Gamma-ray Burst 110709B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:33:03 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     456967,   Seg_Num: 0
GRB_RA:          164.614d {+10h 58m 27s} (J2000),
                 164.755d {+10h 59m 01s} (current),
                 164.006d {+10h 56m 02s} (1950)
GRB_DEC:         -23.484d {-23d 29' 01"} (J2000),
                 -23.546d {-23d 32' 44"} (current),
                 -23.216d {-23d 12' 56"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4045 [cnts]    Image_Peak=175 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       25593 [cnts]
BKG_TIME:        77544.85 SOD {21:32:24.85} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15751 TJD;   190 DOY;   11/07/09
GRB_TIME:        77559.83 SOD {21:32:39.83} UT
GRB_PHI:         147.27 [deg]
GRB_THETA:        28.65 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.48 [sigma]
IMAGE_SIGNIF:    7.39 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 -32  +0 
SUN_POSTN:       108.78d {+07h 15m 07s}  +22.31d {+22d 18' 53"}
SUN_DIST:         71.16 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.23d {+14h 20m 54s}  -17.92d {-17d 55' 13"}
MOON_DIST:        47.31 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.96, 32.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.81,-27.54 [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 = 227.50,16.23 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:34:30 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     456967,   Seg_Num: 0
GRB_RA:          164.6552d {+10h 58m 37.24s} (J2000),
                 164.7955d {+10h 59m 10.90s} (current),
                 164.0471d {+10h 56m 11.29s} (1950)
GRB_DEC:         -23.4550d {-23d 27' 17.9"} (J2000),
                 -23.5169d {-23d 31' 00.7"} (current),
                 -23.1869d {-23d 11' 12.8"} (1950)
GRB_ERROR:       5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.37e-09 [erg/cm2/sec]
GRB_SIGNIF:      6.70 [sigma]
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77640.36 SOD {21:34:00.36} UT,   80.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.23 261.55 243.36
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       108.78d {+07h 15m 07s}  +22.31d {+22d 18' 52"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.24d {+14h 20m 58s}  -17.92d {-17d 55' 26"}
MOON_DIST:        47.28 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      175.84,-27.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.83 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:34:41 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     456967,   Seg_Num: 0
GRB_RA:          164.6552d {+10h 58m 37.2s} (J2000),
                 164.7955d {+10h 59m 10.9s} (current),
                 164.0471d {+10h 56m 11.2s} (1950)
GRB_DEC:         -23.4550d {-23d 27' 17.9"} (J2000),
                 -23.5169d {-23d 31' 00.7"} (current),
                 -23.1869d {-23d 11' 12.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       45 [cnts]
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77640.36 SOD {21:34:00.36} UT,   80.5 [sec] since BAT Trigger Time
CENTROID_X:      294.02,  raw= 294  [pixels]
CENTROID_Y:      219.47,  raw= 219  [pixels]
ROLL:            305.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -185.10
GRB_POS_XRT_Z:   -19.50
IMAGE_URL:       sw00456967000msxps_rw.img
SUN_POSTN:       108.78d {+07h 15m 08s}  +22.31d {+22d 18' 52"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.24d {+14h 20m 58s}  -17.92d {-17d 55' 28"}
MOON_DIST:        47.28 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      175.84,-27.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:34:48 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     456967,   Seg_Num: 0
GRB_RA:          164.6552d {+10h 58m 37.2s} (J2000),
                 164.7955d {+10h 59m 10.9s} (current),
                 164.0471d {+10h 56m 11.2s} (1950)
GRB_DEC:         -23.4550d {-23d 27' 17.9"} (J2000),
                 -23.5169d {-23d 31' 00.7"} (current),
                 -23.1869d {-23d 11' 12.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       45 [cnts]
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77640.36 SOD {21:34:00.36} UT,   80.5 [sec] since BAT Trigger Time
CENTROID_X:      294.02,  raw= 294  [pixels]
CENTROID_Y:      219.47,  raw= 219  [pixels]
ROLL:            305.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -185.10
GRB_POS_XRT_Z:   -19.50
IMAGE_URL:       sw00456967000msxps_rw.img
SUN_POSTN:       108.78d {+07h 15m 08s}  +22.31d {+22d 18' 52"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.24d {+14h 20m 58s}  -17.93d {-17d 55' 29"}
MOON_DIST:        47.28 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      175.84,-27.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:36:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     456967,   Seg_Num: 0
GRB_RA:          164.614d {+10h 58m 27s} (J2000),
                 164.755d {+10h 59m 01s} (current),
                 164.006d {+10h 56m 02s} (1950)
GRB_DEC:         -23.484d {-23d 29' 01"} (J2000),
                 -23.546d {-23d 32' 44"} (current),
                 -23.216d {-23d 12' 56"} (1950)
GRB_DATE:        15751 TJD;   190 DOY;   11/07/09
GRB_TIME:        77559.83 SOD {21:32:39.83} UT
TRIGGER_INDEX:   146
GRB_PHI:         147.27 [deg]
GRB_THETA:        28.65 [deg]
DELTA_TIME:      -56.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.48 [sigma]
IMAGE_SIGNIF:    7.39 [sigma]
LC_URL:          sw00456967000msb.lc
SUN_POSTN:       108.78d {+07h 15m 08s}  +22.31d {+22d 18' 52"}
SUN_DIST:         71.16 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.26d {+14h 21m 02s}  -17.93d {-17d 55' 45"}
MOON_DIST:        47.33 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.96, 32.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.81,-27.54 [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 = 227.50,16.23 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:37:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 30s} (J2000)
POINT_DEC:       -23.500d {-23d 29' 58"} (J2000)
POINT_ROLL:      305.930d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77650.93 SOD {21:34:10.93} UT,   91.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.789
N_STARS:         35
X_OFFSET:        681 [pixels]
Y_OFFSET:        859 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00456967000msufc0091.fits
SUN_POSTN:       108.78d {+07h 15m 08s}  +22.31d {+22d 18' 51"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.27d {+14h 21m 06s}  -17.93d {-17d 55' 57"}
MOON_DIST:        47.33 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:38:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 30s} (J2000)
POINT_DEC:       -23.500d {-23d 29' 58"} (J2000)
POINT_ROLL:      305.930d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77650.93 SOD {21:34:10.93} UT,   91.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.789
N_STARS:         35
X_OFFSET:        681 [pixels]
Y_OFFSET:        859 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00456967000msufc0091.fits
SUN_POSTN:       108.78d {+07h 15m 08s}  +22.31d {+22d 18' 51"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.28d {+14h 21m 06s}  -17.93d {-17d 56' 00"}
MOON_DIST:        47.34 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:40:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 30s} (J2000)
POINT_DEC:       -23.500d {-23d 29' 58"} (J2000)
ROLL:            305.930d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77650.93 SOD {21:34:10.93} UT,   91.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     331940058
X_OFFSET:        1001 [pixels]
Y_OFFSET:        1179 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       1339
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0099.fits
SUN_POSTN:       108.79d {+07h 15m 08s}  +22.31d {+22d 18' 51"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.30d {+14h 21m 12s}  -17.94d {-17d 56' 21"}
MOON_DIST:        47.36 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:40:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 30s} (J2000)
POINT_DEC:       -23.500d {-23d 29' 58"} (J2000)
ROLL:            305.930d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77650.93 SOD {21:34:10.93} UT,   91.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     331940058
X_OFFSET:        1001 [pixels]
Y_OFFSET:        1179 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       1339
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0099.fits
SUN_POSTN:       108.79d {+07h 15m 09s}  +22.31d {+22d 18' 50"}
SUN_DIST:         71.18 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.30d {+14h 21m 12s}  -17.94d {-17d 56' 23"}
MOON_DIST:        47.36 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:45:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.499d {-23d 29' 54"} (J2000)
POINT_ROLL:      305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77862.86 SOD {21:37:42.86} UT,   303.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.268
N_STARS:         26
X_OFFSET:        681 [pixels]
Y_OFFSET:        859 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00456967000msufc0303.fits
SUN_POSTN:       108.79d {+07h 15m 09s}  +22.31d {+22d 18' 49"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.35d {+14h 21m 24s}  -17.95d {-17d 57' 10"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:46:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.499d {-23d 29' 54"} (J2000)
POINT_ROLL:      305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77862.86 SOD {21:37:42.86} UT,   303.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.268
N_STARS:         26
X_OFFSET:        681 [pixels]
Y_OFFSET:        859 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00456967000msufc0303.fits
SUN_POSTN:       108.79d {+07h 15m 09s}  +22.31d {+22d 18' 49"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.36d {+14h 21m 25s}  -17.95d {-17d 57' 13"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:46:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.499d {-23d 29' 54"} (J2000)
ROLL:            305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77862.86 SOD {21:37:42.86} UT,   303.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     331940270
X_OFFSET:        1001 [pixels]
Y_OFFSET:        1179 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       1339
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0311.fits
SUN_POSTN:       108.79d {+07h 15m 10s}  +22.31d {+22d 18' 49"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.36d {+14h 21m 27s}  -17.96d {-17d 57' 21"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:47:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.499d {-23d 29' 54"} (J2000)
ROLL:            305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  77862.86 SOD {21:37:42.86} UT,   303.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     331940270
X_OFFSET:        1001 [pixels]
Y_OFFSET:        1179 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       1339
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0311.fits
SUN_POSTN:       108.79d {+07h 15m 10s}  +22.31d {+22d 18' 48"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.37d {+14h 21m 28s}  -17.96d {-17d 57' 23"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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 #12122
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), D. M. Palmer (LANL), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 21:32:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110709B (trigger=456967). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 164.614, -23.484 which is
```
   RA(J2000)  =  10h 58m 27s
   Dec(J2000) = -23d 29' 01"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows overlapping peaks with a total duration of about 60 sec. The peak count rate was ~4200 counts/sec (15-350 keV), at ~30 sec after the trigger.
The XRT began observing the field at 21:34:00.4 UT, 80.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 164.6552, -23.4550 which is equivalent to:
```
   RA(J2000)  = 10h 58m 37.24s
   Dec(J2000) = -23d 27' 17.9"
```
with an uncertainty of 5.3 arcseconds (radius, 90% containment). This location is 171 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 91 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:47:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     456969,   Seg_Num: 0 
GRB_RA:          164.647d {+10h 58m 35s} (J2000),
                 164.787d {+10h 59m 09s} (current),
                 164.039d {+10h 56m 09s} (1950)  
GRB_DEC:         -23.464d {-23d 27' 49"} (J2000),
                 -23.526d {-23d 31' 32"} (current),
                 -23.196d {-23d 11' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]  
GRB_INTEN:       12747 [cnts]    Image_Peak=1015 [image_cnts]
TRIGGER_DUR:     2.048 [sec]   
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       93947 [cnts]  
BKG_TIME:        78168.85 SOD {21:42:48.85} UT
BKG_DUR:         24 [sec]
GRB_DATE:        15751 TJD;   190 DOY;   11/07/09
GRB_TIME:        78205.40 SOD {21:43:25.40} UT
GRB_PHI:         -11.77 [deg]
GRB_THETA:         0.02 [deg]
SOLN_STATUS:     0xD
RATE_SIGNIF:     39.26 [sigma]
IMAGE_SIGNIF:    18.78 [sigma] 
MERIT_PARAMS:     +0  +0 +100  +1  +2  +6  +0  +0 -32  +0
SUN_POSTN:       108.79d {+07h 15m 10s}  +22.31d {+22d 18' 48"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.37d {+14h 21m 29s}  -17.96d {-17d 57' 27"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      68 [%]   
GAL_COORDS:      271.98, 32.54 [deg] galactic lon,lat of the burst (or transient)      
ECL_COORDS:      175.83,-27.51 [deg] ecliptic lon,lat of the burst (or transient)      
COMMENTS:        SWIFT-BAT GRB Coordinates.
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;
COMMENTS:        probably due to it occurring during a Malindi downlink session.
COMMENTS:        This is a rate trigger.
COMMENTS:        A point_source was found.  
COMMENTS:        This matches a source in the on-board catalog: Num=26967=(null) (probably an AT_Slot).
COMMENTS:        This does not match any source in the ground catalog.
COMMENTS:        This is not a GRB.
COMMENTS:        This trigger occurred at longitude,latitude = 267.26,20.57 [deg].

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:47:47 UT
NOTICE_TYPE:     Swift-BAT Transient Position
TRIGGER_NUM:     456969,   Seg_Num: 0 
GRB_RA:          164.647d {+10h 58m 35s} (J2000),
                 164.787d {+10h 59m 09s} (current),
                 164.039d {+10h 56m 09s} (1950)  
GRB_DEC:         -23.464d {-23d 27' 49"} (J2000),
                 -23.526d {-23d 31' 32"} (current),
                 -23.196d {-23d 11' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]  
GRB_INTEN:       12747 [cnts]    Image_Peak=1015 [image_cnts]
TRIGGER_DUR:     2.048 [sec]   
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       93947 [cnts]  
BKG_TIME:        78168.85 SOD {21:42:48.85} UT
BKG_DUR:         24 [sec]
GRB_DATE:        15751 TJD;   190 DOY;   11/07/09
GRB_TIME:        78205.40 SOD {21:43:25.40} UT
GRB_PHI:         -11.77 [deg]
GRB_THETA:         0.02 [deg]
SOLN_STATUS:     0xD
RATE_SIGNIF:     39.26 [sigma]
IMAGE_SIGNIF:    18.78 [sigma]
MERIT_PARAMS:     +0  +0 +100  +1  +2  +6  +0  +0 -32  +0
SUN_POSTN:       108.79d {+07h 15m 10s}  +22.31d {+22d 18' 48"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.37d {+14h 21m 29s}  -17.96d {-17d 57' 28"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      68 [%]   
GAL_COORDS:      271.98, 32.54 [deg] galactic lon,lat of the burst (or transient)      
ECL_COORDS:      175.83,-27.51 [deg] ecliptic lon,lat of the burst (or transient)      
COMMENTS:        SWIFT-BAT Transient Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;
COMMENTS:        probably due to it occurring during a Malindi downlink session.
COMMENTS:        This is a rate trigger.
COMMENTS:        A point_source was found.  
COMMENTS:        This matches a source in the on-board catalog: Num=26967=(null) (probably an AT_Slot).
COMMENTS:        This does not match any source in the ground catalog.
COMMENTS:        This is not a GRB -- it is a hard x-ray transient.
COMMENTS:        This trigger occurred at longitude,latitude = 267.26,20.57 [deg].

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:49:06 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     456969,   Seg_Num: 0
GRB_RA:          164.647d {+10h 58m 35s} (J2000),
                 164.787d {+10h 59m 09s} (current),
                 164.039d {+10h 56m 09s} (1950)
GRB_DEC:         -23.464d {-23d 27' 49"} (J2000),
                 -23.526d {-23d 31' 32"} (current), 
                 -23.196d {-23d 11' 44"} (1950) 
GRB_DATE:        15751 TJD;   190 DOY;   11/07/09 
GRB_TIME:        78205.40 SOD {21:43:25.40} UT
TRIGGER_INDEX:   262
GRB_PHI:         -11.77 [deg]  
GRB_THETA:         0.02 [deg]  
DELTA_TIME:      25.00 [sec]
TRIGGER_DUR:     2.048 [sec]
SOLN_STATUS:     0xD
RATE_SIGNIF:     39.26 [sigma] 
IMAGE_SIGNIF:    18.78 [sigma]
LC_URL:          sw00456969000msb.lc
SUN_POSTN:       108.79d {+07h 15m 10s}  +22.31d {+22d 18' 48"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.39d {+14h 21m 32s}  -17.96d {-17d 57' 41"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.83,-27.51 [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 matches a source in the on-board catalog.
COMMENTS:        This does not match any source in the ground catalog.
COMMENTS:        This is not a GRB.
COMMENTS:        This trigger occurred at longitude,latitude = 267.26,20.57 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:53:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.498d {-23d 29' 53"} (J2000)
POINT_ROLL:      305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  78417.85 SOD {21:46:57.85} UT,   212.5 [sec] since BAT Trigger  Time
FILTER:          10, White
BKG_MEAN:        3.408
N_STARS:         91
X_OFFSET:        441 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1880 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00456967000msufc0212.fits
SUN_POSTN:       108.79d {+07h 15m 11s}  +22.31d {+22d 18' 47"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.43d {+14h 21m 42s}  -17.97d {-17d 58' 18"}
MOON_DIST:        47.46 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 Jul 11 21:53:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.498d {-23d 29' 53"} (J2000)
POINT_ROLL:      305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  78417.85 SOD {21:46:57.85} UT,   212.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.408
N_STARS:         91
X_OFFSET:        441 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1880 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00456967000msufc0212.fits
SUN_POSTN:       108.79d {+07h 15m 11s}  +22.31d {+22d 18' 47"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.43d {+14h 21m 43s}  -17.97d {-17d 58' 21"}
MOON_DIST:        47.46 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:54:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.498d {-23d 29' 53"} (J2000)
ROLL:            305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  78417.85 SOD {21:46:57.85} UT,   212.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     331940824
X_OFFSET:        1000 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1160
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0220.fits
SUN_POSTN:       108.80d {+07h 15m 11s}  +22.31d {+22d 18' 46"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.44d {+14h 21m 46s}  -17.98d {-17d 58' 34"}
MOON_DIST:        47.48 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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:     Sat 09 Jul 11 21:55:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     456967,   Seg_Num: 0
POINT_RA:        164.627d {+10h 58m 31s} (J2000)
POINT_DEC:       -23.498d {-23d 29' 53"} (J2000)
ROLL:            305.928d
IMG_START_DATE:  15751 TJD;   190 DOY;   11/07/09
IMG_START_TIME:  78417.85 SOD {21:46:57.85} UT,   212.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     331940824
X_OFFSET:        1000 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1160
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00456967000msuni0220.fits
SUN_POSTN:       108.80d {+07h 15m 11s}  +22.31d {+22d 18' 46"}
SUN_DIST:         71.17 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      215.45d {+14h 21m 47s}  -17.98d {-17d 58' 37"}
MOON_DIST:        47.48 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      271.98, 32.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.83,-27.55 [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 #12124
S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), D. M. Palmer (LANL), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 21:43:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located a second event (trigger=456969) from the same location as trigger 456967. Swift did not slew to this location. However, it was already on the boresight of all 3 instruments from the previous trigger. The BAT on-board calculated location is RA, Dec 164.647, -23.464, which is
```
   RA(J2000) = 10h 58m 35s
   Dec(J2000) = -23d 27' 49"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a broad hump begining around T-100, followed by an episode of several overlapping peaks structure with a duration of about 40 s, and another peak at T+200s, for a total duration of this outburst of at least 300 s. The peak count rate was ~5000 counts/sec (15-350 keV), at ~1 sec after the trigger.
This is a second outburst from the same location as GRB 110709B at T+11 minutes, with comparable intensity and light curve characteristics to the initial outburst.
The light curve is sharp with rapid variations on the 1-second timescale, which is uncharacteristic of late time flares in GRB afterglows. There is no obvious bright activity seen in the BAT lightcurve between the two outbursts.
The location is well away from the Galactic plane, and its spectrum is much harder than typical Galactic transients.
This is a highly unusual event, and follow-up observations should be a high priority.
GCN Circular #12126
A.J. Levan (University of Warwick) reports:
"Inspection of DSS-II images of the region around GRB 110709B (Cummings et al. GCN 12122) shows a faint optical source at a location of
```
RA(J2000) 10:58:37.34
DEC(J2000) -23:27:21.6
```
offset 3.9" from the centre of the XRT error circle (which currently has a 5.3", 90% confidence error).
The source is apparently also detected in USNO-A2.0, with reported magnitudes of B=21.2, R=17.9 (although at this faint level the associated errors are large). This source may be a quiescent counterpart of GRB 110709B, although could also be an unrelated background (or foreground) source. The probability of chance alignment with a source with R~18 in this error region is ~1-2% (e.g. Bloom, Kulkarni, Djorgovski 2002, AJ 123, 1111)"
GCN Circular #12128
E. Berger (Harvard) reports on behalf of a larger collaboration:
"We observed the field of the unusual GRB 110709B (GCNs 12122, 12124) with GMOS on the Gemini-South 8-m telescope starting on 2011 July 10.032 UT (3.2 hr after the initial trigger). Images were obtained at high airmass and in poor seeing (1.7"). In a stack of 5x180 sec r-band exposures we find a single faint source within the XRT error circle (GCN 12122) at (J2000):
```
RA = 10:58:37.38
DEC = -23:27:21.21
```
With an uncertainty of about 0.3" in each coordinate. This source is consistent with the position of the DSS-II source reported by Levan (GCN 12126). Additional analysis is in progress."
GCN Circular #12129
Adria C. Updike (NASA/GSFC), Felipe Olivares E., Jochen Greiner (both MPE Garching), and D. Alexander Kann (Tautenburg Obs.) report on behalf of the GROND team:
We observed the field of the extremely long GRB 110709B (Swift trigger 456967; Cummings et al., GCN #12122, Barthelmy et al., GCN #12124) 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 22:34 UT on the 9th of July 2011, 62 minutes after the GRB trigger, and are continuing. They were performed at an average seeing of 1.5" and at an average airmass of 1.3.
We found two point sources within the 5".3 Swift/XRT error circle reported by Cummings et al. (GCN #12122). The first one is consistent with the source in the DSS which was reported by Levan (GCN # 12126) and confirmed by Berger (GCN #12128) and we furthermore detect a second, fainter source at
```
RA (J2000.0) = 10h 58m 37.03s
DEC (J2000.0) = -23d 27' 20.8"
```
with an uncertainty of 0.5" in each coordinate.
Based on 460 s of total exposures with mid-time 94 min after the trigger, we estimate preliminary r'-band magnitudes of 20.9 +/- 0.1 for the DSS source and 22.15 +/- 0.15 for the second source, both calibrated against GROND zero points (in AB system). The given magnitudes are not corrected for the Galactic foreground extinction corresponding to a reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
At the moment, we cannot confirm if this second source is fading, but we suggest it as an afterglow candidate for GRB 110709B.
GCN Circular #12130
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
We report further analysis of BAT GRB 110709B (triggers #456967 and #456969; Cummings, et al., GCN Circ. 12122 and Barthelmy, et al., GCN Circ. 12124).
Because of the interesting nature of this event, we are posting preliminary versions of the "refined" processing on the two triggers of GRB 110709B. The automated analysis of each trigger is provided separately. We will likely post the final refined analysis later when all of the full data is downlinked, and the combined analysis can be performed.
At present, the first of the two BAT triggers (trigger #456967) consists of data from T-61 to T+234 sec. The second trigger (trigger #456969) consists of only a small amount of data from T-11 to T+63 sec. The two triggers are 645 sec apart.
The BAT ground-calculated position of the first trigger (#456967) is, RA, Dec = 164.668, -23.470 deg, which is
```
   RA(J2000)  =  10h 58m 40.3s 
   Dec(J2000) = -23d 28' 11.4" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The position derived from the second trigger (#456969) is RA, Dec = 164.664, -23.500 deg, which is
```
   RA(J2000)  =  10h 58m 39.4s 
   Dec(J2000) = -23d 29' 59.6" 
```
with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100% (on the BAT bore sight as a result of the slew from the first trigger). The two positions are separated by 1.8 arcmin.
The mask-weighted light curve of the first trigger, trigger #456967, shows the first peak of the cluster of peaks starting at ~T-30 sec (note that the partial downlinked data start only at T-61 sec), peaks at ~T+15 sec, and ends at T+130 or T+170 sec. T90 (15-350 keV) is 55.6 +- 3.2 sec (estimated error including systematics).
The time-averaged spectrum of the data for the first trigger, trigger #456967, from T-27.4 to T+46.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.29 +- 0.04. The fluence in the 15-150 keV band is 9.4 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+13.59 sec in the 15-150 keV band is 3.4 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The mask-weighted light curve of the second trigger, #456969, shows emission starting some time before the current data set starting at T=21:43:25.4 - 11 sec and extending beyond the T=21:43:25.4 + 63 sec of the partially downlinked data.
The time-averaged spectrum of the second trigger, #456969, from T-8.2 to T+52.8 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.08 +- 0.17, and Epeak of 171.5 +- 81.8 keV (chi squared 36.6 for 56 d.o.f.). A fit to a simple power law gives a photon index of 1.39 +- 0.04 (chi squared 47.2 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at Trigger 456967: http://gcn.gsfc.nasa.gov/notices_s/456967/BA/ Trigger 456969: http://gcn.gsfc.nasa.gov/notices_s/456969/BA/
GCN Circular #12131
L. P. Xin and J.Y Wei reports:
We noted that A. J. Levan reports (GCN 12126) that a source was detected in USNO-A2.0, with a magnitude of B=21.2, R=17.9.
Its coordinates are:
```
RA(J2000): 10:58:37.34
DEC(J2000): -23:27:21.6
Epoch:(J2000)
```
We check the USNO-B1.0 catalog and find that this source above reported by Levan (GCN 12126) disappeared in USNO-B1.0 catalog. However, another source was detected in USNO-B1.0 at the errorbox of X-ray counterparts.
Its coordinates are
```
RA(J2000) 10:58:37.00
DEC(J2000) -23:27:19.94
Epoch:(J2000)
```
Its magnitudes are reported as R=19.69, B=21.08.
The coordinates are consistent with the report of Updike et al. (GCN 12129).
Further observations are encouraged, especially the redshift measurement, to check out weather this source is the counterpart of GRB 110709B or just a foreground or background source.
GCN Circular #12132
E. Berger (Harvard) reports on behalf of a larger collaboration:
"Additional inspection and photometry of our Gemini-South r-band image (GCN 12128) reveals a second, fainter source (S2) at the following coordinates (J2000):
```
RA = 10:58:36.955
DEC = -23:27:20.62
```
with an uncertainty of about 0.8" (due to centroid uncertainty). This position is consistent with the faint source detected by GROND (GCN 12129).
Photometry of the two sources using the Gemini-South/GMOS standard photometric zero-point yields the following magnitudes:
```
S1:  r = 21.28+/-0.05 mag ("DSS" source)
S2:  r = 22.18+/-0.12 mag
```
Taken at face value, the brightness of S2 is consistent with the GROND value (r=22.15+/-0.15 mag; GCN 12129), suggesting that S1 has actually faded by about 0.3+/-0.15 mag between 1 and 3.2 hours after the initial trigger.
Alternatively, if the offset relative to the GROND photometry of S1 (r=20.9+/-0.1 mag) is due to a zero-point offset, the resulting brightness of S2 is r = 21.9+/-0.1 mag. This is marginally consistent with the GROND value (r=22.15+/-0.15 mag) which was obtained about 2.2 hours earlier than our observations.
To determine which scenario is correct relative to the GROND photometry, we measure the brightness of the star at:
```
RA = 10:58:38.053
DEC = -23:26:31.78
```
to be r = 18.25 mag."
GCN Circular #12135
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 GRB 110709B (Swift-BAT trigger #456967: Cummings et al., GCN 12122; Barthelmy et al., GCN 12130) triggered Konus-Wind at T0=3D77564.576s UT (21:32:44.576)
The burst light curve shows a multi-peaked pulse with a total duration of ~70 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB110709_T77564/
As observed by Konus-Wind the burst had a fluence of (2.6 =B1 0.2)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+13.824 s, of (1.1 =B1 0.1)x10-5 erg/cm2/s (both in the 20 keV - 5 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+41.216 s) is best fitted in the 20 keV - 5 MeV range by a power law with exponential cutoff model, for which
```
alpha =3D -1.0 (-0.13, +0.14),
and Ep =3D 278(-32, +43) keV,
chi2 =3D 62.7/73 dof.
```
The spectrum at the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fitted in the 20 keV - 5 MeV range by a power law with exponential cutoff model, for which
```
alpha = -0.56 (-0.26, +0.30),
and Ep = 231(-28, +38) keV,
chi2 = 65.9/73 dof.
```
The renewed source activity (Swift-BAT trigger #456969: Barthelmy et al., GCN 12124) fell into the telemetry gap but was recorded by the instrument's spare count rate measurement channel. This low-resolution record (in the 70-300 keV energy range) shows a double-pulsed structure lasting for ~100 s from T0+573 s to T0+675 s (21:42:17 - 21:43:59) and having slightly weaker intensity as compared to the initial burst.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #12136
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 9216 s of XRT Photon Counting mode data and 18 UVOT images for GRB 110709B, 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 = 164.65448, -23.45489 which is equivalent to:
```
RA (J2000): 10h 58m 37.08s
Dec (J2000): -23d 27' 17.6"
```
with an uncertainty of 1.4 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 #12137
D. Frederiks on behalf of the Konus-Wind team:
The correct value of GRB 110709B peak energy flux measured by Konus-Wind is (1.1 =B1 0.1)x10-6 erg/cm2/s, this is an order of magnitude lower than it is reported in GCN 12135.
We apologize for this misprint.
GCN Circular #12140
S. T. Holland (CRESST/USRA/GSFC) and J. R. Cummings (GSFC/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110709B 91 s after the initial BAT trigger (Cummings et al., GCNC 12122). We detect a source at the location of the GROND source reported by Updike et al. (GCNC 12129). The preliminary UVOT position is:
```
     RA (J2000)  10:58:37.03  =  164.65429 (deg)
    Dec (J2000) -23:27:20.9   =  -23.45581 (deg)
```
with an estimated uncertainty of 0.49 arcsec (radius, 90% confidence, statistical + systematic). Preliminary photometry indicates that this source may have flared at approximately the time of the second BAT trigger (Barthelmy et al., GCNC 12124). Preliminary magnitudes and 3-sigma upper limits, using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the white exposures are:
```
Filter    T_start(s) T_stop(s)  Exp(s)   Mag   Err
white (fc)     91       241     147   >21.1   3-sigma upper limit
white         583       603      19    20.10  0.49 
white         756       776      19    19.74  0.37
white         858      1008     147    20.94  0.34
white (fc)   6245      6444     197    21.19  0.38
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 mag in the direction of the burst (Schlegel et al. 1998). Further analysis of the Swift/UVOT data is ongoing.
GCN Circular #12142
V. D'Elia, G. Stratta and J. R. Cummings (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed 16 ks of XRT data for GRB 110709B (Cummings et al. GCN Circ. 12122), from 70 s to 36.8 ks after the BAT trigger. The data comprise 2.3 ks in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12136).
The light curve shows a prolonged and powerful flaring activity up to T0+2 ks. The late-time light curve (from T0+5.4 ks) can be modelled with a power-law decay with a decay index of alpha=1.08 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.550 (+/-0.020). The best-fitting absorption column is 1.79 (+/-0.07) x 10^21 cm^-2, in excess of the Galactic value of 5.6 x 10^20 cm^-2 (Kalberla et al. 2005). We stress that this fit averages over strong spectral variations. In fact, the hard-to-soft band ratio during this time period varies from about 0.5 to about 3. The PC mode spectrum has a photon index of 2.19 (+/-0.08) and a best-fitting absorption column of 2.14 (+0.22, -0.21) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (6.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.14 (+0.22, -0.21) x 10^21 cm^-2
Galactic foreground: 5.6 x 10^20 cm^-2
Excess significance: 16.8 sigma
Photon index:	     2.19 (+/-0.08)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00456967.
This circular is an official product of the Swift-XRT team.
GCN Circular #12143
A. Copete, J. Grindlay (Harvard) S. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC)
We report the detection of the early emission from GRB 110709B (GCNs 12122, 12124) by the BAT Slew Survey (BATSS) in the slew that started at 21:32:53 UT and lasted 55 sec, immediately following the original on-board detection. The ground-calculated position is RA, Dec = 164.654, -23.464 deg, which is RA (J2000) = 10h 58m 37.0s Dec (J2000) = -23d 27' 51" with an uncertainty of 1.8 arcmin (90% confidence radius, incl. systematics). The trigger was issued as a result of simultaneous independent detections of 44.0 and 31.3 sigma from imaging in the 15-50 keV and 50-150 keV energy bands, respectively. The burst mask-tagged lightcurve in the 15-150 keV band shows a fading profile with several overlapping peaks within it, from the start of the the slew at T+14s until fading into the background at T+48s during the course of the slew.
The time-averaged spectrum over the 34 sec duration of the burst within the slew is best fit by a power law with an exponential cutoff, with photon index 1.06 +- 0.18, and Epeak of 175.7 (+151.3/-44.5) keV. The fluence in the 15-150 keV band is 4.9 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux (from T+17.0s, 15-150 keV) is 3.35 +- 0.25 photons/cm2/sec. All errors are quoted at 90% confidence level.
The analysis software for the BAT Slew Survey has undergone a thorough revision, and its burst-finding function to process downlinked slew data and issue automated real-time alerts is now fully operational. At the current rate of ~80 ksec of instrument exposure time downlinked per month (about 30% of all slew data), it is expected to to detect ~0.5 new bursts per month, separate from those already detected in pointing mode. BATSS alert notices are distributed through the GCN: http://gcn.gsfc.nasa.gov/gcn/swift.html#tc2x2
GCN Circular #12144
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU/NASA/GSFC), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+1608 sec, we report further analysis of BAT GRB 110709B (triggers #456967 and #456969) (Cummings, et al., GCN Circ. 12122, Barthelmy, et al., GCN Circ. 12124, and Barthelmy, et al., GCN Circ. 12130), where T is the time of the first trigger.
The BAT ground-calculated position for the second event (trigger #456969) is RA, Dec = 164.655, -23.456 deg which is
```
      RA(J2000)  =  10h 58m 37.3s
      Dec(J2000) = -23d 27' 20.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. This position is 1.0 arcmin from the ground- calculated position of the first event (trigger #456967), which had an estimated uncertainty of 1.1 arcmin. The position of 456969 is 0.07 arcmin from the enhanced XRT position (Beardmore et al., GCN Circ 12136). The two events are clearly from the same object.
The main emission in the first event lasted from about T-28 sec to T+55 sec with a faint declining emission detectable to about T+180 sec. T90 (15-350 keV) of the first event was 55.6 +- 3.2 sec. There was no flux detectable in BAT from about T+180 to about T+485 sec. The second event lasted from T+485 sec to T+865 sec with a variety of peaks and spikes on top of an ongoing emission. T90 (15-350 keV) of the second event was 259.2 +- 8.8 sec (estimated error including systematics). Considering the two events as a whole, T90 was about 846 +- 6 seconds. The lightcurve of the second event was clearly different from the first, so the unusual separation of two episodes of bright emission was not the result of gravitational lensing.
The separation of episodes is unusual but not unprecedented. For instance, GRBs 041219A, 060124, 070721B, and 050820A also had multiple episodes separated by long intervals with no detectable emission.
The source came into the BAT FOV at ~T-75 (during a slew that started at T-200sec and settled at ~T-20 sec.). The source was above the Earth horizon for about 20 minutes prior to trigger 456967. We cannot rule out faint or soft emission prior to about T-75 sec, but for 20 minutes prior to the first trigger, there was no strong emission above about 50 keV.
The time-averaged spectrum of the data for the first trigger, trigger #456967, from T-27.4 to T+46.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.29 +- 0.04. The fluence in the 15-150 keV band is 9.4 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+13.59 sec in the 15-150 keV band is 3.4 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The time-averaged spectrum from T+518.5 to T+855.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.44 +- 0.04. The fluence in the 15-150 keV band is 1.44 +- 0.04 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+1.06 sec in the 15-150 keV band is 3.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Examination of archival pre-trigger data from when the location of GRB 110709B was in the BAT field of view reveals no significant precursor emission. In the two observations closest in time to the trigger, upper limits are set at 0.005 ct/s/cm2 (T-6903 to T-6345 sec) and 0.004 ct/s/cm2 (T-12526 to T-11986 sec) and T-6903 to T-6345 sec). There is also no emission detected in daily averages going back to 2011 June 1, with an average upper limit of 0.002 ct/s/cm2 (~8 mCrab). All errors are 1-sigma for the 15-50 keV energy band.
In the 70-month averaged BAT Hard X-ray Survey, the three-sigma upper limit at the position of the XRT counterpart for GRB 110709B is 6.4e-12 ergs/cm2/sec in the 14-195 keV band.
The results of the batgrbproduct analysis are available at Trigger 456967: http://gcn.gsfc.nasa.gov/notices_s/456967/BA/ Trigger 456969: http://gcn.gsfc.nasa.gov/notices_s/456969/BA/ http://gcn.gsfc.nasa.gov/notices_s/comb_456967_456969/BA/top.html
GCN Circular #12151
A. de Ugarte Postigo (DARK/NBI), A. Lundgren, C. De Breuck, G. Siringo, R. Parra and C. Agurto (ESO) report on behalf of a larger collaboration:
We have observed the field of GRB 110709B (Cummings et al. GCN 12122) using LABOCA/APEX at Chajnantor (Chile) in the 870 micrometer band. Observations began on July 11 2011 at 21:31 UT (2.00 days after the burst), with an on source time of 106 min and PWV of 0.8mm. We used the photometric mode, centred at the refined XRT position (Beardmore et al. GCN 12136).
Initial data reduction, using CRUSH and BoA does no not detect any significant emission, obtaining a formal flux on the source position of 1.4+/-2.3mJy (3-sigma limit of 6.9mJy).
We acknowledge the effort done by the APEX staff to get the telescope back into operations after a 3m snow fall at Chajnantor.
GCN Circular #12155
W. Fong and E. Berger (Harvard) report:
"We re-observed the location of GRB 110709B (GCNs 12122, 12124) with GMOS on the Gemini-South 8-m telescope starting on 2011 July 13.958 UT (4.1 days after the initial trigger). Images were obtained in mediocre seeing (1.35"). In a stack of 5x180 sec r-band exposures we still detect sources S1 and S2 (GCNs 12126, 12128, 12129, 12132). Neither source exhibits evidence for fading in photometry relative to several nearby stars, and in digital image subtraction using the ISIS package. We further note that both S1 and S2 are located outside of the refined XRT error circle (GCN 12136).
We do not detect any other sources within the refined XRT circle in either of our Gemini epochs to a limit of >23.8 mag at delta-t=3.2 hours and >25.1 mag at 4.1 days. A comparison to the X-ray flux density at 3.2 hours (F_nu,X ~ 12 microJy**) requires a spectral index of beta_OX > 0.4 for F_nu ~ nu^beta. This is a highly unusual spectral index since typical values are beta_OX ~ -0.6 to -1, and events with beta_OX > -0.5 are considered "dark bursts". Such an unusual spectral index may be indicative of a high redshift origin (z>4.5 based on r-band non-detection) or a non-GRB origin similar to the recent GRB 110328A."

GCN Circular #12157
S. T. Holland (CRESST/USRA/GSFC) and J. R. Cummings (CRESST/UMBC/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 110709B starting 70 s after the BAT trigger (Cummings et al., 2011, GCNC 12122). Settled observations started at 91 s. We do not detect a source at the UVOT-enhanced XRT position (Beardmore, et al., 2011, GCNC 12136) in any of the UVOT filters. Preliminary 3-sigma upper limits for detecting a source in the finding charts and in the co-added images, are

Filter       TSTART       TSTOP  EXPOSURE       Mag
---------------------------------------------------
white (FC) &     91 &       241 &     147 &   >21.1
    u (FC) &    303 &       553 &     246 &   >20.5
white (FC) &    858 &      1008 &     147 &   >21.3
---------------------------------------------------
    v     &     633 &    64,817 &    3519 &   >21.5
    b     &     558 &    54,124 &    3664 &   >22.4
    u     &     303 &    59,906 &    4680 &   >22.2
 uvw1     &     682 &    59,264 &    4730 &   >22.2
 uvm2     &    1235 &    58,357 &    3732 &   >22.3
 uvw2     &     782 &    64,122 &    3530 &   >22.4
white     &      91 &    30,997 &    3107 &   >23.0
---------------------------------------------------

We find weak evidence for variability at the location of the USNO-B1.0 source 3.5 arcsec WNW of the XRT position at the time of the second BAT trigger (Barthelmy et al. 2011, GCNC 12124). Preliminary photometry is

Filter       TSTART       TSTOP  EXPOSURE       Mag   Err  Sigma
----------------------------------------------------------------
white &          91 &       241 &     147 &   >21.1   3-sigma UL
white &         583 &       776 &      39 &    20.08 0.35    3.3
white &         858 &      1008 &     147 &   >21.3   3-sigma UL
white &        1161 &      2047 &     117 &    20.96 0.36    3.1
white &        6245 &      6444 &     197 &   >21.4   3-sigma UL
white &        7679 &    11,397 &     340 &    21.07 0.37    3.1
white &       11401 &    12,005 &     590 &   >21.9   3-sigma UL
white &       17893 &    18,800 &     885 &    20.98 0.16    7.8
white &       30335 &    30,997 &     644 &    21.39 0.23    5.2
----------------------------------------------------------------

We note that both the USNO-B1.0 source and the XRT position are located in the coincidence loss halo of a bright star, which makes precision photometry difficult. It is not clear if the apparent variability seen at the location of the USNO-B1.0 source is real or not.
The quoted magnitudes and upper limits have not been corrected for the large, but uncertain, Galactic extinction along the line of sight to this burst (E_{B-V} = 0.05 mag, Schlegel et al. 1998, ApJS, 500, 525).

GCN Circular #12172
N. Ohmori, M. Akiyama, M. Yamauchi (Univ. of Miyazaki), M. Ohno, Y. Hanabata, T. Uehara, T. Takahashi, M. Mizuno, Y. Fukazawa (Hiroshima U.), K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U.), T. Yasuda, Y. Terada, M. Tashiro, W. Iwakiri, K. Takahara (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 GRB110709B (Swift/BAT trigger #456967, GCN 12122 ; Cummings et al.,) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 21:32:44.453 UT (=T0).
The observed light curve shows multiple peaks starting at T0-10 s, ending at T0+40 s, with a duration (T90) of about 48 seconds. The fluence in 100 - 1000 keV was 1.53 (-0.16, +0.29) x 10^-5 erg/cm^2. The 1-s peak flux measured from T0+25.5 s was 1.70 (-0.43, +0.30) photons/cm^2/s in the same range.
Preliminary result shows that the time-averaged spectrum from T0-12 s to T0+40 s is well fitted by a power-law with exponential cutoff model:
```
 dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
 alpha       0.61 (-1.16, +0.95), and
 Epeak       286 (-80, +41) keV (chi^2/d.o.f. = 12.6/14).
```
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #12190
A. Zauderer and E. Berger (Harvard/CfA) report on behalf of a larger collaboration:
"We observed GRB 110709B (GCN 12122) with the EVLA on several occasions between 2011 July 11 and 16 UT at a frequency of 5.8 GHz. Within the XRT error circle (GCN 12136) we find a single unresolved radio source which brightened by about a factor of 1.6 between 2.1 and 7.0 days after the burst. The source is located at (J2000):
```
RA =   10:58:37.114
Dec = -23:27:16.760
```
The coincidence with the XRT position and the rising flux indicate that this source is the radio afterglow of GRB 110709B. No optical counterpart is detected at this position in our Gemini r-band observations (GCNs 12132, 12155) to a limit of >23.8 mag at 3.2 hours and >25.1 mag at 4.1 days. Along with the bright X-ray counterpart, the radio source provides additional support that GRB 110709B is a dark burst.
We thank the EVLA staff for their support of these observations."
1111.2922 from 15 Nov 11
Bin-Bin Zhang et al.: Unusual Central Engine Activity in the Double Burst GRB 110709B
The double burst, GRB 110709B, triggered Swift/BAT twice at 21:32:39 UT and 21:43:45 UT, respectively, on 9 July 2011. This is the first time we observed a GRB with two BAT triggers. In this paper, we present simultaneous Swift and Konus-WIND observations of this unusual GRB and its afterglow. If the two events are from the same physical origin, their different time-dependent spectral evolution suggest they must belong to different episodes of the central engine, which may be a magnetar-to-BH accretion system.
1301.6014 from 28 Jan 13
Ana Virginia Penacchioni et al.: GRB 110709B in the Induced Gravitational Collapse paradigm
Context: GRB110709B is the first source for which Swift BAT triggered twice, with a time separation of ~10 min. The first emission (Ep. 1) goes from 40s before the 1{\deg} trigger up to 60s after it. The second (Ep. 2) goes from 35s before the 2{\deg} trigger to 100s after it.[...] Within the Induced Gravitational Collapse (IGC) model, we assume the progenitor to be a close binary system composed of a core of an evolved star and a Neutron Star (NS). The evolved star explodes as a Supernova (SN) and ejects material that is partially accreted by the NS. We identify this process with Ep. 1. The accretion process brings the NS over its critical mass, thus gravitationally collapsing to a BH. This process leads to the GRB emission, Ep. 2.[...] Aims: We analyze the spectra and time variability of Ep. 1 and 2 and compute the relevant parameters of the binary progenitor[...] in the IGC paradigm. Methods: We perform a time-resolved spectral analysis of Ep. 1 with a blackbody (BB) plus a power-law (PL) spectral model. We analyze Ep. 2 within the Fireshell model, identifying the Proper-GRB (P-GRB) and simulating the light curve and spectrum. We establish the redshift to be z=0.75 [...]. Results: We find for Ep. 1 a BB temperature following a broken PL with time, with the PL slopes at early and late times \alpha=0 and \beta=-4+/-2, respectively, and a break at t=41.21s. The total energy of Ep. 1 and 2 are E_{iso}^1=1.42x10^{53}erg and E_{iso}^2=2.43x10^{52}erg, respectively. We find at transparency a Lorentz factor \Gamma~173, laboratory radius of 6.04x10^{13}cm, P-GRB observed temperature kT_{P-GRB}=12.36keV, baryon load B=0.0057 and P-GRB energy E_{P-GRB}=3.44x10^{50}erg. [...] Conclusions: We interpret GRB110709B as a member of the IGC sources, together with GRB970828, GRB090618 and GRB101023. The XRT data during Ep. 2 offers an unprecedented tool for improving the diagnostic of GRBs emission.
Zauderer et al. 2013: ApJ 767, 161: Illuminating the Darkest Gamma-Ray Bursts with Radio Observations
1411.7377 from 1 Dec 14
Enrique Moreno M�ndez et al.: Three-Peak GRBs and Their Implications for Central Engines
In this letter we unify into a single model the millisecond (ms) protomagnetar central-engine and the collapsar central-engine models. We suggest that such a scenario could produce GRBs with three peaks. One for the ms-protomagnetar stage, a second one for the BH-formation event and a third one for the collapsar phase. We find in the literature that GRB 110709B presents such light curve morphology. We show that not only the light curve, but also the photon index evolution and the delay between the prompt emission and the afterglow of the second central-engine activity phase point towards a model like the one proposed here.
1506.08470 from 30 Jun 15
Nissim Fraija et al.: Reviewing the case of the atypical central-engine activity in GRB 110709B
The unusual GRB 110709B triggered Swift/BAT twice, with a time difference of $\sim 11$ minutes. Its light curve presented three noticeable peaks but only two were originally identified. In this work, we describe each peak as due to a different central-engine phase: the first one is the millisecond-protomagnetar stage, the second one is the BH-formation collapse phase and the last one is the Collapsar scenario with a Blandford-Znajek engine. Additionally, we analyze and explain the afterglow phase evoking the standard fireball model. Our model can successfully describe the timescales, fluxes and spectral indices observed for GRB 110709B.
arXiv:1504.02482 single line in X-shooter spectrum of host: 2.09?
1606.02075 from 8 Jun 16
A. G. Pili et al.: Quark deconfinement in the proto-magnetar model of Long Gamma-Ray Bursts
We investigate the possible implications of quark deconfinement on the phenomenology of Long Gamma-Ray Bursts focusing, in particular, on the possibility to describe multiple prompt emission phases in the context of the proto-magnetar model. Starting from numerical models of rotating Hadron Stars and Quark Stars in full general relativity we track the electromagnetic spin-down evolution in both the hadronic and quark phase, linking the two families through conservation of baryon number and angular momentum. We give estimates of the timescales and the energetics involved in the spin-down process deriving, in the relevant spin range, the relation between the initial and the final masses and rotational energies, whenever hadron-quark conversion is possible. We show how the results can be used in relevant astrophysical cases such as the double burst GRB 110709B.

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