Gamma-ray Burst 111123A

(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:     Wed 23 Nov 11 18:14:07 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.851d {+10h 19m 24s} (J2000),
                 154.993d {+10h 19m 58s} (current),
                 154.255d {+10h 17m 01s} (1950)
GRB_DEC:         -20.642d {-20d 38' 28"} (J2000),
                 -20.701d {-20d 42' 04"} (current),
                 -20.390d {-20d 23' 23"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14597 [cnts]    Image_Peak=370 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       119222 [cnts]
BKG_TIME:        65544.39 SOD {18:12:24.39} UT
BKG_DUR:         40 [sec]
GRB_DATE:        15888 TJD;   327 DOY;   11/11/23
GRB_TIME:        65601.10 SOD {18:13:21.10} UT
GRB_PHI:         167.35 [deg]
GRB_THETA:        26.02 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.87 [sigma]
IMAGE_SIGNIF:    8.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -1  +0  +0 -21  +0 
SUN_POSTN:       238.96d {+15h 55m 51s}  -20.38d {-20d 22' 38"}
SUN_DIST:         77.57 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.81d {+14h 27m 14s}  -17.59d {-17d 35' 17"}
MOON_DIST:        58.13 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      165.15,-28.79 [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 = 205.21,-8.83 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:15:36 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.8451d {+10h 19m 22.82s} (J2000),
                 154.9869d {+10h 19m 56.85s} (current),
                 154.2494d {+10h 17m 00.15s} (1950)
GRB_DEC:         -20.6449d {-20d 38' 41.6"} (J2000),
                 -20.7049d {-20d 42' 17.5"} (current),
                 -20.3935d {-20d 23' 36.6"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.48e-09 [erg/cm2/sec]
GRB_SIGNIF:      13.19 [sigma]
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65700.48 SOD {18:15:00.48} UT,   99.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.23 261.46 243.74
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 39"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.83d {+14h 27m 18s}  -17.59d {-17d 35' 31"}
MOON_DIST:        58.15 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      165.14,-28.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.38 arcmin from the BAT position.  
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 23 Nov 11 18:15:47 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.8451d {+10h 19m 22.8s} (J2000),
                 154.9869d {+10h 19m 56.8s} (current),
                 154.2494d {+10h 17m 00.1s} (1950)
GRB_DEC:         -20.6449d {-20d 38' 41.6"} (J2000),
                 -20.7049d {-20d 42' 17.5"} (current),
                 -20.3935d {-20d 23' 36.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       174 [cnts]
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65700.48 SOD {18:15:00.48} UT,   99.4 [sec] since BAT Trigger Time
CENTROID_X:      315.02,  raw= 315  [pixels]
CENTROID_Y:      288.26,  raw= 288  [pixels]
ROLL:            107.37 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -22.94
GRB_POS_XRT_Z:   26.69
IMAGE_URL:       sw00508319000msxps_rw.img
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 39"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.83d {+14h 27m 19s}  -17.59d {-17d 35' 33"}
MOON_DIST:        58.15 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      165.14,-28.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:15:56 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.8451d {+10h 19m 22.8s} (J2000),
                 154.9869d {+10h 19m 56.8s} (current),
                 154.2494d {+10h 17m 00.1s} (1950)
GRB_DEC:         -20.6449d {-20d 38' 41.6"} (J2000),
                 -20.7049d {-20d 42' 17.5"} (current),
                 -20.3935d {-20d 23' 36.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       174 [cnts]
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65700.48 SOD {18:15:00.48} UT,   99.4 [sec] since BAT Trigger Time
CENTROID_X:      315.02,  raw= 315  [pixels]
CENTROID_Y:      288.26,  raw= 288  [pixels]
ROLL:            107.37 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -22.94
GRB_POS_XRT_Z:   26.69
IMAGE_URL:       sw00508319000msxps_rw.img
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 39"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.83d {+14h 27m 19s}  -17.59d {-17d 35' 34"}
MOON_DIST:        58.15 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      165.14,-28.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:17:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.851d {+10h 19m 24s} (J2000),
                 154.993d {+10h 19m 58s} (current),
                 154.255d {+10h 17m 01s} (1950)
GRB_DEC:         -20.642d {-20d 38' 28"} (J2000),
                 -20.701d {-20d 42' 04"} (current),
                 -20.390d {-20d 23' 23"} (1950)
GRB_DATE:        15888 TJD;   327 DOY;   11/11/23
GRB_TIME:        65601.10 SOD {18:13:21.10} UT
TRIGGER_INDEX:   298
GRB_PHI:         167.35 [deg]
GRB_THETA:        26.02 [deg]
DELTA_TIME:      -69.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.87 [sigma]
IMAGE_SIGNIF:    8.20 [sigma]
LC_URL:          sw00508319000msb.lc
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 40"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.84d {+14h 27m 22s}  -17.60d {-17d 35' 44"}
MOON_DIST:        58.16 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      165.15,-28.79 [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 = 205.21,-8.83 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:18:07 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.856d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.641d {-20d 38' 26"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65710.92 SOD {18:15:10.92} UT,   109.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.075
N_STARS:         42
X_OFFSET:        442 [pixels]
Y_OFFSET:        612 [pixels]
X_MAX:           1401 [pixels]
Y_MAX:           1571 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00508319000msufc0109.fits
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 40"}
SUN_DIST:         77.57 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.85d {+14h 27m 25s}  -17.60d {-17d 35' 55"}
MOON_DIST:        58.17 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:18:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.856d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.641d {-20d 38' 26"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65710.92 SOD {18:15:10.92} UT,   109.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.075
N_STARS:         42
X_OFFSET:        442 [pixels]
Y_OFFSET:        612 [pixels]
X_MAX:           1401 [pixels]
Y_MAX:           1571 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00508319000msufc0109.fits
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 41"}
SUN_DIST:         77.57 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.86d {+14h 27m 26s}  -17.60d {-17d 35' 58"}
MOON_DIST:        58.17 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:19:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.856d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.641d {-20d 38' 26"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65710.92 SOD {18:15:10.92} UT,   109.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     343764918
X_OFFSET:        762 [pixels]
Y_OFFSET:        932 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       922
Y_GRB_POS:       1092
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0117.fits
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 41"}
SUN_DIST:         77.57 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.87d {+14h 27m 28s}  -17.60d {-17d 36' 08"}
MOON_DIST:        58.18 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:19:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.856d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.641d {-20d 38' 26"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65710.92 SOD {18:15:10.92} UT,   109.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     343764918
X_OFFSET:        762 [pixels]
Y_OFFSET:        932 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       922
Y_GRB_POS:       1092
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0117.fits
SUN_POSTN:       238.97d {+15h 55m 52s}  -20.38d {-20d 22' 41"}
SUN_DIST:         77.57 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.87d {+14h 27m 29s}  -17.60d {-17d 36' 11"}
MOON_DIST:        58.18 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:24:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65868.93 SOD {18:17:48.93} UT,   267.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.255
N_STARS:         31
X_OFFSET:        442 [pixels]
Y_OFFSET:        612 [pixels]
X_MAX:           1401 [pixels]
Y_MAX:           1571 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00508319000msufc0267.fits
SUN_POSTN:       238.97d {+15h 55m 53s}  -20.38d {-20d 22' 44"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.92d {+14h 27m 40s}  -17.61d {-17d 36' 51"}
MOON_DIST:        58.22 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:24:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65868.93 SOD {18:17:48.93} UT,   267.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.255
N_STARS:         31
X_OFFSET:        442 [pixels]
Y_OFFSET:        612 [pixels]
X_MAX:           1401 [pixels]
Y_MAX:           1571 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00508319000msufc0267.fits
SUN_POSTN:       238.97d {+15h 55m 53s}  -20.38d {-20d 22' 44"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.92d {+14h 27m 41s}  -17.62d {-17d 36' 54"}
MOON_DIST:        58.22 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:25:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65868.93 SOD {18:17:48.93} UT,   267.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     343765076
X_OFFSET:        762 [pixels]
Y_OFFSET:        932 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       922
Y_GRB_POS:       1092
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0275.fits
SUN_POSTN:       238.97d {+15h 55m 53s}  -20.38d {-20d 22' 44"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.93d {+14h 27m 44s}  -17.62d {-17d 37' 04"}
MOON_DIST:        58.23 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:25:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  65868.93 SOD {18:17:48.93} UT,   267.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     343765076
X_OFFSET:        762 [pixels]
Y_OFFSET:        932 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       922
Y_GRB_POS:       1092
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0275.fits
SUN_POSTN:       238.97d {+15h 55m 54s}  -20.38d {-20d 22' 45"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.94d {+14h 27m 44s}  -17.62d {-17d 37' 06"}
MOON_DIST:        58.24 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:29:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  66471.65 SOD {18:27:51.65} UT,   870.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.168
N_STARS:         61
X_OFFSET:        202 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1811 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00508319000msufc0870.fits
SUN_POSTN:       238.98d {+15h 55m 54s}  -20.38d {-20d 22' 47"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.98d {+14h 27m 54s}  -17.63d {-17d 37' 43"}
MOON_DIST:        58.27 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:30:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
POINT_ROLL:      107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  66471.65 SOD {18:27:51.65} UT,   870.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.168
N_STARS:         61
X_OFFSET:        202 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1811 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00508319000msufc0870.fits
SUN_POSTN:       238.98d {+15h 55m 54s}  -20.38d {-20d 22' 47"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.98d {+14h 27m 55s}  -17.63d {-17d 37' 45"}
MOON_DIST:        58.28 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:30:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     508319,   Seg_Num: 0
GRB_RA:          154.8463d {+10h 19m 23.11s} (J2000),
                 154.9881d {+10h 19m 57.14s} (current),
                 154.2506d {+10h 17m 00.13s} (1950)
GRB_DEC:         -20.6452d {-20d 38' 42.7"} (J2000),
                 -20.7052d {-20d 42' 18.6"} (current),
                 -20.3938d {-20d 23' 37.7"} (1950)
GRB_ERROR:       3.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  66315.00 SOD {18:25:15.00} UT,   713.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       238.98d {+15h 55m 54s}  -20.38d {-20d 22' 47"}
SUN_DIST:         77.59 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.98d {+14h 27m 56s}  -17.63d {-17d 37' 48"}
MOON_DIST:        58.29 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.37, 29.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      165.14,-28.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Nov 11 18:31:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  66471.65 SOD {18:27:51.65} UT,   870.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     343765679
X_OFFSET:        761 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       921
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0878.fits
SUN_POSTN:       238.98d {+15h 55m 54s}  -20.38d {-20d 22' 47"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      216.99d {+14h 27m 58s}  -17.63d {-17d 37' 56"}
MOON_DIST:        58.29 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 23 Nov 11 18:31:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     508319,   Seg_Num: 0
POINT_RA:        154.855d {+10h 19m 25s} (J2000)
POINT_DEC:       -20.643d {-20d 38' 33"} (J2000)
ROLL:            107.373d
IMG_START_DATE:  15888 TJD;   327 DOY;   11/11/23
IMG_START_TIME:  66471.65 SOD {18:27:51.65} UT,   870.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     343765679
X_OFFSET:        761 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       921
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00508319000msuni0878.fits
SUN_POSTN:       238.98d {+15h 55m 55s}  -20.38d {-20d 22' 47"}
SUN_DIST:         77.58 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      217.00d {+14h 27m 59s}  -17.63d {-17d 37' 59"}
MOON_DIST:        58.29 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      261.38, 29.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      165.15,-28.79 [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 #12587
M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), A. Y. Lien (NASA/GSFC/ORAU), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), R. L. C. Starling (U Leicester), G. Stratta (ASDC), G. Tagliaferri (INAF-OAB), E. Troja (NASA/GSFC/ORAU), T. N. Ukwatta (MSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
At 18:13:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111123A (trigger=508319). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 154.851, -20.642 which is
```
   RA(J2000)  =  10h 19m 24s
   Dec(J2000) = -20d 38' 28"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a few overlapping peaks from T-10 to T+30 sec and then a strong peak from T+60 to T+160 sec, with a total duration of about 170 sec. The peak count rate was ~1400 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 18:15:00.5 UT, 99.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 154.8464, -20.6453 which is equivalent to:
```
   RA(J2000)  = 10h 19m 23.14s
   Dec(J2000) = -20d 38' 43.1"
```
with an uncertainty of 3.3 arcseconds (radius, 90% containment). This location is 20 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. The XRT light curve shows correlated activity with BAT, rising to peak followed by fading.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 5.78 x 10^20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 8.48e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 109 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 M. Stamatikos (Michael.Stamatikos-1 AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #12589
D. Xu (WIS), X.-H. Zhao, J.-M. Bai (YNAO) report:
We observed the field of GRB 111123A (Stamatikos et al., GCN 12587) with the 2.4m Gao-Mei-Gu (GMG) telescope equipped with YFOSC, and obtained 3x600s R-band and 3x600s I-band images, starting at 21:00:56 UT on Nov. 23rd (i.e., 2.793 hrs after the burst).
Within the XRT SPER error circle (http://www.swift.ac.uk/sper/), no optical source was detected in the stacked I-band image, and a weak and compact source was found in the stacked R-band image at coordinates
```
RA(J2000)  =  10:19:23.10
Dec(J2000) = -20:38:41.72
```
with an uncertainty of ~1" in each coordinate. We caution that the above source may be ascribed to background fluctuation. In this sense, we derive R>~23.7 mag, calibrated with the #0693-0243590 star (R1=17.95 and R2=17.60) in the USNO B1 catalog.
Deeper and NIR observations are encouraged.
We are grateful to Chuan-Jun Wang, De-Qing Wang, and Yan-Dong Lang for performing these observations.
GCN Circular #12590
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 2720 s of XRT Photon Counting mode data and 6 UVOT images for GRB 111123A, 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 = 154.84638, -20.64469 which is equivalent to:
```
RA (J2000): 10h 19m 23.13s
Dec (J2000): -20d 38' 40.9"
```
with an uncertainty of 1.7 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 #12591
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 111123A (Stamatikos et al., GCNC 12587) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2011-11-23 18:30:27 UT (~17 min after the burst). We did not find any new point source within the enhanced XRT circle (Goad, et al., GCNC 12590) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.01541    18:35:32     540.0    >18.9 >18.9  >18.3
0.04573    19:19:12    5820.0    >20.4 >20.2  >19.6
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #12592
G. Stratta (ASDC), D.N. Burrows (PSU), J.A. Kennea (PSU), M.C. Stroh (PSU), O.M. Littlejohns (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and M. Stamatikos report on behalf of the Swift-XRT team:
We have analysed 11 ks of XRT data for GRB 111123A (Stamatikos et al. GCN Circ. 12587), from 88 s to 35.6 ks after the BAT trigger. The data comprise 656 s 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 Goad et al. (GCN. Circ 12590).
The late-time light curve (from T0+4.2 ks) can be modelled with a power-law decay with a decay index of alpha=0.86 (+/-0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.715 (+/-0.026). The best-fitting absorption column is 2.62 (+0.10, -0.09) x 10^21 cm^-2, in excess of the Galactic value of 5.8 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.43 (+0.19, -0.18) and a best-fitting absorption column of 2.0 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.0 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 5.8 x 10^20 cm^-2
Excess significance: 7.4 sigma
Photon index:	     2.43 (+0.19, -0.18)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00508319.
This circular is an official product of the Swift-XRT team.
GCN Circular #12593
D. Fugazza (INAF-OAB), V. D'Elia (INAF-OAR), P. D'Avanzo, A. Melandri (INAF-OAB) and E. Palazzi (INAF-IASFBo) on behalf of a larger collaboration report:
We observed the field of GRB 111123A (Stamatikos et al. GCN 12587) with the 3.6m TNG equipped with the NICS near-infrared camera. A sequence of JHK band images were acquired starting on Nov 24.238 UT (i.e. ~11.5 hours after the burst event).
An object is detected in a stacked 20 min exposure image inside the enhaced XRT error circle (Goad et al. GCN 12590) at the following coordinates (J2000):
```
R.A. = 10:19:23.14
Dec. = -20:38:41.0
```
with an uncertainty of ~ 0.3", consistent with the position of the object reported by Xu et al. (GCN 12589). The source has a magnitude K=19.4 +/- 0.3 (calibrated against the 2MASS catalogue). The source is not detected in the shorter exposures (10 min) J and H-band images down to the following 3sigma upper limits: J>19.7, H>20.5. At the present stage, it is not possible to say anything about source variability.
We thank the TNG staff for their support, in particular Luca Di Fabrizio.
GCN Circular #12594
P. D'Avanzo (INAF-OAB) on behalf of a larger collaboration report:
The TNG NIR 3sigma upper limits of GRB 111123A reported in Fugazza et al. (GCN 12593) has been written in the wrong order. The correct values are:
```
J>20.5
H>19.7
```
(calibrated against the 2MASS catalogue). We confirm the K-band detection.
We apologize for the confusion that our previous report may have caused.
GCN Circular #12595
A. Rossi, A. Nicuesa Guelbenzu, S. Klose (all Tautenburg), P. Afonso (American River College), and J. Greiner (MPE) report on behalf of the GROND team:
We observed the field of GRB 111123A (Stamatikos, GCN 12587) 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 on La Silla. Observations started at 6:30 UT on November 24, about 12 hr after the burst, and continued for about 1.5 hr. They were performed at an average seeing of 1 arcsec and an average airmass of 1.5.
We do not detect the source discovered by Xu et al. (GCN 12589; see also Fugazza et al. GCN 12593). At a mean time of November 24, 7:10 UT, we measure the following preliminary upper limits (AB magnitudes):
```
  g' > 24.5,
  r' > 24.6,
  i' > 23.7,
  J  > 21.2,
  H  > 20.9,
  K  > 19.9.
```
The data are calibrated against GROND zeropoints and 2MASS field stars.
GCN Circular #12596
A. De Cia (U. of Iceland), D. Xu (WIS), N.R. Tanvir (U. of Leicester), G. Leloudas, D. Malesani (DARK), G. Maciejewski (U. Nicolaus Copernicus), A. de Ugarte Postigo (IAA/CSIC), J.P.U. Fynbo (DARK) and P. Jakobsson (U. of Iceland) report:
We observed the field of GRB 111123A (Stamatikos et al., GCN 12587, Fugazza et al. 12593) with the NOT equipped with ALFOSC at the end of the night in La Palma, when the humidity dropped below the observability threshold. Observations were carried out in the R filter for 30 minutes, starting at 5:59 UT, with a mean time of 12.02 hours after the GRB trigger.
No significant source was detected at the position of the candidate optical afterglow (Xu et al., GCN 12589) down to R>~24.4 mag, calibrated against USNO-B1stars.
GCN Circular #12597
S. T. Holland (CRESST/USRA/GSFC) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 111123A starting 90 s after the BAT trigger (Stamatikos et al., 2011, GCNC 12587). Settled observations started at 110 s. We do not detect an optical afterglow at the location of the optical and near-infrared afterglow (Xu et al., 2011, GCNC 12589; Fugazza et al., 2011, GCNC 12593) 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)      110         260       147     >21.2
    u (FC)      268         518       246     >20.3
white (FC)      871         934        62     >20.1
---------------------------------------------------
   v            598        5999       430     >20.2
   b            524        6711       325     >20.7
   u            268        6614       678     >20.8
uvw1            647        6409       432     >20.6
uvm2            622        6204       432     >20.6
uvw2            573        5795       432     >20.9
white           110        5589       445     >21.7
---------------------------------------------------
```
The quoted magnitudes and upper limits have not been corrected for the Galactic extinction along the line of sight to this burst of E_{B-V} = 0.05 mag (Schlegel et al. 1998, ApJS, 500, 525).
GCN Circular #12598
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 111123A (trigger #508319) (Stamatikos, et al., GCN Circ. 12587). The BAT ground-calculated position is RA, Dec = 154.845, -20.639 deg which is
```
  RA(J2000)  =  10h 19m 22.9s 
  Dec(J2000) = -20d 38' 19.9" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 81%.
The mask-weighted light curve shows two episodes. The first episode is starting at T-10 sec, and peaking at T+10 sec with possible two or three overlapping pulses. The second episode shows a gradual increases after the end of the initial episode, peaks at T+150 sec, and ends at T+170 sec. The low level emission continues up to T+~300 sec. T90 (15-350 keV) is 290.0 +- 88.1 sec (estimated error including systematics).
The time-averaged spectrum from T-8.7 to T+481.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.68 +- 0.07. The fluence in the 15-150 keV band is 7.3 +- 0.3 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+146.30 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/508319/BA/
GCN Circular #12613
We observed the field of GRB 111123A (Stamatikos et al. GCN 12587) with Shajn telescope of CrAO observatory on Nov. 25 between (UT) 02:48 and 03:44 under a mean seeing of 2.0 arsces and large airmass. We took several frames with exposure of 60 s in I-band. Within enhanced Swift-XRT position (Goad et al. GCN 12590) we do not detected the optical counterpart (Xu et al., GCN 12589; Fugazza et al., GCN 12593). A photometry is based on the USNO B1.0 star 0693-0243552 (10 19 20.57, -20 39 18.7, J2000) assuming I=16.85.
```
T_start UT  T0+        Filter, Exposure, OT,  uplim (3 sigma)
                  (mid, d)            (s)
02:48:33     1.89584   I       49x60      n/d    22.2
```
GCN Circular #12615
The text of the GCN circular #12613 should be corrected as following. I apologize for possible inconvenience.
V. Rumyantsev, (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 111123A (Stamatikos et al. GCN 12587) with Shajn telescope of CrAO observatory on Nov. 25 between (UT) 02:48 and 03:44 under a mean seeing of 2.0 arsces and large airmass. We took several frames with exposure of 60 s in I-band. Within enhanced Swift-XRT position (Goad et al. GCN 12590) we do not detected the optical counterpart (Xu et al., GCN 12589; Fugazza et al., GCN 12593). A photometry is based on the USNO B1.0 star 0693-0243552 (10 19 20.57, -20 39 18.7, J2000) assuming I=16.85.
T_start UT T0+ Filter, Exposure, OT, uplim (3 sigma) (mid, d) (s) 02:48:33 1.89584 I 49x60 n/d 22.2
GCN Circular #14273
SUBJECT: GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
D. Xu, D. Malesani, T. Kruehler, J. P. U. Fynbo (DARK/NBI), D. A. Perley (Caltech), P. Goldoni (APC/Univ. Paris 7 and SAp/CEA), L. Kaper (U. Amsterdam), A. de Ugarte Postigo (IAA-CSIC and DARK/NBI), N. R. Tanvir (U. Leicester) report on behalf of the X-shooter GTO GRB collaboration:
We observed the field of GRB 111123A (Stamatikos et al., GCN 12587) using the Keck-I telescope equipped with the LRIS instrument. Observations were carried out on 2013 February 10 (~444 days after the burst), simultaneously in the g and I bands, for a total exposure time of 750 and 720 s, respectively.
An extended source with g=25.83 (AB) and I = 23.55 (Vega) is detected at the position of the optical and NIR afterglow (Xu et al., GCN 12589; Fugazza et al., GCN 12593), where the positional error radius of the optical afterglow has been reduced from ~1.0" to ~0.3" through a refined analysis. We thus consider the source to be the host galaxy of GRB 111123A.
A spectrum of this source was taken on 2013 March 07 with the ESO VLT equipped with the X-shooter spectrograph, featuring NIR/VIS/UVB three arms and covering the wavelength range 3000-25000 AA. The exposure time was 4x600 s. In the NIR arm, we detect four emission lines, interpreted as [O III] (5007), [NeIII] (3869), [O II] (3727), and Hbeta (a marginal detection), all at a common redshift z = 3.1516. In the UVB arm, the host continuum is detected down to ~5100 AA, thus corresponds to the onset of the Lyman alpha forest at the proposed redshift.
We acknowledge excellent support from the observing staff at Mauna Kea and Paranal, in particular Emanuela Pompei, Claudio Melo, and Andres Pino.

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Jochen Greiner, last update: 08-Mar-2013 [Disclaimer]