16.86d {+01h 07m 27s}  +11.12d {+11d 07' 27"}
MOON_DIST:        88.92 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      276.70,-34.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      357.13,-84.87 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(72.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=6599).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 11 Jul 12 02:47:11 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6599,   Sub_Num: 0
GRB_INTEN:      21.62 [sigma]
GRB_TIME:       9965.25 SOD {02:46:05.25} UT
GRB_DATE:       16119 TJD;   193 DOY;   12/07/11 
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.4000 and Time_Error=0.2000.  
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(72.0<100sec) coincident with the FERMI_GBM event (trignum=363667496).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2012-07/2012-07-11T02-46-05.1415-31363-39824-0.lc

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 11 Jul 12 02:48:03 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6599,   Sub_Num: 2
GRB_RA:          94.6872d {+06h 18m 45s} (J2000),
                 94.6458d {+06h 18m 35s} (current),
                 94.8520d {+06h 19m 24s} (1950)
GRB_DEC:        -71.0012d {-71d 00' 03"} (J2000),
                -71.0069d {-71d 00' 24"} (current),
                -70.9781d {-70d 58' 40"} (1950)
GRB_ERROR:      2.57 [arcmin, radius, statistical only]
GRB_INTEN:      27.43 [sigma]
GRB_TIME:       9990.60 SOD {02:46:30.60} UT
GRB_DATE:       16119 TJD;   193 DOY;   12/07/11
SC_RA:           64.84 [deg] (J2000)
SC_DEC:         -71.14 [deg] (J2000)
SUN_POSTN:      110.80d {+07h 23m 11s}  +22.06d {+22d 03' 38"}
SUN_DIST:        93.75 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:      16.86d {+01h 07m 25s}  +11.12d {+11d 07' 20"}
MOON_DIST:       96.60 [deg]
GAL_COORDS:     281.49,-28.19 [deg] galactic lon,lat of the burst
ECL_COORDS:     251.26,-85.25 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(97.0<100sec) coincident with the FERMI_GBM event (trignum=363667496).  
COMMENTS:       Possibly real GRB event

GCN Circular #13430
A. Lacluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, H. T. Cromartie, R. Egger, A. Foster, N. Frank, M. Nysewander, A. Oza, E. Speckhard, A.Trotter, and J. A. Crain report:
Skynet observed the field of GRB12711 (INTEGRAL trigger 6599) in B, V, and R starting 37 seconds after the burst. Although no afterglow was detected in the initial exposures, a transient source was detected at 06:18:42.839 -70:59:56.78 (J2000). The source rapidly brightened, peaking at roughly 112 seconds after the trigger. Preliminary peak magnitudes, calibrated to ~5 UNSO B1.0 stars are as follows:
```
Time	Tel	Filt	Mag	1sigERR
112	P4	R	12.117	0.008 
113	P1	V	12.593	0.014
116	P3	B	14.061	0.014
```
The post-peak temporal index is estimated to be -2.1, suggesting a reverse shock.
Further observations are ongoing.
GCN Circular #13432
W. Zheng (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 120711A (Integral trigger 6599). The first image was at 02:45:54.4 UT, 59.1 s after the burst (5.4 s after the GCN notice time). We also detected the suggested optical afterglow found by Skynet/PROMPT (Lacluyze et al., GCN 13430). The afterglow is detected in our first co-add image with Mag ~14.2 (mean time of ~60s) and decayed fainter than 15.8 mag in the second co-add (mean time of 460s). The unfiltered images are calibrated relative to USNO A2.0.
Continuing observations are in progress.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 11 Jul 12 04:08:25 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6599,   Sub_Num: 3
GRB_RA:          94.7026d {+06h 18m 49s} (J2000),
                 94.6612d {+06h 18m 39s} (current),
                 94.8673d {+06h 19m 28s} (1950)
GRB_DEC:        -71.0010d {-71d 00' 03"} (J2000),
                -71.0067d {-71d 00' 23"} (current),
                -70.9778d {-70d 58' 39"} (1950)
GRB_ERROR:      1.10 [arcmin, radius, statistical only]
GRB_INTEN:      27.43 [sigma]
GRB_TIME:       9990.60 SOD {02:46:30.60} UT
GRB_DATE:       16119 TJD;   193 DOY;   12/07/11
SC_RA:           64.84 [deg] (J2000)
SC_DEC:         -71.14 [deg] (J2000)
SUN_POSTN:      110.85d {+07h 23m 25s}  +22.05d {+22d 03' 11"}
SUN_DIST:        93.75 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:      17.50d {+01h 10m 01s}  +11.34d {+11d 20' 14"}
MOON_DIST:       96.60 [deg]
GAL_COORDS:     281.49,-28.18 [deg] galactic lon,lat of the burst
ECL_COORDS:     251.21,-85.25 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(97.0<100sec) coincident with the FERMI_GBM event (trignum=363667496).  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #13433
A. Lacluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, H. T. Cromartie, R. Egger, A. Foster, N. Frank, M. Nysewander, A. Oza, E. Speckhard, A.Trotter, and J. A. Crain report:
Skynet continued to observe the field of GRB120711A (INTEGRAL trigger 6599, GCN 13430 and 13432.) A preliminary light curve in B, V, and R, calibrated to ~5 USNO B1.0 stars can be found at:
http://skynet.unc.edu/grb/grb120711a.png
GCN Circular #13434
D. Gotz (CEA-Saclay), S. Mereghetti (IASF Milano), E. Bozzo, C. Ferrigno, L. Gibaud (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a long and bright GRB has been detected by IBAS in the IBIS/ISGRI data at 02:44:48 UT on July 11th 2012. The GRB lasts approximately 135 s and its refined coordinates are
```
RA: 94.703 [degrees]
DEC: -71.001 [degrees]
```
with an uncertainty of 1.1 arc min (90% c.l.).
A preliminary spectral analysis yields a fluence of 1.6e-5 erg/cmsq in the 20-200 keV energy band and a peak flux over 1 s of 10 photons/cmsq/s in the same energy band. Please note that due to telemetry saturation at satellite levels there values are only lower limits. We note that our position is consistent with the optical transient reported by Lacluyze et al. (CGN 13430). A plot of the light curve has been posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Jul 12 09:28:00 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     526283,   Seg_Num: 0
GRB_RA:          270.2852d {+18h 01m 08.4s} (J2000),
                 270.4783d {+18h 01m 54.7s} (current),
                 269.5144d {+17h 58m 03.4s} (1950)
GRB_DEC:         -25.0783d {-25d 04' 41.8"} (J2000),
                 -25.0778d {-25d 04' 40.2"} (current),
                 -25.0778d {-25d 04' 40.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       254 [cnts]
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34030.87 SOD {09:27:10.87} UT,   488.3 [sec] since BAT Trigger Time
CENTROID_X:      289.25,  raw= 289  [pixels]
CENTROID_Y:      263.31,  raw= 263  [pixels]
ROLL:            265.13 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -81.77
GRB_POS_XRT_Z:   -34.05
IMAGE_URL:       sw00526283000msxps_rw.img
SUN_POSTN:       111.08d {+07h 24m 19s}  +22.02d {+22d 01' 23"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.08d {+01h 20m 19s}  +12.18d {+12d 10' 34"}
MOON_DIST:       112.73 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.08, -1.02 [deg] galactic lon,lat of the burst
ECL_COORDS:      270.26, -1.64 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Jul 12 09:28:10 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     526283,   Seg_Num: 0
GRB_RA:          270.2852d {+18h 01m 08.4s} (J2000),
                 270.4783d {+18h 01m 54.7s} (current),
                 269.5144d {+17h 58m 03.4s} (1950)
GRB_DEC:         -25.0783d {-25d 04' 41.8"} (J2000),
                 -25.0778d {-25d 04' 40.2"} (current),
                 -25.0778d {-25d 04' 40.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       254 [cnts]
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34030.87 SOD {09:27:10.87} UT,   488.3 [sec] since BAT Trigger Time
CENTROID_X:      289.25,  raw= 289  [pixels]
CENTROID_Y:      263.31,  raw= 263  [pixels]
ROLL:            265.13 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -81.77
GRB_POS_XRT_Z:   -34.05
IMAGE_URL:       sw00526283000msxps_rw.img
SUN_POSTN:       111.08d {+07h 24m 19s}  +22.02d {+22d 01' 23"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.08d {+01h 20m 20s}  +12.18d {+12d 10' 36"}
MOON_DIST:       112.73 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.08, -1.02 [deg] galactic lon,lat of the burst
ECL_COORDS:      270.26, -1.64 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Jul 12 09:31:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.298d {+18h 01m 11s} (J2000)
POINT_DEC:       -25.100d {-25d 05' 58"} (J2000)
POINT_ROLL:      265.136d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34038.18 SOD {09:27:18.18} UT,   495.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.017
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00526283000msufc0495.fits
SUN_POSTN:       111.08d {+07h 24m 20s}  +22.02d {+22d 01' 22"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.11d {+01h 20m 26s}  +12.19d {+12d 11' 06"}
MOON_DIST:       112.75 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Jul 12 09:31:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.298d {+18h 01m 11s} (J2000)
POINT_DEC:       -25.100d {-25d 05' 58"} (J2000)
POINT_ROLL:      265.136d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34038.18 SOD {09:27:18.18} UT,   495.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.017
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00526283000msufc0495.fits
SUN_POSTN:       111.08d {+07h 24m 20s}  +22.02d {+22d 01' 21"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.11d {+01h 20m 27s}  +12.19d {+12d 11' 11"}
MOON_DIST:       112.76 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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:     Wed 11 Jul 12 09:33:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.298d {+18h 01m 11s} (J2000)
POINT_DEC:       -25.100d {-25d 05' 58"} (J2000)
ROLL:            265.136d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34038.18 SOD {09:27:18.18} UT,   495.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363691647
X_OFFSET:        943 [pixels]
Y_OFFSET:        986 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1103
Y_GRB_POS:       1146
BINNING_INDEX:   1
IM_URL:          sw00526283000msuni0505.fits
SUN_POSTN:       111.08d {+07h 24m 20s}  +22.02d {+22d 01' 21"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.12d {+01h 20m 29s}  +12.19d {+12d 11' 22"}
MOON_DIST:       112.77 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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:     Wed 11 Jul 12 09:33:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.298d {+18h 01m 11s} (J2000)
POINT_DEC:       -25.100d {-25d 05' 58"} (J2000)
ROLL:            265.136d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34038.18 SOD {09:27:18.18} UT,   495.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363691647
X_OFFSET:        943 [pixels]
Y_OFFSET:        986 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1103
Y_GRB_POS:       1146
BINNING_INDEX:   1
IM_URL:          sw00526283000msuni0505.fits
SUN_POSTN:       111.08d {+07h 24m 20s}  +22.02d {+22d 01' 21"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.13d {+01h 20m 30s}  +12.19d {+12d 11' 25"}
MOON_DIST:       112.77 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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:     Wed 11 Jul 12 09:35:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.299d {+18h 01m 12s} (J2000)
POINT_DEC:       -25.101d {-25d 06' 01"} (J2000)
POINT_ROLL:      265.135d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34420.59 SOD {09:33:40.59} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.448
N_STARS:         190
X_OFFSET:        383 [pixels]
Y_OFFSET:        426 [pixels]
X_MAX:           1822 [pixels]
Y_MAX:           1865 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00526283000msufc0878.fits
SUN_POSTN:       111.09d {+07h 24m 21s}  +22.02d {+22d 01' 20"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.15d {+01h 20m 35s}  +12.20d {+12d 11' 48"}
MOON_DIST:       112.79 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Jul 12 09:36:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.299d {+18h 01m 12s} (J2000)
POINT_DEC:       -25.101d {-25d 06' 01"} (J2000)
POINT_ROLL:      265.135d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34420.59 SOD {09:33:40.59} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.448
N_STARS:         190
X_OFFSET:        383 [pixels]
Y_OFFSET:        426 [pixels]
X_MAX:           1822 [pixels]
Y_MAX:           1865 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00526283000msufc0878.fits
SUN_POSTN:       111.09d {+07h 24m 21s}  +22.02d {+22d 01' 20"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.15d {+01h 20m 36s}  +12.20d {+12d 11' 52"}
MOON_DIST:       112.79 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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:     Wed 11 Jul 12 09:37:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.299d {+18h 01m 12s} (J2000)
POINT_DEC:       -25.101d {-25d 06' 01"} (J2000)
ROLL:            265.135d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34420.59 SOD {09:33:40.59} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363692030
X_OFFSET:        942 [pixels]
Y_OFFSET:        985 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1102
Y_GRB_POS:       1145
BINNING_INDEX:   1
IM_URL:          sw00526283000msuni0888.fits
SUN_POSTN:       111.09d {+07h 24m 21s}  +22.02d {+22d 01' 20"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.16d {+01h 20m 38s}  +12.20d {+12d 12' 02"}
MOON_DIST:       112.80 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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:     Wed 11 Jul 12 09:37:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     526283,   Seg_Num: 0
POINT_RA:        270.299d {+18h 01m 12s} (J2000)
POINT_DEC:       -25.101d {-25d 06' 01"} (J2000)
ROLL:            265.135d
IMG_START_DATE:  16119 TJD;   193 DOY;   12/07/11
IMG_START_TIME:  34420.59 SOD {09:33:40.59} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363692030
X_OFFSET:        942 [pixels]
Y_OFFSET:        985 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1102
Y_GRB_POS:       1145
BINNING_INDEX:   1
IM_URL:          sw00526283000msuni0888.fits
SUN_POSTN:       111.09d {+07h 24m 21s}  +22.02d {+22d 01' 19"}
SUN_DIST:        160.89 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       20.16d {+01h 20m 38s}  +12.20d {+12d 12' 05"}
MOON_DIST:       112.80 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:        5.07, -1.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.27, -1.66 [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 #13435
E. Bozzo (ISDC, Versoix), D. Gotz (CEA-Saclay), S. Mereghetti (IASF Milano), C. Ferrigno, L. Gibaud (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
A refined analysis of a larger IBIS/ISGRI dataset corresponding to the GRB120711A (GCN 13432), revealed a faint emission, lasting for at least ~1000s, after the main outburst. Being this duration unusual for a GRB, we are at present unable to rule out a different nature for this event (e.g. a bright transient in the direction of the LMC).
The event has been detected also using the SPI Anti Coincidence System (ACS) on board of INTEGRAL which is not saturated and shows a highly structured light-curve at the peak http://www.isdc.unige.ch/~bozzo/lightcurve.dat .
Further observations are encouraged.
GCN Circular #13436
M. Serino (RIKEN), M. Morii(Tokyo Tech), S. Nakahira (JAXA), N. Kawai, R. Usui, K. Ishikawa, T. Yoshii (Tokyo Tech), S. Ueno, H. Tomida, M. Ishikawa (JAXA), T. Mihara, M. Sugizaki, T. Yamamoto, J. Sugimoto, M. Matsuoka (RIKEN), A. Yoshida (AGU), H. Tsunemi, M. Kimura (Osaka U.), H. Negoro, M. Nakajima, M. Asada, H. Sakakibara, N. Serita (Nihon U.), Y. Ueda, K. Hiroi, M. Shidatsu, R. Sato (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.) M. Yamauchi, Y. Nishimura, T. Hanayama, K. Yoshidome (Miyazaki U.), K. Yamaoka (Waseda U.) report on behalf of the MAXI team:
MAXI/GSC triggered at 2012-07-11T02:45:12 UT on a bright uncatalogued X-ray transient source. The transient emission lasted at least 50 seconds within the 67 second long triangular transit response of MAXI/GSC.
Assuming that the source flux was constant over the transit, we obtain the source position at
(R.A., Dec) = (94.04 deg, -71.09 deg) = (06 16 10,$B!!(B-71 05 37)(J2000)
with a 90% C.L. statistical error of 12 arcmin and an additional systematic uncertainty of 0.1 deg (90% containment radius).
Without assuming the source constancy, we obtain a rectangular error box (90%C.L.) with the following corners:
```
(R.A., Dec) = (+94.86 deg, -70.99 deg) = (06 19 29, -70 59 26)(J2000)
(R.A., Dec) = (+94.93 deg, -71.21 deg) = (06 19 44, -71 12 23)(J2000)
(R.A., Dec) = (+91.53 deg, -71.22 deg) = (06 06 06, -71 13 27)(J2000)
(R.A., Dec) = (+91.52 deg, -71.01 deg) = (06 06 05, -71 00 26)(J2000)
```
This error region includes the position of GRB 120711A reported by Lacluyze et al. (GCN #13430) and Gotz et al. (GCN #13434).
Fixing the source position to that of GRB 120711A, we obtained the light curve corrected with the transit response within the GSC scan. It was variable within the scan, and the peak flux was 610 +- 130 (mCrab, 2-20 keV) on 2012-07-11 02:44:54 UT.
GCN Circular #13437
David Gruber (MPE) and V=E9ronique Pelassa (UAH) report on behalf of the Fermi GBM Team:
"At 02:44:53.29 UT on 11 July 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120711A (trigger 363667496 / 120711115). which was also detected by the INTEGRAL/IBAS (Gotz et al. 2012, GCN 13434). The GBM on-ground location is consistent with the INTEGRAL position.
The angle from the Fermi LAT boresight is 140 degrees. Moreover, this burst was bright enough to result in a Fermi spacecraft autonomous rapid repoint (ARR) maneuver.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of a precursor which is followed by a hard, main emission after ~ 50 s, lasting for another ~ 50 s. The T90 is about 44 s (50-300 keV). The time-averaged spectrum from T0-1 s to T0+131 s is best fit by a Band function with Epeak =3D 973 +/- 35 keV, alpha =3D -0.94 +/- 0.01, and beta =3D -2.40 +/- 0.04. This spectrum is typical of a bright, hard GRB, and would be=20 highly unusual for an X-ray transient (Bozzo et al. 2012, GCN 13435).
The event fluence (10-1000 keV) in this time interval is (1.942 +/- 0.002)E-04 erg/cm^2. The 1-sec peak photon flux measured starting from T0+95 s in the 10-1000 keV band is 26.7 +/- 0.6 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #13438
J. Elliott (MPE Garching), S. Klose (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 120711A (INTEGRAL trigger 6599: Gotz et al., GCN 13434; Bozzo et al., GCN 13435; MAXI/GSC detection: Serino et al., GCN 13436; Fermi/GBM trigger 363667496 / 120711115: Gruber & Pelassa, GCN 13427) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started on July 11, 08:34 UT, 5.8 hrs after the trigger as soon the location became visible at La Silla. The afterglow (Lacluyze et al., GCN 13430, 13433; Zheng, GCN 13432) is clearly detected in all bands.
For an exposure of 8 min in JHK and 7.66 min in g'r'i'z', at an average airmass of 2.5 and an average seeing of 2".0, we measure the following preliminary AB magnitudes
```
    g' = 20.9  +/- 0.1
    r' = 20.2  +/- 0.1
    i' = 19.6  +/- 0.1
    z' = 19.4  +/- 0.1
    J  = 18.6  +/- 0.1
    H  = 18.2  +/- 0.1
    K  = 18.0  +/- 0.1
```
The SED, after correction for Galactic reddening along the line of sight (E(B-V)=0.09 mag; Schlegel et al. 1998), can be described by a power law (beta ~ 1.4) with a reduced flux in the g-band, suggesting a photometric redshift of about 3. We note that also the PROMPT afterglow light curve (http://skynet.unc.edu/grb/grb120711a.png) supports a drop-out in the blue bands.
Magnitudes are derived based on GROND zeropoints (g'r'i'z') and 2MASS stars (JHK).
GCN Circular #13439
D. Fugazza, S. Covino, A. Rossi on behalf of the REM team report:
We imaged the field of GRB120711A (Gotz et al., GCN 13434 and Bozzo et al., GCN 13435) with the NIR camera (the optical camera is at present under maintenance) of the REM 60cm telescope located at La Silla.
The bright optical counterpart reported in GCN 13430 (Lacluyze et al.), GCN 13432 (Zheng et al.) and GCN 13438 (Elliot et al.) is well detected in the NIR at a peak magnitude of H = 11.90 + 0.05 between 2-4 minutes after the burst. The source was then fading rapidly remaining approximately at the same magnitude, H~13, for several more minutes.
Data have been calibrated by isolated not-saturated 2MASS stars in the field.
GCN Circular #13441
N. R. Tanvir, K. Wiersema (U. Leicester), A. J. Levan (U. Warwick), D. Fox (Penn State), A. Fruchter (STScI) and D. Krogsrud (Gemini) report on behalf of a larger collaboration:
We observed the afterglow of GRB 120711A (Gotz et al. GCN 12434; Lacluyze et al. GCN 12430) using the GMOS-S spectrograph on Gemini-South.
Observations began at 2012-7-11 10:08 UT, about 7.5 hr post-burst. The data were obtained at high air-mass and on the boundary of twilight, so the signal-to-noise is rather poor. Nevertheless, in the spectrum we identify lines of MgII (2797/2804A) and FeII (2374/2383/2587/2600A) at a common redshift of z=1.405.
This therefore provides a robust lower-limit to the redshift of the GRB. Furthermore, given the lack of other absorption features, in particular any matching a redshift z~3 (Elliott et al. GCN 13438), we tentatively identify z=1.405 as the most likely GRB redshift.
GCN Circular #13442
A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
We have analysed 657 s of XRT data for the INTEGRAL-detected burst: GRB 120711A (Gotz et al. GCN Circ. 13434), from 8.3 ks to 20.0 ks after the INTEGRAL trigger. The data comprise 269 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. An X-ray source is detected within the INTEGRAL error circle. Using 336 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 94.67830, -70.99905 which is equivalent to:
```
RA (J2000): 06h 18m 42.79s
Dec(J2000): -70d 59' 56.6"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position is 29 arcsec from the INTEGRAL position and 0.3 arcsec from the Skynet/PROMPT position (LaCluyze et al. GCN Circ. 13430).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.59 (+0.16, -0.15).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.15 (+/-0.11). The best-fitting absorption column is 3.6 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 7.9 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.80 (+0.25, -0.23) and a best-fitting absorption column of 2.4 (+0.9, -0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (6.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.4 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 7.9 x 10^20 cm^-2
Excess significance: 3.2 sigma
Photon index:	     1.80 (+0.25, -0.23)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020223.
This circular is an official product of the Swift-XRT team.
GCN Circular #13443
H. Levato and C. Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
C. Mallamaci, C. Lopez and F. Podest Observatorio Astronomico Felix Aguilar (OAFA)
D. Denisenko, A. Kuznetsov, V. Lipunov, E. Gorbovskoy, V. Kornilov, D. Kuvshinov, A. Belinski, N. Tyurina, N. Shatskiy, P. Balanutsa, D. Zimnukhov, V.V. Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V. Sennik Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, S. Yazev, N.M. Budnev, O. Gres, O. Chuvalaev, V.A. Poleshchuk Irkutsk State University
V. Yurkov, Yu. Sergienko, D. Varda, E. Sinyakov Blagoveschensk Educational State University, Blagoveschensk
V. Krushinski, I. Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University
MASTER-ICATE robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) located in Argentina (Observatorio Astronomico Felix Aguilar, http://93.180.27.230:8080/) were pointed to the INTEGRAL TRIGGER_NUM 6599 = Fermi TRIGGER_NUM: 363667496 60 sec after INTEGRAL trigger Time (Gotz et al., GCN 13434, Gruber and Pelassa, GCN 13437) on 2012-07-11 at 02:45:54.107 UT.
Our cameras are continuously imaging the sky with 5 sec exposures.
On our first unfiltered image (5 sec exposure) we have not found any OT. We see OT (Lacluyze et al., GCN 13430, Zheng et al., GCN 13432, Elliot et al., GCN 13438, Fugazza et al., GCN 13439 and Tanvir et al., GCN 13441) on the sum of 4 images obtained between T0+121s and T0+141s with the unfiltered magnitude 12.5. Nothing is visible at the OT position on the individual (m_lim = 12.0) and combined (m_lim=13.0) images obtained before T0+121s and after T0+141s.
This message can be cited.
GCN Circular #13444
P.H.T. Tam, K.L. Li and A.K.H. Kong (NTHU) report:
We report on the Fermi Large Area Telescope (LAT) detection of >100 MeV gamma-ray emission from the direction of the bright GRB 120711A, which triggered INTEGRAL (Gotz et al., GCN 13434), MAXI/GSC (Serino et al., GCN 13436), and Fermi/GBM (Gruber et al., GCN 13437). The GRB position was outside the LAT field of view at the GRB onset (c.f. GCN 13437). However, gamma-ray emission up to around 2 GeV was detected from the GRB direction from 0.8 ks to ~7 ks after the burst. Such duration is one of the longest ever observed for a GRB in GeV domain.
Using the data obtained from the above period, an unbinned likelihood analysis resulted in a detection significance of ~7 sigma, and a photon spectral index of -1.8+-0.3. We localized the LAT emission to be at RA, DEC (J2000 deg) = 94.58, -70.93, with a statistical error of ~0.17 deg (68% CL), which is compatible with the Swift/XRT position (Beardmore et al., GCN 13442).
GCN Circular #13445
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 long hard intense GRB 120711A (detected by the INTEGRAL/IBAS Gotz et al., GCN 13434; MAXI/GSC detection: Serino et al., GCN 13436; Fermi/GBM trigger 363667496/120711115: Gruber & Palassa, GCN 13437; Fermi/LAT detection: Tam, Li & Kong, GCN 13444) triggered Konus-Wind at T0=3D09955.810s UT (02:45:55.810)
The light curve starts with a precursor at ~T0-65s followed by a strong hard double pulse lasting from ~T0-3 s to ~T0+50 s. Several short (100 - 200 ms) bright spikes are well detected over the general burst light curve in the ~T0+30 s to ~T0+40 s time interval. A a weak decaying emission tail in the soft energy channel G1(25-90 keV) is detectable till at least ~T0+400s. The emission during the main phase of the event is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120711_T09955/
As observed by Konus-Wind the burst had a fluence of 3.8(-0.2,+0.2)x10-4 erg/cm2, and a 64-ms peak flux, measured from T0+32.576 s, of 3.6(-0.4,+0.4)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+46.336 s) is best fit in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.97 (-0.02, +0.02), the high energy photon index beta =3D -2.7 (-0.3, +0.2), the peak energy Ep =3D 1060(-60, +60) keV, chi2 =3D 95.7/87 dof.
The spectrum at the maximum count rate (measured from T0+30.208 to T0+34.560 s) is best fit in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.93 (-0.04, +0.04), the high energy photon index beta =3D -2.5 (-0.5, +0.3), the peak energy Ep =3D 1400(-160, +170) keV, chi2 =3D 85.5/87 dof.
Assuming the likely GRB redshift of z=3D1.405 (Tanvir et al., GCN 13441) 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 (1.95 =B1 0.1)x10^54 erg, the isotropic peak luminosity L_iso_max is (4.5 =B1 0.5)x10^53 erg/s, and Ep_rest is (2550 =B1 150) keV.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #13446
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 long hard intense GRB 120711A (detected by the INTEGRAL/IBAS Gotz et al., GCN 13434; MAXI/GSC detection: Serino et al., GCN 13436; Fermi/GBM trigger 363667496/120711115: Gruber & Palassa, GCN 13437; Fermi/LAT detection: Tam, Li & Kong, GCN 13444) triggered Konus-Wind at T0=3D09955.810s UT (02:45:55.810)
The light curve starts with a precursor at ~T0-65s followed by a strong hard double pulse lasting from ~T0-3 s to ~T0+50 s. Several short (100 - 200 ms) bright spikes are well detected over the general burst light curve in the ~T0+30 s to ~T0+40 s time interval. A a weak decaying emission tail in the soft energy channel G1(25-90 keV) is detectable till at least ~T0+400s. The emission during the main phase of the event is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120711_T09955/
As observed by Konus-Wind the burst had a fluence of 3.8(-0.2,+0.2)x10-4 erg/cm2, and a 64-ms peak flux, measured from T0+32.576 s, of 3.6(-0.4,+0.4)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+46.336 s) is best fit in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.97 (-0.02, +0.02), the high energy photon index beta =3D -2.7 (-0.3, +0.2), the peak energy Ep =3D 1060(-60, +60) keV, chi2 = 95.7/87 dof.
The spectrum at the maximum count rate (measured from T0+30.208 to T0+34.560 s) is best fit in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.93 (-0.04, +0.04), the high energy photon index beta =3D -2.5 (-0.5, +0.3), the peak energy Ep =3D 1400(-160, +170) keV, chi2 =3D 85.5/87 dof.
Assuming the likely GRB redshift of z=1.405 (Tanvir et al., GCN 13441) and a standard cosmology model with H_0 =3D 71 km/s/Mpc, Omega_M =0.27, Omega_Lambda = 0.73: the isotropic energy release E_iso is (1.95 = 0.1)x10^54 erg, the isotropic peak luminosity L_iso_max is (4.5 = 0.5)x10^53 erg/s, and Ep_rest is (2550 = 150) keV.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #13448
A. A. Breeveld (MSSL-UCL) and M. J. Page (MSSL-UCL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120711A 8216 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 13434). No significant optical afterglow consistent with the position given in Lacluyze et al. (GCN_Circ. 13430) is detected in the initial UVOT exposures. However, in the U filter, the source may be detected at this position with a significance of 2 sigma. The possible detection is included in the table. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

b                 8464         8480           16         >18.7
u                 8380         8459           79         >19.4
w1                8216         8375          157         >19.8

u                 8380         8459           79        19.6 =B1 0.5 (2sig)
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.08 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #13451
P. Hancock, T. Murphy, B. Gaensler, M. Bell, D. Burlon (University of Sydney/CAASTRO), A. de Ugarte Postigo (Dark Cosmology / IAA)
We observed GRB120711A (GCN 13434) with the Australia Telescope Compact Array at 34GHz for 26 minutes centered on 21:37UT Jul 11 2012 (T0+18.9hours) in stormy weather.
We detect no radio source at the location of the GRB (GCN 13430) and place an upper limit of 3.6mJy on the flux of an afterglow.
Further observations are planned.
These observations were obtained as part of ATCA project C2689. We thank the observatory staff for their support and scheduling the observations. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
GCN Circular #13452
Daniel Kocevski (Stanford Univ.) and Giacomo Vianello (CIFS/SLAC), Nicola Omodei (Stanford Univ.), and Seth Digel (SLAC) report on behalf of the Fermi LAT Team:
Fermi-LAT has detected high energy emission from the bright GRB 120711A in ground analysis. The GRB triggered the Fermi-GBM on July 11th, 2012 at 02:44:53.29 UTC (trigger 363667496/120711115, Gruber et al. GCN 13437) and was bright enough to result in a spacecraft autonomous repoint.
At the time of the GBM trigger, the angle between the GRB position and the LAT bore-sight was 134.4 degrees for the duration of the prompt emission, and remained outside the Fermi-LAT nominal field of view for an additional ~600 seconds.
A preliminary maximum-likelihood analysis of the E>75MeV P7TRANSIENT_V6 LAT data centered on the XRT position reported by Beardmore et al. (GCN 13442) generated for the interval T0+600s to T0+1100s revealed a significant transient source, with a spectrum well described by a power law of index -2.0 +/ 0.3 (68% C.L. statistical only). These results are in agreement with those found by Tam et al. (GCN 13444). Using the data covering T0+600s to T0+1100s, we obtained the best LAT on-ground localization of:
```
RA(J2000) = 94.7 deg
Dec(J2000) = -70.9 deg
```
with an error radius of 0.16 deg (90% containment, statistical error only), which is 0.09 deg from the XRT position, and 0.07 deg from the position reported by Tam et al. (GCN 13444).
We note that this position is ~1.4 degrees away from the known variable gamma-ray source 2FGL J0601.1-7037, which has been associated with the blazar PKS 0601-70. In order to understand if the observed excess can be due to a brightening of the blazar we considered two nested models for our data, one including just the blazar, and one including both the blazar and a new source (the GRB). Our data favor the latter model, with the fit converging to a solution with a negligible contribution from the blazar, as expected from the mean flux reported in the Fermi 2FGL catalog (Nolan et al., 2012). An analysis using E>75MeV P7TRANSIENT_V6 data covering an interval before the burst (T0-6000s to T0-2000 s) shows no significant emission at the location of the blazar. Thus, 2FGL J0601.1-7037 is unlikely to be the source of the excess.
We caution against the use of data after ~T0+2600 s, because of a large Zenith angle of the GRB, potentially resulting in a strong contamination from terrestrial gamma-rays originating from charged particle interactions with Earth's atmosphere.
The Fermi-LAT point of contact for this burst is Daniel Kocevski (kocevski@stanford.edu)
GCN Circular #13463
P. Hancock, T. Murphy, B. Gaensler, M. Bell, D. Burlon (University of Sydney/CAASTRO), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI)
We observed GRB120711A (GCN 13434) with the Australia Telescope Compact Array at 34GHz for 60 minutes centered on 23:18UT Jul 13 2012 (T0+2.85days).
We detect no radio source at the location of the GRB (GCN 13430) and place a 3sigma upper limit of 230uJy on the flux of an afterglow.
Further observations are planned.
These observations were obtained as part of ATCA project C2689. We thank the observatory staff for their support and scheduling the observations. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
GCN Circular #13468
L. Hanlon (UCD), A. Martin-Carrillo (UCD), X.-L. Zhang (MPE) and A. von Kienlin (MPE) report:
"The bright and long GRB detected by IBAS in the INTEGRAL IBIS/ISGRI data at 02:44:48 UT on July 11th 2012 (Gotz et al., GCN 13434 ) was also observed by the Spectrometer SPI onboard INTEGRAL, in addition to the detection by its anticoincidence shield (SPI-ACS). The event was located in the field of view of SPI, which allows spectral analysis of this event.
The light curve from SPI events starts with a precursor at 02:44:50 UT followed by a bright double peaked main emission phase at 02:45:55 UT with a duration of about 50 sec. The emission during the main peak is seen up to ~3 MeV. We searched for the faint and soft emission after the main outburst reported by E. Bozzo et al. (GCN 13435) and S. Golenetskii et al. (GCN 13446). We find a weak tail in the 20 to 100 keV energy range, lasting for about 800 s after the main emission phase .
The time-integrated spectrum of the main emission phase is well fitted (in the 20 keV - 3 MeV range) by an exponential cutoff powerlaw model, with photon index = 1.00+/-0.03 and an high energy cutoff at 1200 +/- 200 keV. The fluence during the 50 seconds main emission phase in the 20-1000 keV range is (2.26 +/- 0.04)E-4 erg/cm^2.
The spectral analysis results presented above are preliminary."
GCN Circular #13485
P. Hancock, T. Murphy, B. Gaensler, M. Bell, D. Burlon (University of Sydney/CAASTRO), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI)
We observed GRB120711A (GCN 13434) with the Australia Telescope Compact Array at 34GHz for 64 minutes centered on 21:42UT Jul 16 2012 (T0+3.78days) in clear weather.
We detect no radio source at the location of the GRB (GCN 13430) and place a 3sigma upper limit of 96uJy on the flux of an afterglow.
No further observations are planned.
These observations were obtained as part of ATCA project C2689. We thank the observatory staff for their support and scheduling the observations. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
GCN Circular #13513
XMM-Newton will observe GRB120711A at location (RA=06h 18m 42.79s, DEC=-70d 59' 56.6", J2000), starting at 20:01:44 UT, on July 28, 2012, for an exposure of 28000 seconds.
XMM-Newton SOC
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1307.8345 from 1 Aug 13
Andrea Giuliani et al.: A search for lines in the bright X-ray afterglow of GRB120711A
GRB 120711A, discovered and rapidly localized by the INTEGRAL satellite, attracted particular interest due to its high gamma-ray fluence, very bright X-ray afterglow, and the detection of a prompt optical transient and of long-lasting emission at GeV energies. A follow-up observation carried out with the XMM-Newton satellite has provided an X-ray spectrum in the 0.3-10 keV with unprecedented statistics for a GRB afterglow 20 hours after the burst. The spectrum is well fit by a power-law with photon index 1.87+-0.01, modified by absorption in our Galaxy and in the GRB host at z=1.4. A Galactic absorption consistent with that estimated from neutral hydrogen observations is obtained only with host metallicity lower than 0.05 of the Solar value. We report the results of a sensitive search for emission and absorption lines using the matched filter smoothing method (Rutledge and Sako 2003). No statistically significant lines were found. The upper limits on the equivalent width of emission lines, derived through Monte Carlo simulations, are few tens of eV, a factor about 10 lower than that of the possible lines reported in the literature for other bursts.
1405.7396 from 30 May 14
A. Martin-Carrillo et al.: GRB 120711A: an intense INTEGRAL burst with long-lasting soft gamma-ray emission and a powerful optical flash
A long and intense gamma-ray burst (GRB) was detected by INTEGRAL on July 11 2012 with a duration of ~115s and fluence of 2.8x10^-4 erg cm^-2 in the 20 keV-8 MeV energy range. GRB 120711A was at z~1.405 and produced soft gamma-ray emission (>20 keV) for at least ~10 ks after the trigger. The GRB was observed by several ground-based telescopes that detected a powerful optical flash peaking at an R-band brightness of ~11.5 mag at ~126 s after the trigger. We present a comprehensive temporal and spectral analysis of the long-lasting soft gamma-ray emission detected in the 20-200 keV band with INTEGRAL, the Fermi/LAT post-GRB detection above 100 MeV, the soft X-ray afterglow from XMM-Newton, Chandra, and Swift and the optical/NIR detections from Watcher, Skynet, GROND, and REM. We modelled the long-lasting soft gamma-ray emission using the standard afterglow scenario, which indicates a forward shock origin. The combination of data extending from the NIR to GeV energies suggest that the emission is produced by a broken power-law spectrum consistent with synchrotron radiation. The afterglow is well modelled using a stratified wind-like environment with a density profile k~1.2, suggesting a massive star progenitor (i.e. Wolf-Rayet). The analysis of the reverse and forward shock emission reveals an initial Lorentz factor of ~120-340, a jet half-opening angle of ~2deg-5deg, and a baryon load of ~10^-5-10^-6 Msun consistent with the expectations of the fireball model when the emission is highly relativistic. Long-lasting soft gamma-ray emission from other INTEGRAL GRBs with high peak fluxes, such as GRB 041219A, was not detected, suggesting that a combination of high Lorentz factor, emission above 100 MeV, and possibly a powerful reverse shock are required. Similar long-lasting soft gamma-ray emission has recently been observed from the nearby and extremely bright Fermi/LAT burst GRB 130427A.
1504.06369 from 27 Apr 15
Romain Hasco�t et al.: Measuring Ambient Densities and Lorentz Factors of Gamma-Ray Bursts from GeV and Optical Observations
Fermi satellite discovered that cosmological gamma-ray bursts (GRBs) are accompanied by long GeV flashes. In two GRBs, an optical counterpart of the GeV flash has been detected. Recent work suggests that the GeV+optical flash is emitted by the external blast wave from the explosion in a medium loaded with copious $e^\pm$ pairs. The full light curve of the flash is predicted by a first-principle radiative transfer simulation and can be tested against observations. Here we examine a sample of 7 bursts with best GeV+optical data and test the model. We find that the observed light curves are in agreement with the theoretical predictions and allow us to measure three parameters for each burst: the Lorentz factor of the explosion, its isotropic kinetic energy, and the external density. With one possible exception of GRB 090510 (which is the only short burst in the sample) the ambient medium is consistent with a wind from a Wolf-Rayet progenitor. The wind density parameter $A=\rho r^2$ varies in the sample around $10^{11}$g/cm. The initial Lorentz factor of the blast wave varies from 200 to 540 and correlates with the burst luminosity. Radiative efficiency of the prompt emission in the sample is between 0.1 and 0.8. For the two bursts with detected optical flash, GRB 120711A and GRB 130427A, we also estimate the magnetization of the external blast wave. Remarkably, the model reproduces the entire optical light curve of GRB 120711A (with its sharp peak, fast decay, plateau, and break) as well as the GeV data. The spectrum of GeV flashes is predicted to extend above 0.1 TeV, where they can be detected by ground-based Cherenkov telescopes.

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