Gamma-ray Burst 151229A

(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:     Tue 29 Dec 15 06:50:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     668689,   Seg_Num: 0
GRB_RA:          329.380d {+21h 57m 31s} (J2000),
                 329.602d {+21h 58m 24s} (current),
                 328.685d {+21h 54m 44s} (1950)
GRB_DEC:         -20.729d {-20d 43' 42"} (J2000),
                 -20.652d {-20d 39' 06"} (current),
                 -20.967d {-20d 58' 02"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3171 [cnts]    Image_Peak=408 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   41     E_range: 25-100 keV
BKG_INTEN:       18710 [cnts]
BKG_TIME:        24616.37 SOD {06:50:16.37} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17385 TJD;   363 DOY;   15/12/29
GRB_TIME:        24627.96 SOD {06:50:27.96} UT
GRB_PHI:         -125.26 [deg]
GRB_THETA:        32.42 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     61.35 [sigma]
IMAGE_SIGNIF:    17.29 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +5  +0  +0 -67  +0 
SUN_POSTN:       277.86d {+18h 31m 26s}  -23.24d {-23d 14' 23"}
SUN_DIST:         47.81 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      145.19d {+09h 40m 45s}  +11.19d {+11d 11' 21"}
MOON_DIST:       169.63 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       32.44,-49.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      324.32, -7.77 [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 = 155.94,20.00 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=473064631).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 29 Dec 15 06:50:53 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     473064631
GRB_RA:          332.350d {+22h 09m 24s} (J2000),
                 332.561d {+22h 10m 15s} (current),
                 331.690d {+22h 06m 46s} (1950)
GRB_DEC:          -8.500d {-08d 30' 00"} (J2000),
                  -8.421d {-08d 25' 15"} (current),
                  -8.746d {-08d 44' 44"} (1950)
GRB_ERROR:       8.02 [deg radius, statistical plus systematic]
GRB_INTEN:       485 [cnts/sec]
DATA_SIGNIF:     17.70 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        17385 TJD;   363 DOY;   15/12/29
GRB_TIME:        24627.95 SOD {06:50:27.95} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      1.62
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      80%  GRB
2nd_MOST_LIKELY:  13%  Generic SGR
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       277.86d {+18h 31m 26s}  -23.24d {-23d 14' 23"}
SUN_DIST:         54.34 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      145.19d {+09h 40m 45s}  +11.19d {+11d 11' 20"}
MOON_DIST:       172.22 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       51.14,-47.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.29,  2.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn151229285/quicklook/glg_lc_medres34_bn151229285.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 92.62,-23.18 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=668689).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 29 Dec 15 06:51:05 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     473064631
GRB_RA:          329.060d {+21h 56m 14s} (J2000),
                 329.280d {+21h 57m 07s} (current),
                 328.372d {+21h 53m 29s} (1950)
GRB_DEC:         -18.110d {-18d 06' 35"} (J2000),
                 -18.034d {-18d 02' 00"} (current),
                 -18.348d {-18d 20' 52"} (1950)
GRB_ERROR:       6.14 [deg radius, statistical only]
DATA_SIGNIF:     17.80 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        17385 TJD;   363 DOY;   15/12/29
GRB_TIME:        24627.95 SOD {06:50:27.95} UT
GRB_PHI:          61.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       277.86d {+18h 31m 26s}  -23.24d {-23d 14' 23"}
SUN_DIST:         48.16 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      145.19d {+09h 40m 45s}  +11.19d {+11d 11' 19"}
MOON_DIST:       172.09 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       36.08,-48.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      324.94, -5.21 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn151229285/quicklook/glg_lc_medres34_bn151229285.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_473064631.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~4 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=668689).

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 29 Dec 15 06:51:09 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    7322,   Sub_Num: 0
GRB_INTEN:      9.27 [sigma]   
GRB_TIME:       24627.56 SOD {06:50:27.56} UT
GRB_DATE:       17385 TJD;   363 DOY;   15/12/29
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.8000 and Time_Error=0.4000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=473064631).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2015-12/2015-12-29T06-50-27.5121-28117-39824-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 06:52:00 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.414d {+21h 57m 39s} (J2000)
POINT_DEC:       -20.723d {-20d 43' 22"} (J2000)
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24714.91 SOD {06:51:54.91} UT,   87.0 [sec] since BAT Trigger Time
COUNTS:          18    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 06:54:06 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     668689,   Seg_Num: 0
GRB_RA:          329.380d {+21h 57m 31s} (J2000),
                 329.602d {+21h 58m 24s} (current),
                 328.685d {+21h 54m 44s} (1950)
GRB_DEC:         -20.729d {-20d 43' 42"} (J2000),
                 -20.652d {-20d 39' 06"} (current),
                 -20.967d {-20d 58' 02"} (1950)
GRB_DATE:        17385 TJD;   363 DOY;   15/12/29
GRB_TIME:        24627.96 SOD {06:50:27.96} UT
TRIGGER_INDEX:   41
GRB_PHI:         -125.26 [deg]
GRB_THETA:        32.42 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     61.35 [sigma]
IMAGE_SIGNIF:    17.29 [sigma]
LC_URL:          sw00668689000msb.lc
SUN_POSTN:       277.86d {+18h 31m 27s}  -23.24d {-23d 14' 22"}
SUN_DIST:         47.81 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      145.21d {+09h 40m 51s}  +11.18d {+11d 10' 55"}
MOON_DIST:       169.63 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       32.44,-49.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      324.32, -7.77 [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 = 155.94,20.00 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 06:56:46 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     668689,   Seg_Num: 0
GRB_RA:          329.3703d {+21h 57m 28.87s} (J2000),
                 329.5923d {+21h 58m 22.14s} (current),
                 328.6752d {+21h 54m 42.04s} (1950)
GRB_DEC:         -20.7326d {-20d 43' 57.3"} (J2000),
                 -20.6559d {-20d 39' 21.2"} (current),
                 -20.9713d {-20d 58' 16.6"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24784.00 SOD {06:53:04.00} UT,   156.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       277.86d {+18h 31m 27s}  -23.24d {-23d 14' 22"}
SUN_DIST:         47.80 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      145.24d {+09h 40m 57s}  +11.18d {+11d 10' 33"}
MOON_DIST:       169.64 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       32.43,-49.93 [deg] galactic lon,lat of the burst
ECL_COORDS:      324.31, -7.77 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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:        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:     Tue 29 Dec 15 07:00:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.414d {+21h 57m 39s} (J2000)
POINT_DEC:       -20.722d {-20d 43' 19"} (J2000)
POINT_ROLL:      256.932d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24718.22 SOD {06:51:58.22} UT,   90.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.141
N_STARS:         13
X_OFFSET:        691 [pixels]
Y_OFFSET:        430 [pixels]
X_MAX:           1650 [pixels]
Y_MAX:           1389 [pixels]
DET_THRESH:      25
PHOTO_THRESH:    15
SL_URL:          sw00668689000msufc0090.fits
SUN_POSTN:       277.87d {+18h 31m 28s}  -23.24d {-23d 14' 22"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.27d {+09h 41m 04s}  +11.17d {+11d 10' 04"}
MOON_DIST:       169.64 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.46,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 07:00:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.414d {+21h 57m 39s} (J2000)
POINT_DEC:       -20.722d {-20d 43' 19"} (J2000)
POINT_ROLL:      256.932d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24718.22 SOD {06:51:58.22} UT,   90.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.141
N_STARS:         13
X_OFFSET:        691 [pixels]
Y_OFFSET:        430 [pixels]
X_MAX:           1650 [pixels]
Y_MAX:           1389 [pixels]
DET_THRESH:      25
PHOTO_THRESH:    15
SL_URL:          sw00668689000msufc0090.fits
SUN_POSTN:       277.87d {+18h 31m 28s}  -23.24d {-23d 14' 22"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.27d {+09h 41m 05s}  +11.17d {+11d 10' 01"}
MOON_DIST:       169.64 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.46,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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:     Tue 29 Dec 15 07:02:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.414d {+21h 57m 39s} (J2000)
POINT_DEC:       -20.722d {-20d 43' 19"} (J2000)
ROLL:            256.932d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24718.22 SOD {06:51:58.22} UT,   90.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     473064733
X_OFFSET:        1010 [pixels]
Y_OFFSET:        749 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1170
Y_GRB_POS:       909
BINNING_INDEX:   1
IM_URL:          sw00668689000msuni0106.fits
SUN_POSTN:       277.87d {+18h 31m 28s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.28d {+09h 41m 08s}  +11.16d {+11d 09' 51"}
MOON_DIST:       169.64 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.46,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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:     Tue 29 Dec 15 07:02:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.414d {+21h 57m 39s} (J2000)
POINT_DEC:       -20.722d {-20d 43' 19"} (J2000)
ROLL:            256.932d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24718.22 SOD {06:51:58.22} UT,   90.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     473064733
X_OFFSET:        1010 [pixels]
Y_OFFSET:        749 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1170
Y_GRB_POS:       909
BINNING_INDEX:   1
IM_URL:          sw00668689000msuni0106.fits
SUN_POSTN:       277.87d {+18h 31m 28s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.28d {+09h 41m 08s}  +11.16d {+11d 09' 48"}
MOON_DIST:       169.64 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.46,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 07:06:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.415d {+21h 57m 40s} (J2000)
POINT_DEC:       -20.720d {-20d 43' 11"} (J2000)
POINT_ROLL:      256.931d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24930.33 SOD {06:55:30.33} UT,   302.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.449
N_STARS:         31
X_OFFSET:        451 [pixels]
Y_OFFSET:        190 [pixels]
X_MAX:           1890 [pixels]
Y_MAX:           1629 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00668689000msufc0302.fits
SUN_POSTN:       277.87d {+18h 31m 29s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.32d {+09h 41m 17s}  +11.15d {+11d 09' 13"}
MOON_DIST:       169.65 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.47,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 15 07:07:09 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     668689,   Seg_Num: 0
GRB_RA:          329.3702d {+21h 57m 28.84s} (J2000),
                 329.5922d {+21h 58m 22.12s} (current),
                 328.6751d {+21h 54m 42.02s} (1950)
GRB_DEC:         -20.7325d {-20d 43' 57.0"} (J2000),
                 -20.6558d {-20d 39' 20.8"} (current),
                 -20.9712d {-20d 58' 16.3"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24784.00 SOD {06:53:04.00} UT,   156.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       277.87d {+18h 31m 29s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.79 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      145.33d {+09h 41m 18s}  +11.15d {+11d 09' 10"}
MOON_DIST:       169.65 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.43,-49.93 [deg] galactic lon,lat of the burst
ECL_COORDS:      324.31, -7.77 [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:     Tue 29 Dec 15 07:07:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.415d {+21h 57m 40s} (J2000)
POINT_DEC:       -20.720d {-20d 43' 11"} (J2000)
POINT_ROLL:      256.931d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24930.33 SOD {06:55:30.33} UT,   302.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.449
N_STARS:         31
X_OFFSET:        451 [pixels]
Y_OFFSET:        190 [pixels]
X_MAX:           1890 [pixels]
Y_MAX:           1629 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00668689000msufc0302.fits
SUN_POSTN:       277.87d {+18h 31m 29s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.33d {+09h 41m 18s}  +11.15d {+11d 09' 11"}
MOON_DIST:       169.65 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.47,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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:     Tue 29 Dec 15 07:08:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.415d {+21h 57m 40s} (J2000)
POINT_DEC:       -20.720d {-20d 43' 11"} (J2000)
ROLL:            256.931d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24930.33 SOD {06:55:30.33} UT,   302.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     473064945
X_OFFSET:        1010 [pixels]
Y_OFFSET:        749 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1170
Y_GRB_POS:       909
BINNING_INDEX:   1
IM_URL:          sw00668689000msuni0318.fits
SUN_POSTN:       277.87d {+18h 31m 29s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.33d {+09h 41m 20s}  +11.15d {+11d 09' 02"}
MOON_DIST:       169.65 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.47,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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:     Tue 29 Dec 15 07:08:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     668689,   Seg_Num: 0
POINT_RA:        329.415d {+21h 57m 40s} (J2000)
POINT_DEC:       -20.720d {-20d 43' 11"} (J2000)
ROLL:            256.931d
IMG_START_DATE:  17385 TJD;   363 DOY;   15/12/29
IMG_START_TIME:  24930.33 SOD {06:55:30.33} UT,   302.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     473064945
X_OFFSET:        1010 [pixels]
Y_OFFSET:        749 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1170
Y_GRB_POS:       909
BINNING_INDEX:   1
IM_URL:          sw00668689000msuni0318.fits
SUN_POSTN:       277.87d {+18h 31m 29s}  -23.24d {-23d 14' 21"}
SUN_DIST:         47.84 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      145.34d {+09h 41m 21s}  +11.15d {+11d 09' 00"}
MOON_DIST:       169.65 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:       32.47,-49.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      324.36, -7.78 [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 #18745
D. Kocevski (NASA/GSFC/ORAU), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 06:50:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151229A (trigger=668689). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 329.380, -20.729 which is
```
   RA(J2000) = 21h 57m 31s
   Dec(J2000) = -20d 43' 42"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 1.5 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 06:51:54.9 UT, 86.9 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 329.3703, -20.7325 which is equivalent to:
```
   RA(J2000)  = 21h 57m 28.87s
   Dec(J2000) = -20d 43' 56.9"
```
with an uncertainty of 2.0 arcseconds (radius, 90% containment). This location is 35 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 in excess of the Galactic value (2.71 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 7.6 (+2.59/-2.28) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 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 0.03.
Burst Advocate for this burst is D. Kocevski (dankocevski AT gmail.com). 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 #18750
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 609 s of XRT Photon Counting mode data and 1 UVOT images for GRB 151229A, 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 = 329.36981, -20.73203 which is equivalent to:
```
RA (J2000): 21h 57m 28.76s
Dec (J2000): -20d 43' 55.3"
```
with an uncertainty of 1.8 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 #18751
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. Kocevski (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 151229A (trigger #668689) (Kocevski, et al., GCN Circ. 18745). The BAT ground-calculated position is RA, Dec = 329.363, -20.732 deg, which is
```
   RA(J2000)  =  21h 57m 27.1s 
   Dec(J2000) = -20d 43' 56.2" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%.
The mask-weighted light curve shows single peak starting at ~T-0.1 sec, peaking at ~T+0.1 sec, and ending at ~T+1.7 sec. T90 (15-350 keV) is 1.78 +- 0.44 sec (estimated error including systematics).
The time-averaged spectrum from T-0.11 to T+2.34 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.84 +- 0.10. The fluence in the 15-150 keV band is 5.9 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 7.2 +- 0.4 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/668689/BA/
GCN Circular #18753
M. De Pasquale (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151229A 90 s after the BAT trigger (Kocevski et al., GCN Circ. 18745). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 18750) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            90          240          147         >20.0
u_FC               302          552          246         >19.3
white               90         5493          378         >20.5
v                  632         5904          413         >18.8
b                  558         5288          236         >19.5
u                  302         6513          653         >19.8
w1                 681         6314          413         >19.7
m2                4474         6108          393         >19.9
w2                4064         5699          393         >20.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #18756
A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 06:50:27.95 UT on 29 December 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 151229A (trigger 473064631 / 151229285 ), which was also detected by the Swift/BAT (Kocevski et al. 2015, GCN 18745) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 53.4 degrees.
The GBM light curve consists of a single peak with a duration (T90) of about 3.5 s (50-300 keV). The time-averaged spectrum from T0-0.256: s to T0+1.280 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.19 (+0.10/-0.09) and the cutoff energy, parameterized as Epeak, is 97.1 (+10.3/-8.3) keV
The event fluence (10-1000 keV) in this time interval is (9.4 +/- 0.5)E-07 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0-0.128 s in the 10-1000 keV band is 11.0 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #18757
K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester) and D. Kocevski report on behalf of the Swift-XRT team:
We have analysed 7.4 ks of XRT data for GRB 151229A (Kocevski et al. GCN Circ. 18745), from 73 s to 32.8 ks after the BAT trigger. The data comprise 67 s in Windowed Timing (WT) mode (the first 8 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. 18750).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.832 (+/-0.021).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.04 (+0.15, -0.14). The best-fitting absorption column is 7.2 (+1.1, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 2.7 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (7.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.2 (+1.1, -1.0) x 10^21 cm^-2
Galactic foreground: 2.7 x 10^20 cm^-2
Excess significance: 11.4 sigma
Photon index:	     2.04 (+0.15, -0.14)
```
If the light curve continues to decay with a power-law decay index of 0.832, the count rate at T+24 hours will be 0.023 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.8 x 10^-13 (1.8 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00668689.
This circular is an official product of the Swift-XRT team.
GCN Circular #18760
J. Norris (BSU), S. D. Barthelmy (GSFC), A. Y. Lien (GSFC/UMBC) for the Swift-BAT Team:
We report the spectral lag analysis for GRB 151229A (Kocevski, et al., GCN Circ. 18745, & Lien 18751) based on the BAT data. Using 8-ms binned light curve, the spectral lag for the 25-50 keV to 100-300 keV bands is -47.6 +/-31 ms and +12 +/-24 for the 15-25 to 50-100 bands. Although the errors are large, the values are marginally consistent with zero, therefore we believe this burst belongs to a short burst category, although we can not rule out the long burst possibility. There is no evidence for extended emission.
GCN Circular #18761
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 MITSuME and OISTER collaboration:
We observed the field of GRB 151229A (Kocevski et al., GCNC 18745) 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 2015-12-29 09:07:26 UT (~2.3h after the burst). We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 18750) 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
-----------------------------------------------------
0.11774    09:39:59    2940.0   >18.7  >18.7  >18.2
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #18765
Y.Saito, T.Fujiwara, T. Yoshii, Y. Tano, Y. Tachibana, Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 151229A (D. Kocevski et al., GCN Circular #18745) 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 started on 2015-12-29 08:56:00 UT (~2.1 h after the burst). We did not find any new point source within XRT circle in all three bands.
We obtained following limits for the magnitudes.
```
T0+[sec]    MID-UT      T-EXP[sec]           g'            Rc                Ic
-------------------------------------------------------------------------------------------------
7533       09:20:52            2700           > 19.5        > 19.4        > 18.6
-------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration.
photometric redshift z = 0.63 +0.47 -0.34
of host-galaxy: A. E. Nugent et al. 2022, ApJ, 940, 57
photometric redshift z= 1.4 +- 0.2
of host galaxy B. O'Connor et al. 2022, MN 515, 4890

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Jochen Greiner, last update: 17-Jan-2023 [Disclaimer]