Gamma-ray Burst 121128A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:06:06 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.583d {+20h 02m 20s} (J2000),
                 300.662d {+20h 02m 39s} (current),
                 300.276d {+20h 01m 06s} (1950)
GRB_DEC:         +54.321d {+54d 19' 17"} (J2000),
                 +54.358d {+54d 21' 29"} (current),
                 +54.180d {+54d 10' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3894 [cnts]    Image_Peak=179 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   438     E_range: 15-50 keV
BKG_INTEN:       25721 [cnts]
BKG_TIME:        18318.07 SOD {05:05:18.07} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18337.21 SOD {05:05:37.21} UT
GRB_PHI:         175.48 [deg]
GRB_THETA:        24.56 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     9.79 [sigma]
IMAGE_SIGNIF:    7.30 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -3  +0  +0  +0  +0 
SUN_POSTN:       244.51d {+16h 18m 01s}  -21.37d {-21d 22' 11"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.08d {+04h 00m 20s}  +20.04d {+20d 02' 31"}
MOON_DIST:        89.45 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.28, 12.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      335.13, 70.91 [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 = 70.40,14.23 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(13.0<100sec) coincident with the FERMI_GBM event (trignum=375771953).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:06:16 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     375771953
GRB_RA:          278.733d {+18h 34m 56s} (J2000),
                 278.860d {+18h 35m 26s} (current),
                 278.243d {+18h 32m 58s} (1950)
GRB_DEC:         +28.667d {+28d 40' 00"} (J2000),
                 +28.678d {+28d 40' 40"} (current),
                 +28.626d {+28d 37' 32"} (1950)
GRB_ERROR:       16.72 [deg radius, statistical plus systematic]
GRB_INTEN:       107 [cnts/sec]
DATA_SIGNIF:     7.00 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18350.96 SOD {05:05:50.96} UT
GRB_PHI:         296.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.99
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      65%  GRB
2nd_MOST_LIKELY:  17%  Solar Flare
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       244.51d {+16h 18m 01s}  -21.37d {-21d 22' 11"}
SUN_DIST:         60.02 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:       60.09d {+04h 00m 21s}  +20.04d {+20d 02' 31"}
MOON_DIST:       118.56 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       57.40, 15.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      282.42, 51.73 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 152.63,3.25 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(13.0<100sec) coincident with the SWIFT_BAT event (trignum=539866).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:06:30 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     375771953
GRB_RA:          278.610d {+18h 34m 26s} (J2000),
                 278.722d {+18h 34m 53s} (current),
                 278.175d {+18h 32m 42s} (1950)
GRB_DEC:         +36.690d {+36d 41' 24"} (J2000),
                 +36.701d {+36d 42' 03"} (current),
                 +36.649d {+36d 38' 58"} (1950)
GRB_ERROR:       3.57 [deg radius, statistical only]
DATA_SIGNIF:     26.00 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18350.96 SOD {05:05:50.96} UT
GRB_PHI:         297.00 [deg]
GRB_THETA:        78.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       244.51d {+16h 18m 01s}  -21.37d {-21d 22' 12"}
SUN_DIST:         66.44 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:       60.09d {+04h 00m 21s}  +20.04d {+20d 02' 32"}
MOON_DIST:       112.55 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       65.19, 18.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      283.77, 59.72 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(13.0<100sec) coincident with the SWIFT_BAT event (trignum=539866).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:06:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     375771953
GRB_RA:          273.920d {+18h 15m 41s} (J2000),
                 274.026d {+18h 16m 06s} (current),
                 273.511d {+18h 14m 03s} (1950)
GRB_DEC:         +39.810d {+39d 48' 36"} (J2000),
                 +39.815d {+39d 48' 54"} (current),
                 +39.792d {+39d 47' 31"} (1950)
GRB_ERROR:       1.40 [deg radius, statistical only]
DATA_SIGNIF:     50.00 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18350.96 SOD {05:05:50.96} UT
GRB_PHI:         301.00 [deg]
GRB_THETA:        81.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 12"}
SUN_DIST:         67.10 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
MOON_POSTN:       60.09d {+04h 00m 21s}  +20.04d {+20d 02' 32"}
MOON_DIST:       112.29 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       67.12, 23.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      276.68, 63.16 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(13.0<100sec) coincident with the SWIFT_BAT event (trignum=539866).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:06:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     375771953
GRB_RA:          278.317d {+18h 33m 16s} (J2000),
                 278.435d {+18h 33m 44s} (current),
                 277.859d {+18h 31m 26s} (1950)
GRB_DEC:         +33.567d {+33d 34' 00"} (J2000),
                 +33.577d {+33d 34' 38"} (current),
                 +33.528d {+33d 31' 39"} (1950)
GRB_ERROR:       5.65 [deg radius, statistical plus systematic]
GRB_INTEN:       520 [cnts/sec]
DATA_SIGNIF:     24.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18350.96 SOD {05:05:50.96} UT
GRB_PHI:         297.00 [deg]
GRB_THETA:        75.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.27
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       244.51d {+16h 18m 01s}  -21.37d {-21d 22' 12"}
SUN_DIST:         63.75 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:       60.09d {+04h 00m 21s}  +20.04d {+20d 02' 32"}
MOON_DIST:       115.11 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       62.01, 18.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      282.66, 56.64 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 152.63,3.25 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(13.0<100sec) coincident with the SWIFT_BAT event (trignum=539866).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 28 Nov 12 05:06:37 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6715,   Sub_Num: 0
GRB_INTEN:      9.96 [sigma]   
GRB_TIME:       18352.52 SOD {05:05:52.52} UT
GRB_DATE:       16259 TJD;   333 DOY;   12/11/28
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.8000 and Time_Error=0.4000. 
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=375771953).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2012-11/2012-11-28T05-05-52.3124-07621-07056-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:07:28 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.5991d {+20h 02m 23.78s} (J2000),
                 300.6784d {+20h 02m 42.81s} (current),
                 300.2917d {+20h 01m 10.01s} (1950)
GRB_DEC:         +54.3012d {+54d 18' 04.3"} (J2000),
                 +54.3378d {+54d 20' 16.1"} (current),
                 +54.1601d {+54d 09' 36.4"} (1950)
GRB_ERROR:       5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.58e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.87 [sigma]
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18414.37 SOD {05:06:54.37} UT,   77.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.23 261.58 243.45
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 12"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.10d {+04h 00m 23s}  +20.04d {+20d 02' 35"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.27, 12.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      335.11, 70.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.34 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:07:47 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.5991d {+20h 02m 23.7s} (J2000),
                 300.6784d {+20h 02m 42.8s} (current),
                 300.2917d {+20h 01m 10.0s} (1950)
GRB_DEC:         +54.3012d {+54d 18' 04.3"} (J2000),
                 +54.3378d {+54d 20' 16.1"} (current),
                 +54.1601d {+54d 09' 36.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       62 [cnts]
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18414.37 SOD {05:06:54.37} UT,   77.2 [sec] since BAT Trigger Time
CENTROID_X:      286.82,  raw= 287  [pixels]
CENTROID_Y:      333.08,  raw= 333  [pixels]
ROLL:            230.60 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   82.69
GRB_POS_XRT_Z:   -39.77
IMAGE_URL:       sw00539866000msxps_rw.img
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 12"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.10d {+04h 00m 24s}  +20.04d {+20d 02' 36"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.27, 12.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      335.11, 70.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:07:39 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.5991d {+20h 02m 23.7s} (J2000),
                 300.6784d {+20h 02m 42.8s} (current),
                 300.2917d {+20h 01m 10.0s} (1950)
GRB_DEC:         +54.3012d {+54d 18' 04.3"} (J2000),
                 +54.3378d {+54d 20' 16.1"} (current),
                 +54.1601d {+54d 09' 36.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       62 [cnts]
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18414.37 SOD {05:06:54.37} UT,   77.2 [sec] since BAT Trigger Time
CENTROID_X:      286.82,  raw= 287  [pixels]
CENTROID_Y:      333.08,  raw= 333  [pixels]
ROLL:            230.60 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   82.69
GRB_POS_XRT_Z:   -39.77
IMAGE_URL:       sw00539866000msxps_rw.img
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 12"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.10d {+04h 00m 23s}  +20.04d {+20d 02' 36"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.27, 12.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      335.11, 70.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:09:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.583d {+20h 02m 20s} (J2000),
                 300.662d {+20h 02m 39s} (current),
                 300.276d {+20h 01m 06s} (1950)
GRB_DEC:         +54.321d {+54d 19' 17"} (J2000),
                 +54.358d {+54d 21' 29"} (current),
                 +54.180d {+54d 10' 49"} (1950)
GRB_DATE:        16259 TJD;   333 DOY;   12/11/28
GRB_TIME:        18337.21 SOD {05:05:37.21} UT
TRIGGER_INDEX:   438
GRB_PHI:         175.48 [deg]
GRB_THETA:        24.56 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.79 [sigma]
IMAGE_SIGNIF:    7.30 [sigma]
LC_URL:          sw00539866000msb.lc
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 13"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.11d {+04h 00m 27s}  +20.04d {+20d 02' 41"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.28, 12.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      335.13, 70.91 [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 = 70.40,14.23 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:10:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.589d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.325d {+54d 19' 31"} (J2000)
POINT_ROLL:      230.601d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18422.52 SOD {05:07:02.52} UT,   85.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.650
N_STARS:         164
X_OFFSET:        496 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00539866000msufc0085.fits
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 13"}
SUN_DIST:         89.66 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.13d {+04h 00m 30s}  +20.05d {+20d 02' 46"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:11:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.589d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.325d {+54d 19' 31"} (J2000)
POINT_ROLL:      230.601d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18422.52 SOD {05:07:02.52} UT,   85.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.650
N_STARS:         164
X_OFFSET:        496 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00539866000msufc0085.fits
SUN_POSTN:       244.51d {+16h 18m 02s}  -21.37d {-21d 22' 14"}
SUN_DIST:         89.66 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.13d {+04h 00m 31s}  +20.05d {+20d 02' 48"}
MOON_DIST:        89.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:13:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.589d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.325d {+54d 19' 31"} (J2000)
ROLL:            230.601d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18422.52 SOD {05:07:02.52} UT,   85.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     375772032
X_OFFSET:        778 [pixels]
Y_OFFSET:        680 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       938
Y_GRB_POS:       840
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0095.fits
SUN_POSTN:       244.51d {+16h 18m 03s}  -21.37d {-21d 22' 14"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.14d {+04h 00m 35s}  +20.05d {+20d 02' 53"}
MOON_DIST:        89.47 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:13:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.589d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.325d {+54d 19' 31"} (J2000)
ROLL:            230.601d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18422.52 SOD {05:07:02.52} UT,   85.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     375772032
X_OFFSET:        778 [pixels]
Y_OFFSET:        680 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       938
Y_GRB_POS:       840
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0095.fits
SUN_POSTN:       244.51d {+16h 18m 03s}  -21.37d {-21d 22' 14"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.15d {+04h 00m 35s}  +20.05d {+20d 02' 53"}
MOON_DIST:        89.47 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:15:26 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.6000d {+20h 02m 24.00s} (J2000),
                 300.6793d {+20h 02m 43.02s} (current),
                 300.2926d {+20h 01m 10.22s} (1950)
GRB_DEC:         +54.2997d {+54d 17' 58.9"} (J2000),
                 +54.3363d {+54d 20' 10.7"} (current),
                 +54.1586d {+54d 09' 31.0"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         16.11 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18422.00 SOD {05:07:02.00} UT,   84.8 [sec] since BAT Trigger Time
SUN_POSTN:       244.51d {+16h 18m 03s}  -21.37d {-21d 22' 15"}
SUN_DIST:         89.64 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.17d {+04h 00m 40s}  +20.05d {+20d 03' 01"}
MOON_DIST:        89.49 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.27, 12.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      335.11, 70.89 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 5.4 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14007
S. R. Oates (UCL-MSSL), S. D. Barthelmy (GSFC), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), C. B. Markwardt (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 05:05:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 121128A (trigger=539866). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 300.583, +54.321 which is
```
   RA(J2000) = 20h 02m 20s
   Dec(J2000) = +54d 19' 17"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 sec. The peak count rate was ~20,000 counts/sec (15-350 keV), at ~20 sec after the trigger.
The XRT began observing the field at 05:06:54.3 UT, 77.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 300.60067, 54.30060 which is equivalent to:
```
   RA(J2000)  = 20h 02m 24.16s
   Dec(J2000) = +54d 18' 02.2"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 82 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.08 x 10^21 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 1.58e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 85 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	20:02:24.01 = 300.60004
  DEC(J2000) = +54:17:59.2  =  54.29977
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 5.5 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.11 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.31.
Burst Advocate for this burst is S. R. Oates (sro AT mssl.ucl.ac.uk). 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:     Wed 28 Nov 12 05:19:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
POINT_ROLL:      230.600d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18634.82 SOD {05:10:34.82} UT,   297.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.427
N_STARS:         87
X_OFFSET:        458 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1319 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00539866000msufc0297.fits
SUN_POSTN:       244.52d {+16h 18m 04s}  -21.37d {-21d 22' 17"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.20d {+04h 00m 48s}  +20.05d {+20d 03' 14"}
MOON_DIST:        89.49 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:20:04 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     539866,   Seg_Num: 0
GRB_RA:          300.5998d {+20h 02m 23.95s} (J2000),
                 300.6791d {+20h 02m 42.98s} (current),
                 300.2924d {+20h 01m 10.18s} (1950)
GRB_DEC:         +54.2997d {+54d 17' 58.9"} (J2000),
                 +54.3363d {+54d 20' 10.7"} (current),
                 +54.1586d {+54d 09' 31.0"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18537.00 SOD {05:08:57.00} UT,   199.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       244.52d {+16h 18m 04s}  -21.37d {-21d 22' 17"}
SUN_DIST:         89.64 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.21d {+04h 00m 49s}  +20.05d {+20d 03' 16"}
MOON_DIST:        89.50 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.27, 12.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      335.11, 70.89 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:19:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
POINT_ROLL:      230.600d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18634.82 SOD {05:10:34.82} UT,   297.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.427
N_STARS:         87
X_OFFSET:        458 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1319 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00539866000msufc0297.fits
SUN_POSTN:       244.52d {+16h 18m 04s}  -21.37d {-21d 22' 17"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.20d {+04h 00m 49s}  +20.05d {+20d 03' 15"}
MOON_DIST:        89.49 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:20:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
ROLL:            230.600d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18634.82 SOD {05:10:34.82} UT,   297.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     375772244
X_OFFSET:        778 [pixels]
Y_OFFSET:        680 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       938
Y_GRB_POS:       840
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0307.fits
SUN_POSTN:       244.52d {+16h 18m 04s}  -21.37d {-21d 22' 18"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.21d {+04h 00m 51s}  +20.06d {+20d 03' 18"}
MOON_DIST:        89.50 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:21:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
ROLL:            230.600d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  18634.82 SOD {05:10:34.82} UT,   297.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     375772244
X_OFFSET:        778 [pixels]
Y_OFFSET:        680 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       938
Y_GRB_POS:       840
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0307.fits
SUN_POSTN:       244.52d {+16h 18m 04s}  -21.37d {-21d 22' 18"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.22d {+04h 00m 52s}  +20.06d {+20d 03' 19"}
MOON_DIST:        89.50 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:27:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
POINT_ROLL:      230.599d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  19217.35 SOD {05:20:17.35} UT,   880.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.770
N_STARS:         190
X_OFFSET:        218 [pixels]
Y_OFFSET:        120 [pixels]
X_MAX:           1657 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00539866000msufc0880.fits
SUN_POSTN:       244.52d {+16h 18m 05s}  -21.37d {-21d 22' 21"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.27d {+04h 01m 05s}  +20.06d {+20d 03' 39"}
MOON_DIST:        89.52 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Nov 12 05:27:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
POINT_ROLL:      230.599d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  19217.35 SOD {05:20:17.35} UT,   880.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.770
N_STARS:         190
X_OFFSET:        218 [pixels]
Y_OFFSET:        120 [pixels]
X_MAX:           1657 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00539866000msufc0880.fits
SUN_POSTN:       244.52d {+16h 18m 05s}  -21.37d {-21d 22' 21"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.27d {+04h 01m 06s}  +20.06d {+20d 03' 40"}
MOON_DIST:        89.52 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:28:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
ROLL:            230.599d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  19217.35 SOD {05:20:17.35} UT,   880.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     375772827
X_OFFSET:        777 [pixels]
Y_OFFSET:        679 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       839
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0890.fits
SUN_POSTN:       244.52d {+16h 18m 05s}  -21.37d {-21d 22' 21"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.28d {+04h 01m 08s}  +20.06d {+20d 03' 44"}
MOON_DIST:        89.52 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 28 Nov 12 05:29:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     539866,   Seg_Num: 0
POINT_RA:        300.587d {+20h 02m 21s} (J2000)
POINT_DEC:       +54.327d {+54d 19' 38"} (J2000)
ROLL:            230.599d
IMG_START_DATE:  16259 TJD;   333 DOY;   12/11/28
IMG_START_TIME:  19217.35 SOD {05:20:17.35} UT,   880.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     375772827
X_OFFSET:        777 [pixels]
Y_OFFSET:        679 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       839
BINNING_INDEX:   1
IM_URL:          sw00539866000msuni0890.fits
SUN_POSTN:       244.52d {+16h 18m 06s}  -21.37d {-21d 22' 21"}
SUN_DIST:         89.65 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       60.29d {+04h 01m 09s}  +20.06d {+20d 03' 45"}
MOON_DIST:        89.52 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.29, 12.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      335.15, 70.91 [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 #14008
J. Japelj (U. Ljubljana), N.R. Tanvir (U. Leicester), C. Guidorzi (U. Ferrara) report on behalf of a large collaboration report:
The 2-m Faulkes Telescope North automatically began observing GRB 121128A (Oates et al. GCN Circ. 14007) on November 28 2012, 05:07:51 UT corresponding to 134 seconds post burst trigger. We confirm the presence of a fading source at the optical afterglow candidate position reported by Oates et al. GCN Circ. 14007. In the first 10 s exposure, we measure a preliminary R magnitude of 14.5 +- 0.1, calibrated against nearby USNO-B1 stars.
The candidate was discovered automatically by the LT-TRAP pipeline.
GCN Circular #14009
N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Matulonis (Gemini) report on behalf of a larger collaboration:
We observed the counterpart of GRB 121128A (Oates et al. GCN 14007; Japelj et al. GCN 14008) with the GMOS-N spectrograph at Gemini-North, beginning at Nov 28 2012 06:06 UT, approximately 1hr post-burst. The afterglow is well detected and our provisional reduction shows a series of absorption lines of AlII, FeII, CIV, SiII, SiIV with a common redshift of z=2.20.
GCN Circular #14010
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-duration soft GRB 121128A (Swift-BAT trigger #539866: Oates et al., GCN 14007) triggered Konus-Wind at T0=3D18353.307s UT (05:05:53.307)
The burst light curve shows a multi-peaked structure with a total duration of ~30 s. The emission is seen up to 6 MeV.
As observed by Konus-Wind, the burst had a fluence of (7.0 =B1 0.6)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0+5.568 s, of (2.05 =B1 0.15)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured T0 to T0+16.640 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.94 =B1 0.14, the high energy photon index beta =3D -3.36 =B1 0.48, the peak energy Ep =3D 76 =B1 4 keV, chi2 =3D 82.6/87 dof.
The spectrum at the maximum count rate (measured T0 to T0+8.848 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D +0.87 =B1 0.13, the high energy photon index beta =3D -3.32 =B1 0.46, the peak energy Ep =3D 87 =B1 4 keV, chi2 =3D 69.4/60 dof.
Assuming the Gemini North redshift of z=3D2.20 (Tanvir et al., GCN 14009) and a standard cosmology model with H_0 =3D 71 km/s/Mpc, Omega_M =3D 0.27= , Omega_Lambda =3D 0.73: the isotropic energy release E_iso is (8.2 =B1 0.7)x10^52 erg, the isotropic peak luminosity L_iso_max is (7.7 =B1 0.6)x10^52 erg/s, and Ep_rest is (243 =B1 13) keV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB121128_T18353/
All the quoted results are preliminary.
GCN Circular #14011
D. M. Palmer (LANL),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), S. R. Oates (UCL-MSSL), T. Sakamoto (AGU), 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-119 to T+195 sec from the recent telemetry downlink, we report further analysis of BAT GRB 121128A (trigger #539866) (Oates, et al., GCN Circ. 14007). The BAT ground-calculated position is RA, Dec = 300.589, 54.301 deg which is
```
    RA(J2000)  =  20h 02m 21.3s
    Dec(J2000) = +54d 18' 02.6"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows a complex, multi-peaked structure. The burst began with a faint precursor at ~T-4 sec. The main emission started at ~T+10 sec, peaked at T+22 sec and continued until just after T+40 sec, with weak emission extending out to ~T+70 sec. T90 (15-350 keV) is 23.3 +- 1.6 sec (estimated error including systematics).
The time-averaged spectrum from T-0.00 to T+41.69 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.32 +- 0.18, and Epeak of 64.5 +- 6.8 keV (chi squared 33.43 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.9 +- 0.4 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+21.68 sec in the 15-150 keV band is 12.9 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.86 +- 0.04 (chi squared 62.32 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/539866/BA/
GCN Circular #14012
Sinead McGlynn (TUM/MPE) reports on behalf of the Fermi GBM Team:
"At 05:05:50.96 UT on 28 Nov 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 121128A (trigger 375771953/121128212) which was also detected by the Swift/BAT and UVOT (Oates et al. 2012, GCN 14007). The GBM on-ground location is consistent with the Swift UVOT position.
The angle from the Fermi LAT boresight is 83 degrees.
The GBM light curve shows two bright pulses with a duration (T90) of about 17s (50-300 keV). The time-averaged spectrum from T0-5.1 s to T0+27.6 s is best fit by a Band function with Epeak = 62.2 +/- 4.6 keV, alpha = -0.80 +/- 0.12, and beta = -2.41 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is (1.04 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.9 s in the 10-1000 keV band is 17.9 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #14013
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report:
The RAPTOR network of robotic optical telescopes made follow-up observations of Swift trigger 539866 (Oates, et al., GCN 14007). Our narrow-field RAPTOR-S telescope located in Los Alamos, NM, began imaging at 05:06:12.6 UT, 35.4 s after the Swift BAT trigger and during the period that the BAT was still detecting gamma-ray emission (Palmer, et al., GCN 14011). Starting during the gamma-ray emitting interval we detect a brightening counterpart that ultimately peaks at T+75s with a R-band equivalent magnitude of approximately 13.9 before beginning to fade. Our unfiltered images are calibrated to the USNO-B1 R-band.
GCN Circular #14015
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2286 s of XRT Photon Counting mode data and 2 UVOT images for GRB 121128A, 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 = 300.60001, +54.29971 which is equivalent to:
```
RA (J2000): 20h 02m 24.00s
Dec (J2000): +54d 17' 58.9"
```
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 #14016
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 S.R. Oates report on behalf of the Swift-XRT team:
We have analysed 12 ks of XRT data for GRB 121128A (Oates et al. GCN Circ. 14007), from 66 s to 41.5 ks after the BAT trigger. The data comprise 108 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 Osborne et al. (GCN. Circ 14015).
The late-time light curve (from T0+6.9 ks) can be modelled with a power-law decay with a decay index of alpha=1.67 (+0.16, -0.15).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.43 (+/-0.11). The best-fitting absorption column is 1.2 (+/-0.4) x 10^22 cm^-2, at a redshift of 2.2, in addition to the Galactic value of 2.1 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.99 (+0.10, -0.09) and a best-fitting absorption column of 1.1 (+0.5, -0.4) x 10^22 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (6.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 2.1 x 10^21 cm^-2
Intrinsic column:    1.1 (+0.5, -0.4) x 10^22 cm^-2 at z=2.2
Photon index:	     1.99 (+0.10, -0.09)
```
If the light curve continues to decay with a power-law decay index of 1.59, the count rate at T+24 hours will be 3.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-13 (2.1 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00539866.
This circular is an official product of the Swift-XRT team.
GCN Circular #14017
S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121128A 85 s after the BAT trigger (Oates et al., GCN Circ. 14007). A source consistent with the XRT position (Osborne et al., GCN Circ. 14015) is detected in the initial white, v, b and u exposures only. The non-detection in the UV filters is consistent with the redshift of z=2.2 reported by Gemini North (Tanvir et al., GCN Circ. 14009)
The preliminary UVOT position is:
```
 RA  (J2000) =  20:02:24.00 = 300.60000 (deg.)
 Dec (J2000) = +54:17:59.1  =  54.29974 (deg.)
```
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white               85          235          147         16.19 +/- 0.03
v                  629          649           19         17.00 +/- 0.23
b                  554          573           20         17.51 +/- 0.17
u                  298          547          246         17.33 +/- 0.06
w1                 679         2173          175        >19.6
m2                 654         2496          214        >19.6
w2                 605         2447          214        >20.0
```
The magnitudes in the table are not corrected for the significant Galactic extinction due to the reddening of E(B-V) = 0.31 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14018
A.J. van der Horst (University of Amsterdam) reports on behalf of a large collaboration:
"We observed the position of the GRB 121128A afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope at November 28 11.34 to 21.06 UT, i.e. 6.2 - 16.0 hours after the burst (GCN 14007). We do not detect a radio source at the position of the optical counterpart (GCN 14007). The three-sigma rms noise in the map around that position is 69 microJy per beam. The formal flux measurement for a point source at the position of the optical counterpart is 59 +/- 23 microJy.
We would like to thank the WSRT staff for quickly scheduling and obtaining these observations."
GCN Circular #14019
A.Volnova (SAI MSU), E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of the Swift GRB 121128A (Oates et al., GCN 14007) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter of 60 s exposure on Nov. 28, between (UT) 10:27:30 - 13:43:09 under favorable weather conditions. We detected optical afterglow (Oates et al., GCN 14007; Japelj et al., GCN 14008) in stacked images. A photometry of some stacked image in the beginning of our observations and final stacked image is based on nearby USNO-B1.0 stars:
```
t_start, T0+ (mid), filter, exp., OT, err
(UT)     d                           s

10:46:51 0.24047 R     10x60 19.95 +/- 0.06
13:00:21 0.34123 R     49x40 20.58 +/- 0.07
```
The photometry is still preliminary.
GCN Circular #14023
T. Yoshii, R. Usui, Y.Aoki, S. Kurita, M. Hayashi, Y. Saito, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed GRB 121128A ( Oates et al., GCN Circular #14007) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation was started on 2012-11-28 08:49:50 UT ( ~13453 sec after the burst). We detected the previously reported afterglow ( Oates et al., GCN Circular #14007) in Ic band. The results of photometry (3sigma upper limits) are listed below.
The photon flux were calibrated against GSC2.3 catalog.
```
T0+[sec]      MID-UT     T-EXP[sec]     g'           Rc             Ic
-----------------------------------------------------------------------------
  14491      09:07:08        1800      > 19.4      > 19.1     17.92+/-0.14
-----------------------------------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14024
A.Volnova (SAI MSU, IKI), E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the field of the Swift GRB 121128A (Oates et al., GCN 14007) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter of 60 s exposure on Nov. 29, between (UT) 10:16:58- 13:33:38 under favorable weather conditions. We do not detect the optical afterglow (Oates et al., GCN 14007; Japelj et al., GCN 14008) in stacked images. A photometry of stacked image
```
t_start,      T0+ (mid), filter,  exp.,   UL (3 sigma)
(UT)          d                            s

10:16:58 1.28450      R       11200  22.1
```
is based on the same nearby USNO-B1.0 stars used in our previous observation (Volnova et al., GCN 14019):
```
USNO-B1.0       RA(J2000)     Dec(J2000) R
1442-0304687 20:02:23.58 +54:16:58.9 16.67
1442-0304744 20:02:29.58 +54:16:57.0 18.66
1442-0304807 20:02:36.33 +54:17:58.9 18.20
1443-0305750 20:02:37.10 +54:18:34.6 17.72
1443-0305710 20:02:32.72 +54:18:46.9 17.25
```
GCN Circular #14043
S.B. Pandey and Brajesh Kumar (ARIES Nainital, India, on behalf of larger Indian GRB collaboration)
We observed GRB 121128A (Swift trigger 539866, Oates et al. 2012, GCN Circ.14007) field with the 1.04m telescope at ARIES, Nainital starting at 2012-11-28 14:02:55 (UT). Several images in R_c and I_c pass-bands were obtained.
The optical afterglow candidate ( Oates et al. 2012, GCN Circ.14007, Japelj et al. 2012, GCN Circ. 14008) was clearly detected in our frames. The preliminary photometry of the co-added R_c (300sec x 3) and I_c (300sec x 3) frames yield following magnitudes.
```
--------------------------------------------------------------------------
Time (MID-UT)                Exp (sec)           Filter      Magnitude
--------------------------------------------------------------------------
2012-11-28, 14:12:11           900                 R_c      20.35 +/- 0.05
2012-11-28, 14:55:40           900                 I_c      19.65 +/- 0.11
--------------------------------------------------------------------------
```
Nearby USNO stars have been used for calibration.
This massage may be cited.
GCN Report 406.1
GCN_Report 406.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_406_1.pdf by S.R. Oates at UCL-MSSL titled: "Swift Observations of GRB 121128A"
GCN Circular #14201
Yu. Krugly (Institute of Astronomy of Kharkiv National University), R.Inasaridze, O. Kvaratskhelia(Abastumani Astrophysical Observatory), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift Swift GRB 121128A (Oates et al., GCN 14007)with AC-32 (0.7m Maksutov) telescope of Abastumani Observatory, starting on Nov. 28 (UT) 15:28. We took several unfiltered images of 300 s exposure. We detected the afterglow (Oates et al., GCN 14007; Japelj et al., GCN 14008) in stacked images. The photometry of a the stacked image is based on USNO-B1.0 stars (R2):
```
Start,    T0+,        Filter,   Exp.,  OT
(UT)      (mid),days

15:27:50  0.4479      none      9x300  20.24 +/- 0.12
16:18:59  0.4853      none      8x300  20.35 +/- 0.16
17:09:58  0.5208      none      8x300  20.38 +/- 0.18
18:01:17  0.5544      none      9x300  20.55 +/- 0.22
18:46:44  0.5871      none      8x300  20.84 +/- 0.36
```
GCN Circular #14255
A. Pozanenko (IKI), A. Volnova (SAI MSU), A. Sergeev (Institute of Radio Astronomy of NASU), O. Burhonov (UBAI), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 121128A (Oates et al., GCN 14007) with AZT-22 telescope of Maidanak observatory starting on Nov. 30 (UT) 13:47:48 under mean seeing (FWHM) of about 1 arcsec. We obtained several images of 180 s exposure in R filter. The optical afterglow (Oates et al., GCN 14007; Japelj et al., GCN 14008) is not detected in our images. A photometry of the stacked image is based on nearby USNO-B1.0 stars:
```
t_start, T0+ (mid), filter, exp.,   OT,  Upper Limit(3sigma)
(UT)     d                  s

13:47:48 2.37924    R      15x180   n/d  23.7
```

GCN Circular #14256
A.Volnova (SAI MSU), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We report revised results of our observations in Mondy observatory (GCNs 14019, 14024) of the afterglow of GRB 121128A (Oates et al., GCN 14007; Japelj et al., GCN 14008). We re-processed data obtained on Nov. 28,29 and Dec. 02 based on full data set obtained.

Nov. 28
  t_start, filter, exp,      T-t0,   OT,  err
  UT               s         d

  10:27:30 R     4*30+16*60 0.23024 19.79 0.05
  10:46:51 R    10*60       0.24047 19.85 0.04
  10:56:58 R    10*60       0.24751 19.78 0.04
  11:07:06 R    10*60       0.25454 19.96 0.05
  11:17:14 R    8*60+12*40  0.26674 19.95 0.05
  11:42:14 R    25*40       0.28132 20.07 0.05
  11:59:13 R    30*40       0.29429 20.12 0.05
  12:19:36 R    30*40       0.30845 20.06 0.04
  12:39:58 R    30*40       0.32259 20.24 0.05
  13:00:21 R    64*40       0.34488 20.32 0.04

Nov. 29
  t_start, filter, exp,      T-t0,   OT,  UL(3sigma)
  UT               s         d

10:16:58  R      6220      1.27406 n/d  23.3

Dec. 02
  t_start, filter, exp,      T-t0,   OT,  UL(3sigma)
  UT               s         d
10:47:17  R      4920      4.32854 n/d  21.2

The photometry is based on following reference stars

  1442-0304687 20:02:23.58 +54:16:58.9 16.67
  1442-0304744 20:02:29.58 +54:16:57.0 18.66
  1442-0304807 20:02:36.33 +54:17:58.9 18.20
  1443-0305750 20:02:37.10 +54:18:34.6 17.72
  1443-0305710 20:02:32.72 +54:18:46.9 17.25

The combined light curve of our observations (this circular, GCN 14201 and GCN 14255) can be found at http://grb.rssi.ru/GRB121128A/GRB121128A_lc2.PNG
Non-filtered photometry of Abastumani observatory (GCN 14201) is corrected to the R as d(C-R)=-0.034. One can see non-monotonous behavior of the lc between 0.4 -- 0.4 days after trigger, and probable jet brake between 0.6 and 1.3 days.

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Jochen Greiner, last update: 04-Mar-2013 [Disclaimer]