Gamma-ray Burst 221216A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:21:34 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1144698,   Seg_Num: 0
GRB_RA:          326.021d {+21h 44m 05s} (J2000),
                 326.364d {+21h 45m 27s} (current),
                 325.272d {+21h 41m 05s} (1950)
GRB_DEC:         -34.405d {-34d 24' 17"} (J2000),
                 -34.299d {-34d 17' 55"} (current),
                 -34.635d {-34d 38' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2091 [cnts]    Image_Peak=169 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       10787 [cnts]
BKG_TIME:        40865.59 SOD {11:21:05.59} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19929 TJD;   350 DOY;   22/12/16
GRB_TIME:        40880.95 SOD {11:21:20.95} UT
GRB_PHI:         -18.24 [deg]
GRB_THETA:        15.71 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     17.83 [sigma]
IMAGE_SIGNIF:    9.84 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +0 -57  +0 
SUN_POSTN:       263.98d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         54.92 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.42d {+11h 49m 42s}   +5.21d {+05d 12' 25"}
MOON_DIST:       139.10 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      316.56,-19.57 [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 = 142.50,-19.84 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(2.0<100sec) coincident with the FER
MI_GBM event (trignum=692882483).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:21:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     692882483
GRB_RA:          270.133d {+18h 00m 32s} (J2000),
                 270.700d {+18h 02m 48s} (current),
                 268.899d {+17h 55m 36s} (1950)
GRB_DEC:         -64.867d {-64d 52' 00"} (J2000),
                 -64.866d {-64d 51' 56"} (current),
                 -64.864d {-64d 51' 51"} (1950)
GRB_ERROR:       16.97 [deg radius, statistical plus systematic]
GRB_INTEN:       124 [cnts/sec]
DATA_SIGNIF:     6.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19929 TJD;   350 DOY;   22/12/16
GRB_TIME:        40878.18 SOD {11:21:18.18} UT
GRB_PHI:          44.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       263.98d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         41.78 [deg]   Sun_angle= -0.4 [hr] (East of Sun)
MOON_POSTN:      177.43d {+11h 49m 42s}   +5.21d {+05d 12' 22"}
MOON_DIST:        96.10 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:      328.96,-19.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      270.08,-41.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_lc_medres34_bn221216473.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 145.97,15.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=1144698).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:21:56 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     692882483
GRB_RA:          300.767d {+20h 03m 04s} (J2000),
                 301.083d {+20h 04m 20s} (current),
                 300.076d {+20h 00m 18s} (1950)
GRB_DEC:         -11.683d {-11d 40' 59"} (J2000),
                 -11.618d {-11d 37' 02"} (current),
                 -11.824d {-11d 49' 26"} (1950)
GRB_ERROR:       19.08 [deg radius, statistical plus systematic]
GRB_INTEN:       102 [cnts/sec]
DATA_SIGNIF:     10.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19929 TJD;   350 DOY;   22/12/16
GRB_TIME:        40878.18 SOD {11:21:18.18} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.71
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   3%  Cyg X-1
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       263.98d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         37.14 [deg]   Sun_angle= -2.5 [hr] (East of Sun)
MOON_POSTN:      177.43d {+11h 49m 43s}   +5.21d {+05d 12' 20"}
MOON_DIST:       123.98 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       30.29,-21.12 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      300.44,  8.56 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_lc_medres34_bn221216473.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 145.97,15.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=1144698).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:22:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     692882483
GRB_RA:          316.810d {+21h 07m 14s} (J2000),
                 317.138d {+21h 08m 33s} (current),
                 316.095d {+21h 04m 23s} (1950)
GRB_DEC:         -21.230d {-21d 13' 47"} (J2000),
                 -21.137d {-21d 08' 11"} (current),
                 -21.432d {-21d 25' 53"} (1950)
GRB_ERROR:       9.47 [deg radius, statistical only]
DATA_SIGNIF:     13.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19929 TJD;   350 DOY;   22/12/16
GRB_TIME:        40878.18 SOD {11:21:18.18} UT
GRB_PHI:          43.00 [deg]
GRB_THETA:        92.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       263.98d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         48.98 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      177.43d {+11h 49m 43s}   +5.21d {+05d 12' 18"}
MOON_DIST:       137.84 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       26.67,-38.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      312.98, -4.50 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_lc_medres34_bn221216473.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_692882483.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 ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=1144698).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:22:56 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1144698,   Seg_Num: 0
GRB_RA:          326.0326d {+21h 44m 07.82s} (J2000),
                 326.3754d {+21h 45m 30.08s} (current),
                 325.2840d {+21h 41m 08.15s} (1950)
GRB_DEC:         -34.4223d {-34d 25' 20.2"} (J2000),
                 -34.3161d {-34d 18' 57.9"} (current),
                 -34.6522d {-34d 39' 07.8"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.95e-09 [erg/cm2/sec]
GRB_SIGNIF:      13.07 [sigma]
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40952.69 SOD {11:22:32.69} UT,   71.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.15 261.76 243.61
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       263.98d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         54.92 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.43d {+11h 49m 44s}   +5.20d {+05d 12' 06"}
MOON_DIST:       139.09 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.71,-49.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      316.57,-19.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.18 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:23:06 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
GRB_RA:          326.0326d {+21h 44m 07.8s} (J2000),
                 326.3754d {+21h 45m 30.0s} (current),
                 325.2840d {+21h 41m 08.1s} (1950)
GRB_DEC:         -34.4223d {-34d 25' 20.2"} (J2000),
                 -34.3161d {-34d 18' 57.9"} (current),
                 -34.6522d {-34d 39' 07.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       171 [cnts]
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40952.69 SOD {11:22:32.69} UT,   71.7 [sec] since BAT Trigger Time
CENTROID_X:      317.24,  raw= 317  [pixels]
CENTROID_Y:      324.73,  raw= 325  [pixels]
ROLL:            264.11 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   62.78
GRB_POS_XRT_Z:   23.21
IMAGE_URL:       sw01144698000msxps_rw.img
SUN_POSTN:       263.99d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         54.92 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.44d {+11h 49m 45s}   +5.20d {+05d 12' 04"}
MOON_DIST:       139.09 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.71,-49.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      316.57,-19.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:23:08 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
GRB_RA:          326.0326d {+21h 44m 07.8s} (J2000),
                 326.3754d {+21h 45m 30.0s} (current),
                 325.2840d {+21h 41m 08.1s} (1950)
GRB_DEC:         -34.4223d {-34d 25' 20.2"} (J2000),
                 -34.3161d {-34d 18' 57.9"} (current),
                 -34.6522d {-34d 39' 07.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       171 [cnts]
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40952.69 SOD {11:22:32.69} UT,   71.7 [sec] since BAT Trigger Time
CENTROID_X:      317.24,  raw= 317  [pixels]
CENTROID_Y:      324.73,  raw= 325  [pixels]
ROLL:            264.11 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   62.78
GRB_POS_XRT_Z:   23.21
IMAGE_URL:       sw01144698000msxps_rw.img
SUN_POSTN:       263.99d {+17h 35m 56s}  -23.32d {-23d 19' 12"}
SUN_DIST:         54.92 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.44d {+11h 49m 45s}   +5.20d {+05d 12' 03"}
MOON_DIST:       139.09 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.71,-49.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      316.57,-19.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:25:04 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1144698,   Seg_Num: 0
GRB_RA:          326.021d {+21h 44m 05s} (J2000),
                 326.364d {+21h 45m 27s} (current),
                 325.272d {+21h 41m 05s} (1950)
GRB_DEC:         -34.405d {-34d 24' 17"} (J2000),
                 -34.299d {-34d 17' 55"} (current),
                 -34.635d {-34d 38' 04"} (1950)
GRB_DATE:        19929 TJD;   350 DOY;   22/12/16
GRB_TIME:        40880.95 SOD {11:21:20.95} UT
TRIGGER_INDEX:   146
GRB_PHI:         -18.24 [deg]
GRB_THETA:        15.71 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.83 [sigma]
IMAGE_SIGNIF:    9.84 [sigma]
LC_URL:          sw01144698000msb.lc
SUN_POSTN:       263.99d {+17h 35m 57s}  -23.32d {-23d 19' 13"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.45d {+11h 49m 48s}   +5.19d {+05d 11' 36"}
MOON_DIST:       139.07 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      316.56,-19.57 [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 = 142.50,-19.84 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:25:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
POINT_ROLL:      264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40962.66 SOD {11:22:42.66} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.479
N_STARS:         28
X_OFFSET:        488 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw01144698000msufc0081.fits
SUN_POSTN:       263.99d {+17h 35m 57s}  -23.32d {-23d 19' 13"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.46d {+11h 49m 50s}   +5.19d {+05d 11' 24"}
MOON_DIST:       139.07 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:26:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
POINT_ROLL:      264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40962.66 SOD {11:22:42.66} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.479
N_STARS:         28
X_OFFSET:        488 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw01144698000msufc0081.fits
SUN_POSTN:       263.99d {+17h 35m 57s}  -23.32d {-23d 19' 13"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.46d {+11h 49m 50s}   +5.19d {+05d 11' 21"}
MOON_DIST:       139.07 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [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:     Fri 16 Dec 22 11:28:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
ROLL:            264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40962.66 SOD {11:22:42.66} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     692882593
X_OFFSET:        699 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       859
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw01144698000msuni0112.fits
SUN_POSTN:       263.99d {+17h 35m 57s}  -23.32d {-23d 19' 13"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.48d {+11h 49m 55s}   +5.18d {+05d 10' 42"}
MOON_DIST:       139.05 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [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 Circular #33067
S. Dichiara (PSU), R. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 11:21:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 221216A (trigger=1144698). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 326.021, -34.405 which is
```
   RA(J2000) = 21h 44m 05s
   Dec(J2000) = -34d 24' 17"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 200 sec. The peak count rate was ~1640 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 11:22:32.6 UT, 71.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 326.0326, -34.4223 which is equivalent to:
```
   RA(J2000)  = 21h 44m 7.82s
   Dec(J2000) = -34d 25' 20.3"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 81 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 0.042.
Burst Advocate for this burst is S. Dichiara (simonedichiara55 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/)
GCN Circular #33066
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:21:18 UT on 16 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221216A (trigger 692882483.183742 / 221216473).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 276.3, Dec = -58.1 (J2000 degrees, equivalent to J2000 18h 25m, -58d 06'), with a statistical uncertainty of 5.7 degrees.
The angle from the Fermi LAT boresight is 139.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_skymap_all_bn221216473.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_healpix_all_bn221216473.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221216473/quicklook/glg_lc_medres34_bn221216473.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:34:08 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
ROLL:            264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  41175.48 SOD {11:26:15.48} UT,   294.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     692882805
X_OFFSET:        699 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       859
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw01144698000msuni0325.fits
SUN_POSTN:       263.99d {+17h 35m 58s}  -23.32d {-23d 19' 14"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.52d {+11h 50m 05s}   +5.16d {+05d 09' 28"}
MOON_DIST:       139.00 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st Image Notice.  
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:     Fri 16 Dec 22 11:33:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
POINT_ROLL:      264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  41175.48 SOD {11:26:15.48} UT,   294.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.161
N_STARS:         14
X_OFFSET:        379 [pixels]
Y_OFFSET:        473 [pixels]
X_MAX:           1338 [pixels]
Y_MAX:           1432 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw01144698000msufc0294.fits
SUN_POSTN:       263.99d {+17h 35m 58s}  -23.32d {-23d 19' 14"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.51d {+11h 50m 03s}   +5.16d {+05d 09' 44"}
MOON_DIST:       139.01 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st SrcList Notice.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:34:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
ROLL:            264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  41175.48 SOD {11:26:15.48} UT,   294.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     692882805
X_OFFSET:        699 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       859
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw01144698000msuni0325.fits
SUN_POSTN:       263.99d {+17h 35m 59s}  -23.32d {-23d 19' 14"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.52d {+11h 50m 06s}   +5.16d {+05d 09' 24"}
MOON_DIST:       139.00 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 16 Dec 22 11:29:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
ROLL:            264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  40962.66 SOD {11:22:42.66} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     692882593
X_OFFSET:        699 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       859
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw01144698000msuni0112.fits
SUN_POSTN:       263.99d {+17h 35m 58s}  -23.32d {-23d 19' 13"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.48d {+11h 49m 56s}   +5.18d {+05d 10' 40"}
MOON_DIST:       139.04 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [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:     Fri 16 Dec 22 11:33:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1144698,   Seg_Num: 0
POINT_RA:        326.023d {+21h 44m 05s} (J2000)
POINT_DEC:       -34.405d {-34d 24' 18"} (J2000)
POINT_ROLL:      264.115d
IMG_START_DATE:  19929 TJD;   350 DOY;   22/12/16
IMG_START_TIME:  41175.48 SOD {11:26:15.48} UT,   294.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.161
N_STARS:         14
X_OFFSET:        379 [pixels]
Y_OFFSET:        473 [pixels]
X_MAX:           1338 [pixels]
Y_MAX:           1432 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw01144698000msufc0294.fits
SUN_POSTN:       263.99d {+17h 35m 58s}  -23.32d {-23d 19' 14"}
SUN_DIST:         54.91 [deg]   Sun_angle= -4.2 [hr] (East of Sun)
MOON_POSTN:      177.51d {+11h 50m 03s}   +5.16d {+05d 09' 41"}
MOON_DIST:       139.01 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       10.74,-49.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.56,-19.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN Circular #33068
T.H. Lu, X. Liu (NAOC), Z.P. Zhu (NAOC, HUST), S.Q. Jiang, S.Y. Fu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 221216A detected by Swift (Dichiara et al., GCN 33067) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained a series of frames in the Sloan r-band and z-band, starting at 11:23:09 UT on 2022-12-16, i.e., 109s after the BAT trigger.
No optical source is detected in our stacked images at the XRT position (Dichiara et al., GCN 33067), with upper limits as follows:
```
T_mid-T0 (min)    Filter   Upper limit(3-sigma)
     14.26                 r          >17.5
     14.90                 z          >16.5
```
calibrated with the nearby SkyMapper field and not corrected for Galactic extinction.
GCN Circular #33069
B. Gendre, H. Crisp, E. Moore, F. Panther, D. Coward, J. A. Moore (OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP), and P. Thierry (AGORA), report:
We imaged the field of GRB 221216A detected by SWIFT (trigger 1144698) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 1.39h after the GRB trigger. The elevation of the field decreased from 35 degrees above horizon and weather conditions were good.
On individual images taken between t0+4994.4s and t0+7433.4s, we do not detect any OT with a limiting magnitude of: R > 17.5
On a co-added series of exposures between t0+4993s to t0+6613s, we estimated a limiting magnitude of R > 19.0
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon= 10.7381 lat=-49.4597 and the galactic extinction in R band is 0.1 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #33070
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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. Gres, N.M. Budnev (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),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 221216A ( S. Dichiara et al., GCN 33067) errorbox 11435 sec after notice time and 11456 sec after trigger time at 2022-12-16 14:32:17 UT, with upper limit up to 15.4 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -9.8 deg.
The galactic latitude b = -50 deg., longitude l = 11 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2184841
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   11546 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #33071
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1446 s of XRT Photon Counting mode data and 4 UVOT images for GRB 221216A, 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 = 326.03022, -34.42125 which is equivalent to:
```
RA (J2000): 21h 44m 7.25s
Dec (J2000): -34d 25' 16.5"
```
with an uncertainty of 2.3 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 #33073
Mohammad Odeh of Al-Khatim Observatory (AKO) operated by the International Astronomical Center, in Abu Dhabi, UAE.
We observed the field of GRB 221216A detected by FERMI (GCN 33066) and Swift (Dichiara et al., GCN 33067) with our 0.35m f/7.7 robotic telescope. The observation was done on 16 December 2022 from 15:17:47 to 15:32:55 (UT), 4.1 hours after the GRB trigger. We obtained multiple 180-sec exposures in Ic filter. We did not detect any afterglow within XRT localization (Evans et al., GCN 33071). This is consistent with the reported non-detections of (Lu et al., GCN 33068) and (Gendre et al., GCN 33069).
The following upper limit was calculated using Atlas catalogue as a reference:
---------------------------------------------------------------------------- -
JD (mid), T_mid-T0(hrs), Exposure (sec), Filter, Lim_mag
---------------------------------------------------------------------------- -
2459930.142604, 4.1, 5 x 180 (stacked), Ic, > 17.3
---------------------------------------------------------------------------- -
These magnitudes are not corrected for galactic extinction.
GCN Circular #33076
E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and S. Dichiara report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 221216A (Dichiara et al. GCN Circ. 33067), from 61 s to 38.7 ks after the BAT trigger. The data comprise 249 s in Windowed Timing (WT) mode (the first 10 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 Evans et al. (GCN Circ. 33071).
The late-time light curve (from T0+4.6 ks) can be modelled with an initial power-law decay with an index of alpha=0.30 (+0.16, -0.17), followed by a break at T+12.4 ks to an alpha of 2.2 (+0.4, -0.3).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.58 (+/-0.03). The best-fitting absorption column is 1.49 (+0.13, -0.12) x 10^21 cm^-2, in excess of the Galactic value of 2.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.75 (+0.12, -0.11) and a best-fitting absorption column of 5.1 (+2.9, -2.3) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.1 (+2.9, -2.3) x 10^20 cm^-2
Galactic foreground: 2.8 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.75 (+0.12, -0.11)
```
If the light curve continues to decay with a power-law decay index of 2.2, the count rate at T+24 hours will be 6.3 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.3 x 10^-13 (2.5 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/01144698.
This circular is an official product of the Swift-XRT team.
GCN Circular #33077
R. Dunwoody (UCD), J. Mangan (UCD) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 11:21:18.18 UT on 16 December 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221216A (trigger 692882483 / 221216473) which was also detected by the Swift/BAT (Dichiara et al. 2022, GCN 33067) The Fermi GBM Final Real-time Localization (GCN 33066) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 101 degrees.
The GBM light curve shows multiple peaks with a duration (T90) of about 184 s (50-300 keV). The time-averaged spectrum from T0-15 s to T0+173 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.58 +/- 0.18 and the cutoff energy, parameterized as Epeak, is 94.6 +/- 8.4 keV. It is fit equally well with a Band function with Epeak = 82.4 +/- 12.1 keV, alpha = -0.4 +/- 0.3, and beta = -2.5 +/- 0.3.
The event fluence (10-1000 keV) in this time interval is (6.31 +/- 0.40)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3 s in the 10-1000 keV band is 3.7 +/- 0.3 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 #33078
Paul Kuin (MSSL/UCL) and Simone Dichiara(PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 221116A 113 s after the BAT trigger (Dichiara et al., GCN Circ. 33067). No optical afterglow consistent with the enhanced XRT position 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              113          263          147         >20.3
white             4797         4997          197         >20.4
u                  325          358           32         >18.3
b                 4592         6041          197         >19.7
uvw1              5618         5818          197         >19.4
uvm2              5413         5613          197         >19.4
uvw2              5003         5203          197         >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.042 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #33088
J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory),� N. Werner (Masaryk U.), M. Ohno (Hiroshima U.),� L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, M. Dafcikova, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory),� T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.
The long-duration GRB 221216A (Fermi/GBM detection: Dunwoody et al., GCN Circ. 33077; Dichiara et al., GCN Circ. 33067; GECAM-B trigger num. 105) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by GRB detector unit no. 1 and the count rate curve shows the peak time at 2022-12-16 11:21:28 UTC. The T90 duration was measured to be 90 s with the light curve resolution of 1 s. The significance during T90 reaches 9.5 sigma.
The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB221216A_GCN_VZLUSAT2.pdf
GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSats constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.
GCN Circular #33254
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), S. Dichiara (PSU), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 221216A (trigger #1144698) (Dichiara, et al., GCN Circ. 33067). The BAT ground-calculated position is RA, Dec = 326.023, -34.394 deg which is
```
   RA(J2000)  =  21h 44m 05.6s
   Dec(J2000) = -34d 23' 37.4"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows two broad peaks, one centered around T+0, and the other at T+165 seconds. There is a third, more narrow and weaker peak at T+50 seconds and some possible subsidiary peaks. Note that not all of the event data is available, so it is possible that the burst extended before or after this period. T90 (15-350 keV) is 174.48 +- 5.26 sec (estimated error including systematics).
The time-averaged spectrum from -9.68 to T+175.22 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.02 +- 0.36, and Epeak of 91.0 +- 44.0 keV (chi squared 37.14 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.6 +- 0.3 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.23 sec in the 15-150 keV band is 1.8 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.56 +- 0.08 (chi squared 44.55 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/1144698/BA/

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Jochen Greiner, last update: 02-Feb-2023 [Disclaimer]