Gamma-ray Burst 231214A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:24:44 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1202386,   Seg_Num: 0
GRB_RA:          305.736d {+20h 22m 57s} (J2000),
                 306.383d {+20h 25m 32s} (current),
                 304.372d {+20h 17m 29s} (1950)
GRB_DEC:         -72.436d {-72d 26' 09"} (J2000),
                 -72.358d {-72d 21' 26"} (current),
                 -72.596d {-72d 35' 45"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8949 [cnts]    Image_Peak=521 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       54606 [cnts]
BKG_TIME:        73455.45 SOD {20:24:15.45} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73468.31 SOD {20:24:28.31} UT
GRB_PHI:         -124.58 [deg]
GRB_THETA:        34.79 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     27.96 [sigma]
IMAGE_SIGNIF:    16.02 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +4  +0  +0 -57  +0 
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         54.93 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.15d {+19h 16m 36s}  -27.34d {-27d 20' 06"}
MOON_DIST:        45.99 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      322.21,-32.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      286.27,-51.01 [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 = 341.04,-16.61 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=724278269).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:24:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     724278269
GRB_RA:          334.583d {+22h 18m 20s} (J2000),
                 335.039d {+22h 20m 09s} (current),
                 333.621d {+22h 14m 29s} (1950)
GRB_DEC:         -69.183d {-69d 10' 59"} (J2000),
                 -69.063d {-69d 03' 44"} (current),
                 -69.434d {-69d 26' 01"} (1950)
GRB_ERROR:       7.07 [deg radius, statistical plus systematic]
GRB_INTEN:       386 [cnts/sec]
DATA_SIGNIF:     12.50 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         285.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.56
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         62.37 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      289.15d {+19h 16m 36s}  -27.34d {-27d 20' 06"}
MOON_DIST:        49.47 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      320.28,-42.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      302.10,-52.84 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 197.05,-2.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:25:03 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     724278269
GRB_RA:          305.883d {+20h 23m 32s} (J2000),
                 306.573d {+20h 26m 18s} (current),
                 304.426d {+20h 17m 42s} (1950)
GRB_DEC:         -74.350d {-74d 20' 59"} (J2000),
                 -74.271d {-74d 16' 15"} (current),
                 -74.510d {-74d 30' 36"} (1950)
GRB_ERROR:       5.65 [deg radius, statistical plus systematic]
GRB_INTEN:       525 [cnts/sec]
DATA_SIGNIF:     32.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         288.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.79
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         56.16 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.15d {+19h 16m 36s}  -27.34d {-27d 20' 05"}
MOON_DIST:        47.80 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      319.99,-32.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.16,-52.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 197.05,-2.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:25:13 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     724278269
GRB_RA:          306.583d {+20h 26m 20s} (J2000),
                 307.257d {+20h 29m 02s} (current),
                 305.161d {+20h 20m 39s} (1950)
GRB_DEC:         -73.817d {-73d 49' 00"} (J2000),
                 -73.737d {-73d 44' 11"} (current),
                 -73.980d {-73d 58' 47"} (1950)
GRB_ERROR:       4.15 [deg radius, statistical plus systematic]
GRB_INTEN:       1148 [cnts/sec]
DATA_SIGNIF:     48.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         288.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.77
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         55.98 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.15d {+19h 16m 37s}  -27.33d {-27d 20' 04"}
MOON_DIST:        47.37 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      320.55,-32.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.79,-52.38 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 197.05,-2.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:25:13 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     724278269
GRB_RA:          305.830d {+20h 23m 19s} (J2000),
                 306.521d {+20h 26m 05s} (current),
                 304.369d {+20h 17m 29s} (1950)
GRB_DEC:         -74.400d {-74d 24' 00"} (J2000),
                 -74.321d {-74d 19' 16"} (current),
                 -74.560d {-74d 33' 35"} (1950)
GRB_ERROR:       3.10 [deg radius, statistical only]
DATA_SIGNIF:     35.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         288.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         56.18 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.15d {+19h 16m 37s}  -27.33d {-27d 20' 04"}
MOON_DIST:        47.84 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      319.94,-32.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.11,-52.84 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_724278269.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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 ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:25:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      74
TRIGGER_NUM:     724278269
GRB_RA:          306.733d {+20h 26m 56s} (J2000),
                 307.403d {+20h 29m 37s} (current),
                 305.318d {+20h 21m 16s} (1950)
GRB_DEC:         -73.717d {-73d 43' 00"} (J2000),
                 -73.636d {-73d 38' 10"} (current),
                 -73.880d {-73d 52' 49"} (1950)
GRB_ERROR:       4.27 [deg radius, statistical plus systematic]
GRB_INTEN:       1016 [cnts/sec]
DATA_SIGNIF:     85.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         288.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.76
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       261.92d {+17h 27m 41s}  -23.23d {-23d 13' 38"}
SUN_DIST:         55.95 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.16d {+19h 16m 37s}  -27.33d {-27d 20' 04"}
MOON_DIST:        47.29 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      320.65,-32.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.92,-52.31 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 197.05,-2.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:33:33 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     724278269
GRB_RA:          302.230d {+20h 08m 55s} (J2000),
                 302.885d {+20h 11m 32s} (current),
                 300.851d {+20h 03m 24s} (1950)
GRB_DEC:         -72.120d {-72d 07' 11"} (J2000),
                 -72.048d {-72d 02' 53"} (current),
                 -72.266d {-72d 15' 55"} (1950)
GRB_ERROR:       1.01 [deg radius, statistical only]
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73464.68 SOD {20:24:24.68} UT
GRB_PHI:         291.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       261.93d {+17h 27m 43s}  -23.23d {-23d 13' 40"}
SUN_DIST:         53.91 [deg]   Sun_angle= -2.7 [hr] (East of Sun)
MOON_POSTN:      289.25d {+19h 16m 59s}  -27.32d {-27d 19' 29"}
MOON_DIST:        45.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.82,-31.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      284.87,-50.34 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_locplot_all_bn231214850.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1202386).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:26:21 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.817d {+20h 23m 16s} (J2000)
POINT_DEC:       -72.478d {-72d 28' 40"} (J2000)
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73574.56 SOD {20:26:14.56} UT,   106.2 [sec] since BAT Trigger Time
COUNTS:          13    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:     Thu 14 Dec 23 20:27:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1202386,   Seg_Num: 0
GRB_RA:          305.736d {+20h 22m 57s} (J2000),
                 306.383d {+20h 25m 32s} (current),
                 304.372d {+20h 17m 29s} (1950)
GRB_DEC:         -72.436d {-72d 26' 09"} (J2000),
                 -72.358d {-72d 21' 26"} (current),
                 -72.596d {-72d 35' 45"} (1950)
GRB_DATE:        20292 TJD;   348 DOY;   23/12/14
GRB_TIME:        73468.31 SOD {20:24:28.31} UT
TRIGGER_INDEX:   148
GRB_PHI:         -124.58 [deg]
GRB_THETA:        34.79 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     27.96 [sigma]
IMAGE_SIGNIF:    16.02 [sigma]
LC_URL:          sw01202386000msb.lc
SUN_POSTN:       261.92d {+17h 27m 42s}  -23.23d {-23d 13' 39"}
SUN_DIST:         54.93 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.18d {+19h 16m 44s}  -27.33d {-27d 19' 53"}
MOON_DIST:        45.99 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.21,-32.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      286.27,-51.01 [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 = 341.04,-16.61 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:32:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.823d {+20h 23m 17s} (J2000)
POINT_DEC:       -72.478d {-72d 28' 39"} (J2000)
POINT_ROLL:      308.800d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73910.62 SOD {20:31:50.62} UT,   442.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.645
N_STARS:         43
X_OFFSET:        826 [pixels]
Y_OFFSET:        495 [pixels]
X_MAX:           1785 [pixels]
Y_MAX:           1454 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01202386000msufc0442.fits
SUN_POSTN:       261.93d {+17h 27m 42s}  -23.23d {-23d 13' 40"}
SUN_DIST:         54.97 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.24d {+19h 16m 57s}  -27.33d {-27d 19' 31"}
MOON_DIST:        46.04 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.15,-32.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.28,-51.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:33:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.823d {+20h 23m 17s} (J2000)
POINT_DEC:       -72.478d {-72d 28' 39"} (J2000)
POINT_ROLL:      308.800d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73910.62 SOD {20:31:50.62} UT,   442.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.645
N_STARS:         43
X_OFFSET:        826 [pixels]
Y_OFFSET:        495 [pixels]
X_MAX:           1785 [pixels]
Y_MAX:           1454 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01202386000msufc0442.fits
SUN_POSTN:       261.93d {+17h 27m 43s}  -23.23d {-23d 13' 40"}
SUN_DIST:         54.97 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.24d {+19h 16m 58s}  -27.33d {-27d 19' 30"}
MOON_DIST:        46.04 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.15,-32.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.28,-51.06 [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:     Thu 14 Dec 23 20:34:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.823d {+20h 23m 17s} (J2000)
POINT_DEC:       -72.478d {-72d 28' 39"} (J2000)
ROLL:            308.800d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73910.62 SOD {20:31:50.62} UT,   442.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     724278743
X_OFFSET:        1145 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1305
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw01202386000msuni0475.fits
SUN_POSTN:       261.93d {+17h 27m 43s}  -23.23d {-23d 13' 40"}
SUN_DIST:         54.97 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.25d {+19h 17m 00s}  -27.32d {-27d 19' 26"}
MOON_DIST:        46.04 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.15,-32.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.28,-51.06 [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:     Thu 14 Dec 23 20:34:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.823d {+20h 23m 17s} (J2000)
POINT_DEC:       -72.478d {-72d 28' 39"} (J2000)
ROLL:            308.800d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73910.62 SOD {20:31:50.62} UT,   442.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     724278743
X_OFFSET:        1145 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1305
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw01202386000msuni0475.fits
SUN_POSTN:       261.93d {+17h 27m 43s}  -23.23d {-23d 13' 40"}
SUN_DIST:         54.97 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.25d {+19h 17m 01s}  -27.32d {-27d 19' 26"}
MOON_DIST:        46.04 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.15,-32.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.28,-51.06 [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 #35334
The Fermi GBM team reports the detection of a likely LONG GRB
At 20:24:24 UT on 14 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231214A (trigger 724278269.684604 / 231214850).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 302.2, Dec = -72.1 (J2000 degrees, equivalent to J2000 20h 08m, -72d 05'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 50.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_skymap_all_bn231214850.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_healpix_all_bn231214850.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 20:34:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1202386,   Seg_Num: 0
GRB_RA:          305.6857d {+20h 22m 44.56s} (J2000),
                 306.3325d {+20h 25m 19.79s} (current),
                 304.3214d {+20h 17m 17.13s} (1950)
GRB_DEC:         -72.4325d {-72d 25' 57.0"} (J2000),
                 -72.3541d {-72d 21' 14.7"} (current),
                 -72.5922d {-72d 35' 31.9"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  73875.00 SOD {20:31:15.00} UT,   406.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       261.93d {+17h 27m 43s}  -23.23d {-23d 13' 40"}
SUN_DIST:         54.91 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.26d {+19h 17m 02s}  -27.32d {-27d 19' 24"}
MOON_DIST:        45.98 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.22,-32.61 [deg] galactic lon,lat of the burst
ECL_COORDS:      286.25,-51.00 [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:        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 Circular #35335
R. Brivio (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU), M. Ferro (INAF-OAB), M. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), C. Salvaggio (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 20:24:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231214A (trigger=1202386). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 305.736, -72.436 which is
```
   RA(J2000) = 20h 22m 57s
   Dec(J2000) = -72d 26' 09"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 30 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~13 sec after the trigger.
The XRT began observing the field at 20:26:14.5 UT, 106.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 305.68573, -72.43256 which is equivalent to:
```
   RA(J2000)  = 20h 22m 44.58s
   Dec(J2000) = -72d 25' 57.2"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 56 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 https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
UVOT took a finding chart exposure of 39 seconds with the White filter starting 442 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 0.060.
Burst Advocate for this burst is R. Brivio (riccardo.brivio AT inaf.it). 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/)
GCN Circular #35336
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB231214.85 (trigger No 1202386,20h 22m 56.64s , -72d 26m 09.6s, R=0.05) errorbox 81 sec after notice time and 103 sec after trigger time at 2023-12-14 20:26:11 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -27.0 deg.
The galactic latitude b = -33 deg., longitude l = 322 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2332686
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     108 |         MASTER-SAAO | P\\ |    10 | 16.9 |        
     133 |         MASTER-SAAO | P\\ |    60 | 18.3 |  Coadd 
     108 |         MASTER-SAAO |  P/ |    10 | 16.8 |        
     133 |         MASTER-SAAO |  P/ |    60 | 18.0 |  Coadd 
     131 |         MASTER-SAAO | P\\ |    20 | 17.6 |        
     131 |         MASTER-SAAO |  P/ |    20 | 17.4 |        
     176 |         MASTER-SAAO | P\\ |    30 | 18.0 |        
     176 |         MASTER-SAAO |  P/ |    30 | 17.8 |        
     219 |         MASTER-SAAO | P\\ |    40 | 18.2 |        
     219 |         MASTER-SAAO |  P/ |    40 | 17.9 |        
     274 |         MASTER-SAAO |  P/ |   150 | 18.5 |  Coadd 
     271 |         MASTER-SAAO | P\\ |    50 | 18.2 |        
     271 |         MASTER-SAAO |  P/ |    50 | 18.1 |        
     346 |         MASTER-SAAO | P\\ |    60 | 17.5 |        
     346 |         MASTER-SAAO |  P/ |    60 | 17.5 |        
     425 |         MASTER-SAAO | P\\ |    60 | 17.3 |        
     425 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
     516 |         MASTER-SAAO | P\\ |    60 | 17.3 |        
     516 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
     596 |         MASTER-SAAO | P\\ |    60 | 17.3 |        
     596 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
     686 |         MASTER-SAAO | P\\ |    60 | 17.4 |        
     686 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 21:35:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.929d {+20h 23m 43s} (J2000)
POINT_DEC:       -72.426d {-72d 25' 34"} (J2000)
POINT_ROLL:      308.771d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  77431.00 SOD {21:30:31.00} UT,   3962.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.698
N_STARS:         39
X_OFFSET:        564 [pixels]
Y_OFFSET:        134 [pixels]
X_MAX:           1523 [pixels]
Y_MAX:           1093 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01202386000msufc3962.fits
SUN_POSTN:       261.97d {+17h 27m 54s}  -23.23d {-23d 13' 48"}
SUN_DIST:         54.95 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.93d {+19h 19m 42s}  -27.25d {-27d 14' 58"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.20,-32.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.36,-51.02 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #35339
Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland) and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:
Following the detection of GRB 231214A by Swift (Brivio et al. GCNC 35335) and Fermi (Fermi GBM team GCNC 35334), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) automatically observed the GRB location starting on Dec. 14, 20:42 UT (~ 18 min after trigger). No new optical source is detected on the co-added images (11 x 10 s, clear-filter) within the Swift/XRT error region down to 19.1 mag, which is consistent with both reports from UVOT (Brivio et al. GCNC 35335) and MASTER (Lipunov et al. GCNC 35336).
We thank the staff at Boyden Observatory for their excellent support.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 14 Dec 23 21:35:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.929d {+20h 23m 43s} (J2000)
POINT_DEC:       -72.426d {-72d 25' 34"} (J2000)
POINT_ROLL:      308.771d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  77431.00 SOD {21:30:31.00} UT,   3962.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.698
N_STARS:         39
X_OFFSET:        564 [pixels]
Y_OFFSET:        134 [pixels]
X_MAX:           1523 [pixels]
Y_MAX:           1093 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01202386000msufc3962.fits
SUN_POSTN:       261.97d {+17h 27m 54s}  -23.23d {-23d 13' 48"}
SUN_DIST:         54.95 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.93d {+19h 19m 43s}  -27.25d {-27d 14' 57"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.20,-32.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.36,-51.02 [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:     Thu 14 Dec 23 21:37:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.929d {+20h 23m 43s} (J2000)
POINT_DEC:       -72.426d {-72d 25' 34"} (J2000)
ROLL:            308.771d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  77431.00 SOD {21:30:31.00} UT,   3962.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     724282263
X_OFFSET:        883 [pixels]
Y_OFFSET:        453 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       613
BINNING_INDEX:   1
IM_URL:          sw01202386000msuni3995.fits
SUN_POSTN:       261.98d {+17h 27m 54s}  -23.23d {-23d 13' 49"}
SUN_DIST:         54.95 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.95d {+19h 19m 48s}  -27.25d {-27d 14' 48"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.20,-32.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.36,-51.02 [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:     Thu 14 Dec 23 21:37:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1202386,   Seg_Num: 0
POINT_RA:        305.929d {+20h 23m 43s} (J2000)
POINT_DEC:       -72.426d {-72d 25' 34"} (J2000)
ROLL:            308.771d
IMG_START_DATE:  20292 TJD;   348 DOY;   23/12/14
IMG_START_TIME:  77431.00 SOD {21:30:31.00} UT,   3962.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     724282263
X_OFFSET:        883 [pixels]
Y_OFFSET:        453 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1043
Y_GRB_POS:       613
BINNING_INDEX:   1
IM_URL:          sw01202386000msuni3995.fits
SUN_POSTN:       261.98d {+17h 27m 54s}  -23.23d {-23d 13' 49"}
SUN_DIST:         54.95 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      289.95d {+19h 19m 49s}  -27.25d {-27d 14' 47"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      322.20,-32.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.36,-51.02 [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 #35341
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 842 s of XRT Photon Counting mode data and 4 UVOT images for GRB 231214A, 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 = 305.68530, -72.43283 which is equivalent to:
```
RA (J2000): 20h 22m 44.47s
Dec (J2000): -72d 25' 58.2"
```
with an uncertainty of 2.2 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 #35342
D. Kocevski (NASA/MSFC), N. Di Lalla (Stanford University), M. Arimoto (Kanazawa University), and T. Khalil (Johannesburg University) report on behalf of the Fermi-LAT Collaboration:
On December 14, 2023 Fermi-LAT detected high-energy emission from GRB 231214A, which was also detected by Fermi-GBM (trigger 724278269.684604 / 231214850, GCN 35334), Swift-BAT and Swift-XRT (GCN 35335, 35341).
The best LAT on-ground location is found to be RA, Dec = 306.1, -72.4 (degrees, J2000) with an error radius of 0.2 deg (90% containment, statistical error only). This was 51 deg from the LAT boresight at the time of the GBM trigger: T0 = 20:24:24.69 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-3000 s after the GBM trigger is (3.9 +/- 0.8)E-6 ph/cm2/s. The estimated photon index above 100 MeV is -1.9 +/- 0.2. The highest-energy photon is a 2.9 GeV event which is observed 414 seconds after the GBM trigger. The Fermi-LAT point of contact for this burst is Tamador Khalil (tamtam2030@gmail.com)
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #35348
P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 231214A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 35334), Swift-BAT (Brivio et al., GCN Circ. 35335), and Fermi-LAT (Kocevski et al., GCN Circ. 35342).
The source was clearly detected in three of four quadrants of CZT detectors in the 20-200 keV energy range. AstroSat was approaching the South Atlantic Anomaly (SAA) region and hence the background rates were higher. The light curve showed multiple peaks of emission with the strongest peak at 2023-12-14 20:24:41.50 UTC. We limit our analysis to a single quadrant with a relatively stable background. The measured peak count rate associated with the burst is 99 (+28, -12) counts/s above the background in the data of one quadrant (out of four), with a total of 691 (+127, -135) counts. The local mean background count rate was 99 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 20 (+1, -1) s.
The source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-12-14 20:24:29.95 UTC. The measured peak count rate associated with the burst is 245 (+84, -30) counts/s above the background in the combined data of all quadrants, with a total of 2761 (+591, -655) counts. The local mean background count rate was 1761 (+8, -9) counts/s. We measure a T90 of 22 (+3, -2) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb
GCN Circular #35350
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 231214A, from 407 s to 45.5 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.48 (+/-0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.4 (+/-0.4). The best-fitting absorption column is 1.2 (+0.4, -0.3) x 10^22 cm^-2, in excess of the Galactic value of 5.5 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 4.2 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.2 (+0.4, -0.3) x 10^22 cm^-2
Galactic foreground: 5.5 x 10^20 cm^-2
Excess significance: 5.4 sigma
Photon index:	     2.4 (+/-0.4)
```
If the light curve continues to decay with a power-law decay index of 1.48, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x 10^-14 (1.9 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/01202386.
This circular is an official product of the Swift-XRT team.
GCN Circular #35355
M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:
We observed the field of GRB 231214A (Brivio et al., GCN 35335) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 15 at 00:39:27 UT (i.e. about 4.25 hours after the Swift trigger) and lasted for about 1 hour. From preliminary analysis, we do not find any source at the enhanced XRT position (Evans et al., GCN 35341), down the the following 3 sigma upper limits:
r > 20.1 (AB; calibrated against the SkyMapper catalogue) at a mid time of t-t0 ~ 4.92 h after the GRB trigger;
H > 17.7 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 4.68 h after the GRB trigger.
GCN Circular #35360
S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 20:24:24.68 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 231214A (trigger 724278269 / 231214850), which was also detected by the Swift/BAT (Brivio et al. 2023, GCN 35335), Fermi-LAT (Kocevski et al. 2023, GCN 35342) and AstroSat CZTI (Navaneeth et al. GCN 35348). The Fermi GBM Final Real-time Localization (GCN 35334) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 50.0 degrees.
The GBM light curve consists of two distinct peaks with a duration (T90) of about 21 s (50-300 keV). The time-averaged spectrum from T0-0.5 s to T0+26.1 s is best fit by a Band function with Epeak = 142.5 +/- 5 keV, alpha = -0.46 +/- 0.05, and beta = -2.5 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (2.25 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+16.12 s in the 10-1000 keV band is 22.24 +/- 1.77 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #35374
A. A. Breeveld (UCL-MSSL) and Brivio (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 231214A (Fermi GBM Team, GCN Circ. 35334; Kocevski et al., GCN Circ. 35342; Navaneeth et al., GCN Circ. 35348), 442 s after the BAT trigger (Brivio et al., GCN Circ. 35335). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 35341) 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 initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white              442         4733          382         >20.7
v                  4944          4998           54         >18.1
b                  4329         4528          197         >19.6
u                  4123         4322          197         >19.3
w2                4739         4939          197         >19.5
```
The magnitudes in the table are not corrected for the Galactic extinction d= ue to the reddening of E(B-V) =3D 0.060 in the direction of the burst (Schl= egel et al. 1998).
GCN Circular #35385
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), R. Brivio (INAF-OAB), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team): Using the data set from T-35 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231214A (trigger #1202386) (Brivio, et al., GCN Circ. 35335). The BAT ground-calculated position is RA, Dec = 305.666, -72.432 deg which is
```
   RA(J2000)  =  20h 22m 39.7s
   Dec(J2000) = -72d 25' 54.3"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 39%. The mask-weighted light curve shows two bright overlapping peaks. The first peak starts from T-5 s, peaks at T+1 s and ends at T+10 s. The second peak starts from T+10 s, peaks at T+12 s and ends at T+25 s. T90 (15-350 keV) is 27.8 +- 7.3 sec (estimated error including systematics). The time-averaged spectrum from T-5.37 to T+49.42 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.87 +- 0.23, and Epeak of 167 +- 94 keV (chi squared 60.53 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 9.6 +- 0.3 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+12.57 sec in the 15-150 keV band is 11.3 +- 0.6 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.25 +- 0.05 (chi squared 69.34 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/1202386/BA/
GCN Circular #35515
A. Gulati (USyd), G. E. Anderson (Curtin), J. K. Leung (UofT/HUJI), S. D. Ryder (Macquarie), A. J. van der Horst (GWU), S. Chastain (UNM), and L. Rhodes (Oxford) on behalf of the ATCA PanRadio GRB collaboration
We observed long GRB 231214A (Fermi GBM Collaboration, GCN 35334; R. Brivio et al., GCN 35335) as part of the The Australia Telescope Compact Array (ATCA) "PanRadio GRB" Large Project C3542 (PI: G. Anderson) at 5.5, 9, 16.7, 21.2, 33 and 35 GHz on 2023-12-16 and at 5.5 and 9 GHz on 2023-12-21 UT.
No radio sources were detected near the Swift/XRT enhanced position (J. P. Osborne et al., GCN 35350)in either observation epoch. The 3-sigma upper limits for the 9 GHz observations are 73 and 81 uJy respectively.
We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.

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Jochen Greiner, last update: 09-Jan-2024 [Disclaimer]