Gamma-ray Burst 201216C

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:07:50 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1013243,   Seg_Num: 0
GRB_RA:           16.358d {+01h 05m 26s} (J2000),
                  16.636d {+01h 06m 33s} (current),
                  15.695d {+01h 02m 47s} (1950)
GRB_DEC:         +16.537d {+16d 32' 12"} (J2000),
                 +16.649d {+16d 38' 55"} (current),
                 +16.269d {+16d 16' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6072 [cnts]    Image_Peak=364 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       18967 [cnts]
BKG_TIME:        83237.83 SOD {23:07:17.83} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83251.72 SOD {23:07:31.72} UT
GRB_PHI:         -21.56 [deg]
GRB_THETA:        52.03 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     69.31 [sigma]
IMAGE_SIGNIF:    15.28 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +4  +0  +0 +43  +0 
SUN_POSTN:       265.06d {+17h 40m 15s}  -23.36d {-23d 21' 29"}
SUN_DIST:        115.91 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 33s}  -24.02d {-24d 01' 29"}
MOON_DIST:        86.47 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.78,-46.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       21.42,  8.84 [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 = 38.57,-19.88 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=629852850).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:07:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     629852850
GRB_RA:            7.150d {+00h 28m 36s} (J2000),
                   7.424d {+00h 29m 42s} (current),
                   6.497d {+00h 25m 59s} (1950)
GRB_DEC:         +20.417d {+20d 25' 00"} (J2000),
                 +20.532d {+20d 31' 57"} (current),
                 +20.140d {+20d 08' 25"} (1950)
GRB_ERROR:       13.15 [deg radius, statistical plus systematic]
GRB_INTEN:       255 [cnts/sec]
DATA_SIGNIF:     9.50 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         122.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.72
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       265.06d {+17h 40m 15s}  -23.36d {-23d 21' 29"}
SUN_DIST:        108.85 [deg]   Sun_angle= -6.8 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 33s}  -24.02d {-24d 01' 28"}
MOON_DIST:        80.61 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      115.71,-42.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.81, 15.88 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 29.98,6.73 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:07:59 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     629852850
GRB_RA:           17.367d {+01h 09m 28s} (J2000),
                  17.658d {+01h 10m 38s} (current),
                  16.674d {+01h 06m 42s} (1950)
GRB_DEC:         +32.683d {+32d 40' 60"} (J2000),
                 +32.795d {+32d 47' 40"} (current),
                 +32.417d {+32d 25' 02"} (1950)
GRB_ERROR:       4.03 [deg radius, statistical plus systematic]
GRB_INTEN:       1322 [cnts/sec]
DATA_SIGNIF:     82.00 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         122.98 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.67
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       265.06d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        120.75 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 33s}  -24.02d {-24d 01' 28"}
MOON_DIST:        94.45 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.31,-30.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.00, 23.30 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 29.98,6.73 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:08:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     629852850
GRB_RA:           17.367d {+01h 09m 28s} (J2000),
                  17.658d {+01h 10m 38s} (current),
                  16.674d {+01h 06m 42s} (1950)
GRB_DEC:         +32.850d {+32d 51' 00"} (J2000),
                 +32.961d {+32d 57' 41"} (current),
                 +32.584d {+32d 35' 02"} (1950)
GRB_ERROR:       3.97 [deg radius, statistical plus systematic]
GRB_INTEN:       1461 [cnts/sec]
DATA_SIGNIF:     124.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         122.98 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.72
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       265.06d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        120.77 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 34s}  -24.02d {-24d 01' 28"}
MOON_DIST:        94.52 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.30,-29.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.08, 23.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 29.98,6.73 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:08:20 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      91
TRIGGER_NUM:     629852850
GRB_RA:           17.317d {+01h 09m 16s} (J2000),
                  17.609d {+01h 10m 26s} (current),
                  16.622d {+01h 06m 29s} (1950)
GRB_DEC:         +33.683d {+33d 40' 60"} (J2000),
                 +33.795d {+33d 47' 41"} (current),
                 +33.417d {+33d 25' 01"} (1950)
GRB_ERROR:       3.70 [deg radius, statistical plus systematic]
GRB_INTEN:       2327 [cnts/sec]
DATA_SIGNIF:     203.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         122.98 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.84
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       265.06d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        120.87 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 34s}  -24.02d {-24d 01' 27"}
MOON_DIST:        94.84 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.17,-29.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.41, 24.22 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 29.98,6.73 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:08:09 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     629852850
GRB_RA:           26.870d {+01h 47m 29s} (J2000),
                  27.154d {+01h 48m 37s} (current),
                  26.194d {+01h 44m 47s} (1950)
GRB_DEC:         +15.880d {+15d 52' 48"} (J2000),
                 +15.984d {+15d 59' 02"} (current),
                 +15.631d {+15d 37' 51"} (1950)
GRB_ERROR:       4.89 [deg radius, statistical only]
DATA_SIGNIF:     25.20 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         140.00 [deg]
GRB_THETA:        88.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       265.06d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        125.31 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      298.39d {+19h 53m 34s}  -24.02d {-24d 01' 27"}
MOON_DIST:        95.34 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      142.12,-44.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       30.61,  4.48 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_629852850.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(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:09:01 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     629852850
GRB_RA:           16.840d {+01h 07m 22s} (J2000),
                  17.120d {+01h 08m 29s} (current),
                  16.174d {+01h 04m 42s} (1950)
GRB_DEC:         +18.010d {+18d 00' 36"} (J2000),
                 +18.122d {+18d 07' 18"} (current),
                 +17.743d {+17d 44' 35"} (1950)
GRB_ERROR:       3.06 [deg radius, statistical only]
DATA_SIGNIF:     39.00 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         131.00 [deg]
GRB_THETA:        92.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       265.07d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        116.80 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.40d {+19h 53m 36s}  -24.02d {-24d 01' 24"}
MOON_DIST:        87.52 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      128.26,-44.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.43, 10.03 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_629852850.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:16:46 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     629852850
GRB_RA:           17.880d {+01h 11m 31s} (J2000),
                  18.159d {+01h 12m 38s} (current),
                  17.214d {+01h 08m 51s} (1950)
GRB_DEC:         +16.800d {+16d 48' 00"} (J2000),
                 +16.911d {+16d 54' 39"} (current),
                 +16.535d {+16d 32' 04"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         133.00 [deg]
GRB_THETA:        93.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       265.07d {+17h 40m 17s}  -23.36d {-23d 21' 30"}
SUN_DIST:        117.37 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.48d {+19h 53m 56s}  -24.01d {-24d 00' 52"}
MOON_DIST:        87.81 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      129.83,-45.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.89,  8.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_locplot_all_bn201216963.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:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:09:10 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     629852850
GRB_RA:           21.460d {+01h 25m 50s} (J2000),
                  21.746d {+01h 26m 59s} (current),
                  20.778d {+01h 23m 07s} (1950)
GRB_DEC:         +22.370d {+22d 22' 12"} (J2000),
                 +22.478d {+22d 28' 43"} (current),
                 +22.110d {+22d 06' 37"} (1950)
GRB_ERROR:       2.83 [deg radius, statistical only]
DATA_SIGNIF:     123.10 [sigma]
DATA_INTERVAL:   10.240 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         132.00 [deg]
GRB_THETA:        86.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       265.07d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        122.17 [deg]   Sun_angle= -7.8 [hr] (East of Sun)
MOON_POSTN:      298.40d {+19h 53m 36s}  -24.02d {-24d 01' 23"}
MOON_DIST:        93.32 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      133.30,-39.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.22, 12.39 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_629852850.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:09:20 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      4
TRIGGER_NUM:     629852850
GRB_RA:           17.810d {+01h 11m 14s} (J2000),
                  18.093d {+01h 12m 22s} (current),
                  17.137d {+01h 08m 33s} (1950)
GRB_DEC:         +21.210d {+21d 12' 36"} (J2000),
                 +21.321d {+21d 19' 16"} (current),
                 +20.944d {+20d 56' 40"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     169.30 [sigma]
DATA_INTERVAL:   13.312 [sec]
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16
GRB_TIME:        83245.75 SOD {23:07:25.75} UT
GRB_PHI:         130.00 [deg]
GRB_THETA:        89.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       265.07d {+17h 40m 16s}  -23.36d {-23d 21' 29"}
SUN_DIST:        118.60 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      298.40d {+19h 53m 37s}  -24.02d {-24d 01' 23"}
MOON_DIST:        89.75 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      129.09,-41.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       24.55, 12.62 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_629852850.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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(6.0<100sec) coincident with the SWIFT_BAT event (trignum=1013243).

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 16 Dec 20 23:11:10 UT 
NOTICE_TYPE:     Swift-BAT GRB Lightcurve 
TRIGGER_NUM:     1013243,   Seg_Num: 0 
GRB_RA:           16.358d {+01h 05m 26s} (J2000), 
                  16.636d {+01h 06m 33s} (current), 
                  15.695d {+01h 02m 47s} (1950) 
GRB_DEC:         +16.537d {+16d 32' 12"} (J2000), 
                 +16.649d {+16d 38' 55"} (current), 
                 +16.269d {+16d 16' 09"} (1950) 
GRB_DATE:        19199 TJD;   351 DOY;   20/12/16 
GRB_TIME:        83251.72 SOD {23:07:31.72} UT 
TRIGGER_INDEX:   155 
GRB_PHI:         -21.56 [deg] 
GRB_THETA:        52.03 [deg] 
DELTA_TIME:      52.00 [sec] 
TRIGGER_DUR:     1.024 [sec]  
SOLN_STATUS:     0x3 
RATE_SIGNIF:     69.31 [sigma] 
IMAGE_SIGNIF:    15.28 [sigma] 
LC_URL:          sw01013243000msb.lc 
SUN_POSTN:       265.07d {+17h 40m 16s}  -23.36d {-23d 21' 29"} 
SUN_DIST:        115.91 [deg]   Sun_angle= -7.4 [hr] (East of Sun) 
MOON_POSTN:      298.42d {+19h 53m 42s}  -24.02d {-24d 01' 15"} 
MOON_DIST:        86.44 [deg] 
MOON_ILLUM:      7 [%] 
GAL_COORDS:      127.78,-46.20 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:       21.42,  8.84 [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 = 38.57,-19.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Dec 20 23:57:06 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1013243,   Seg_Num: 0
POINT_RA:         16.346d {+01h 05m 23s} (J2000)
POINT_DEC:       +16.541d {+16d 32' 28"} (J2000)
IMG_START_DATE:  19199 TJD;   351 DOY;   20/12/16
IMG_START_TIME:  86218.50 SOD {23:56:58.50} UT,   2966.8 [sec] since BAT Trigger Time
COUNTS:          19    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 17 Dec 20 00:01:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1013243,   Seg_Num: 0
POINT_RA:         16.346d {+01h 05m 23s} (J2000)
POINT_DEC:       +16.541d {+16d 32' 27"} (J2000)
POINT_ROLL:      251.609d
IMG_START_DATE:  19199 TJD;   351 DOY;   20/12/16
IMG_START_TIME:  86221.69 SOD {23:57:01.69} UT,   2970.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.533
N_STARS:         14
X_OFFSET:        375 [pixels]
Y_OFFSET:        529 [pixels]
X_MAX:           1334 [pixels]
Y_MAX:           1488 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01013243000msufc2969.fits
SUN_POSTN:       265.11d {+17h 40m 25s}  -23.36d {-23d 21' 34"}
SUN_DIST:        115.86 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      298.95d {+19h 55m 48s}  -23.96d {-23d 57' 48"}
MOON_DIST:        85.96 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.76,-46.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       21.41,  8.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 17 Dec 20 00:01:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1013243,   Seg_Num: 0
POINT_RA:         16.346d {+01h 05m 23s} (J2000)
POINT_DEC:       +16.541d {+16d 32' 27"} (J2000)
POINT_ROLL:      251.609d
IMG_START_DATE:  19199 TJD;   351 DOY;   20/12/16
IMG_START_TIME:  86221.69 SOD {23:57:01.69} UT,   2970.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.533
N_STARS:         14
X_OFFSET:        375 [pixels]
Y_OFFSET:        529 [pixels]
X_MAX:           1334 [pixels]
Y_MAX:           1488 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01013243000msufc2969.fits
SUN_POSTN:       265.11d {+17h 40m 25s}  -23.36d {-23d 21' 34"}
SUN_DIST:        115.86 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      298.95d {+19h 55m 49s}  -23.96d {-23d 57' 47"}
MOON_DIST:        85.95 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.76,-46.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       21.41,  8.85 [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 17 Dec 20 00:02:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1013243,   Seg_Num: 0
POINT_RA:         16.346d {+01h 05m 23s} (J2000)
POINT_DEC:       +16.541d {+16d 32' 27"} (J2000)
ROLL:            251.609d
IMG_START_DATE:  19199 TJD;   351 DOY;   20/12/16
IMG_START_TIME:  86221.69 SOD {23:57:01.69} UT,   2970.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     629855847
X_OFFSET:        694 [pixels]
Y_OFFSET:        848 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1008
BINNING_INDEX:   1
IM_URL:          sw01013243000msuni2996.fits
SUN_POSTN:       265.11d {+17h 40m 26s}  -23.36d {-23d 21' 34"}
SUN_DIST:        115.86 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      298.97d {+19h 55m 52s}  -23.96d {-23d 57' 42"}
MOON_DIST:        85.94 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.76,-46.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       21.41,  8.85 [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 17 Dec 20 00:03:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1013243,   Seg_Num: 0
POINT_RA:         16.346d {+01h 05m 23s} (J2000)
POINT_DEC:       +16.541d {+16d 32' 27"} (J2000)
ROLL:            251.609d
IMG_START_DATE:  19199 TJD;   351 DOY;   20/12/16
IMG_START_TIME:  86221.69 SOD {23:57:01.69} UT,   2970.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     629855847
X_OFFSET:        694 [pixels]
Y_OFFSET:        848 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1008
BINNING_INDEX:   1
IM_URL:          sw01013243000msuni2996.fits
SUN_POSTN:       265.11d {+17h 40m 26s}  -23.36d {-23d 21' 34"}
SUN_DIST:        115.86 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      298.97d {+19h 55m 52s}  -23.96d {-23d 57' 41"}
MOON_DIST:        85.94 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.76,-46.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       21.41,  8.85 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #29061
A. P. Beardmore (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 23:07:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201216C (trigger=1013243). Swift did not slew immediately to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 16.358, +16.537 which is
```
   RA(J2000) = 01h 05m 26s
   Dec(J2000) = +16d 32' 12"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 50 sec. The peak count rate was ~13000 counts/sec (15-350 keV), at ~20 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+46.8 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #29062
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB201216.96 (trigger No 1013243,01h 05m 25.92s , +16d 32m 13.2s, R=0.05) errorbox 39 sec after notice time and 68 sec after trigger time at 2020-12-16 23:08:40 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 79 deg. The sun altitude is -62.3 deg.
The galactic latitude b = -46 deg., longitude l = 129 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1504800
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     159 |      MASTER-Tavrida |   C |   180 | 17.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29063
The Fermi GBM team reports the detection of a likely LONG GRB
At 23:07:25 UT on 16 Dec 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201216C (trigger 629852850.753568 / 201216963).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 17.9, Dec = 16.8 (J2000 degrees, equivalent to J2000 01h 11m, 16d 48'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 93.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_skymap_all_bn201216963.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_healpix_all_bn201216963.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201216963/quicklook/glg_lc_medres34_bn201216963.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 17 Dec 20 00:16:22 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1013243,   Seg_Num: 0
GRB_RA:           16.3702d {+01h 05m 28.84s} (J2000),
                  16.6486d {+01h 06m 35.67s} (current),
                  15.7071d {+01h 02m 49.69s} (1950)
GRB_DEC:         +16.5154d {+16d 30' 55.4"} (J2000),
                 +16.6273d {+16d 37' 38.1"} (current),
                 +16.2478d {+16d 14' 52.1"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]    
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19200 TJD;   352 DOY;   20/12/17
IMG_START_TIME:  174.00 SOD {00:02:54.00} UT,   3322.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       265.12d {+17h 40m 28s}  -23.36d {-23d 21' 35"}
SUN_DIST:        115.87 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      299.11d {+19h 56m 26s}  -23.95d {-23d 56' 45"}
MOON_DIST:        85.83 [deg] 
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.80,-46.22 [deg] galactic lon,lat of the burst
ECL_COORDS:       21.43,  8.82 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 17 Dec 20 00:32:30 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1013243,   Seg_Num: 0
GRB_RA:           16.3711d {+01h 05m 29.06s} (J2000),
                  16.6495d {+01h 06m 35.88s} (current),
                  15.7080d {+01h 02m 49.91s} (1950)
GRB_DEC:         +16.5166d {+16d 30' 59.7"} (J2000),
                 +16.6285d {+16d 37' 42.5"} (current),
                 +16.2490d {+16d 14' 56.5"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90 containment]    
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19200 TJD;   352 DOY;   20/12/17
IMG_START_TIME:  174.00 SOD {00:02:54.00} UT,   3322.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       265.13d {+17h 40m 31s}  -23.36d {-23d 21' 36"}
SUN_DIST:        115.86 [deg]   Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN:      299.28d {+19h 57m 06s}  -23.93d {-23d 55' 37"}
MOON_DIST:        85.68 [deg] 
MOON_ILLUM:      7 [%]
GAL_COORDS:      127.80,-46.22 [deg] galactic lon,lat of the burst
ECL_COORDS:       21.43,  8.82 [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:        The probability that this is a serendipitous source in the
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #29064
S. Campana (INAF-OAB), G. Cusumano (INAF-IASF PA), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 201216C at 23:56:58.5 UT, 2966.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 16.37114, 16.51659 which is equivalent to:
```
   RA(J2000)  = 01h 05m 29.07s
   Dec(J2000) = +16d 30' 59.7"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 86 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (5.04 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 7.4 (+2.86/-2.53) x 10^21 cm^-2 (90% confidence).
GCN Circular #29066
L. Izzo (DARK/NBI), D. B. Malesani (DTU Space) and D. A. Kann (HETH, IAA/CSIC) report:
We observed the field of GRB 201216C (Beardmore et al., GCN #29061, Fermi GBM team, GCN #29063) using the ESO VLT UT3 (Melipal) equipped with the X-shooter acquisition camera. Observations started at 01:18:47 UT on 2020-12-17 (2.19 hr after the BAT trigger) and consisted of 3x40 s, 3x30 s, 3x60 s exposures obtained in the Sloan g', r', z' bands, respectively.
We detect a new source at coordinates RA: 01:05:28.980, Dec: +16:31:00.0 (J2000.0), consistent with the Swift-XRT refined position (Campana et al., GCN #29064). No source is detected in archival Pan-STARRS images at this position, we therefore consider it to be the afterglow of GRB 201216C. From the stacked r'-band image we report a preliminary magnitude of 21.81+-0.05 mag (AB). We acknowledge excellent support from the ESO observing staff in Paranal, in particular Zahed Wahhaj and Bin Yang.
GCN Circular #29067
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 656 s of XRT Photon Counting mode data and 3 UVOT images for GRB 201216C, 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 = 16.37032, +16.51612 which is equivalent to:
```
RA (J2000): 01h 05m 28.88s
Dec (J2000): +16d 30' 58.0"
```
with an uncertainty of 1.6 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 #29070
Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the alert of GRB201216C (Beardmore et al GCNC 29061, Fermi/GBM team GCNC 29063, Campana et al. GCNC 29064 and Osborne et al. GCNC 29067), obtaining a series of 20s unfiltered images starting at 23:08:04.3 UT, i.e. 31.6s post trigger.
We clearly detect the source reported by Izzo et al. (GCNC 29066) at the VLT. The observations by FRAM cover the onset of the afterglow and its peak. The joint fit of our final points from ~1ks post trigger and the VLT point provide a power-law decay rate of ~1.07, all of these confirm the afterglow nature of the transient and provide an extrapolation of the brightness to r~24.6 for the next night.
GCN Circular #29071
S. R. Oates (U.Birmingham) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201216C 2970 s after the BAT trigger (Beardmore et al., GCN Circ. 29061). No optical afterglow consistent with the enhanced XRT position (Osborne et al. GCN Circ. 29067) or the VLT position (Izzo et al., GCN Circ. 29066) 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          2970         3120          147         >20.0
white             2970         3739          344         >20.7
v                 3950         4150          197         >19.1
b                 3334         3534          197         >19.9
u                 3129         3329          197         >19.3
m2                4154         4331          174         >19.3
w2                3745         3945          197         >19.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #29073
C. Malacaria (NASA-MSFC/USRA), P. Veres (UAH), C. Meegan (UAH) and E. Bissaldi (Politecnico and INFN Bari) report on behalf of the Fermi GBM Team:
"At 23:07:25.75 UT on 16 December 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201216C (trigger 629852850 / 201216963), which was also detected by the Swift/BAT (Beardmore et al. 2020, GCN 29061). The Fermi GBM Final Real-time Localization (GCN 29063) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 94 degrees.
GRB 201216C is particularly bright and hard. The GBM light curve shows a broad, structured peak with a duration (T90) of about 29.9 s (50-300 keV). The time-averaged spectrum from T0-0.003 s to T0+49.665 s is best fit by a Band function with Epeak = 326 +/- 7 keV, alpha = -1.06 +/- 0.01, and beta = -2.25 +/- 0.03.
The event fluence (10-1000 keV) in this time interval is (1.41 +/- 0.06)E-4 erg/cm^2. The 1-sec peak photon flux measured starting from T0+24.8 s in the 10-1000 keV band is 54.9 +/- 0.6 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 #29074
D. Nadella (NITK), G. Waratkar (IITB), A. Vibhute (IUCAA), S. Gupta (IUCAA), P. Sawant (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (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, 2020, arxiv:2011.07067) showed detection of a bright long GRB 201216C, which was also detected by Swift BAT (GCN #29061) and Fermi GBM (GCN #29063).
The source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-12-16 23:07:47.500 UT. The measured peak count rate associated with the burst is 1160 (+72, -40) cts/s above the background in the combined data of four quadrants, with a total of 18073 (+682, -728) cts. The local mean background count rate was 652 (+4, -4) cts/s. Using cumulative rates, we measure a T90 of 29 (+2, -2) s.
It was also clearly 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 2020-12-16 23:07:47.247 UT. The measured peak count rate is 1679 (+106, -78) cts/s above the background in the combined Veto data of four quadrants, with a total of 22904 (+1443 -1654) cts. The local mean background count rate was 2400 (+7, -8) cts/s. We measure a T90 of 26 (+4, -2) s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #29075
O.Blanch (IFAE-BIST Barcelona), F. Longo (University and INFN Trieste), A. Berti (INFN Torino), S. Fukami (ICRR University of Tokyo), Y. Suda (MPP Munich), S. Loporchio (University and INFN Bari), S. Micanovic (University of Rijeka), J. G. Green (INAF Rome), V. Pinter (IFAE-BIST), M. Takahashi (ICRR University of Tokyo), on behalf of the MAGIC collaboration report:
On December 16, 2020, the MAGIC telescopes observed GRB 201216C following the trigger by Swift-BAT and Fermi-GBM (Beardmore et al., GCN 29061, Fermi/GBM team GCN 29063). MAGIC started observations under good conditions about 57 seconds after the GRB onset. The preliminary offline analyses show an excess above 5 sigma, compatible with the GRB position reported by the Swift and Fermi teams. Refined off-line analyses of the data are ongoing.
We strongly encourage follow-up observations by other instruments at all wavelengths.
The MAGIC point of contact for this burst is O. Blanch (blanch@ifae.es). Burst Advocate for this burst is F. Longo (francesco.longo@ts.infn.it).
MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Observatory Roque de los Muchachos on the Canary island La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.
GCN Circular #29076
E. Bissaldi (Politecnico and INFN Bari), N. Omodei (Stanford University), D. Kocevski (UAH), M. Axelsson (KTH & Stockholm Univ.), F. Longo (University and INFN Trieste), and E. Moretti (IFAE-BIST Barcelona) report on behalf of the Fermi-LAT Collaboration:
Fermi-LAT observed the position of GRB 201216C, which was detected by Fermi-GBM (GCN Circ. 29073), Swift (GCN Circ. 29061, 29064), and MAGIC (GCN Circ. 29075). The GRB position was not in the LAT field of view at the time of the GBM trigger (T0 = 2019-12-16, 23:07:25.75 UT), and was not visible until ~T0+3500 s. The position remained visible until ~T0+5500 s.
No significant high-energy gamma-ray emission associated with this burst was detected by the LAT in this time interval.
A LAT upper limit (95% confidence level, 100 MeV - 1 GeV), assuming a photon index of -2.0, covering the same time interval is 7.3E-7 ph/s/cm2. The corresponding upper limit for energy flux is 3E-10 erg/s/cm2.
The Fermi-LAT point of contact for this burst is Elena Moretti (moretti@ifae.es).
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 #29077
J.-B. Vielfaure (APC, Paris University), L. Izzo (DARK/NBI), D. Xu (NAOC), S. D. Vergani (GEPI, Observatoire de Paris), D. B. Malesani (DTU Space), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), V. D'Elia (ASI/SSDC, INAF/OAR), J. P. U. Fynbo (DAWN/NBI), D. A. Kann (HETH/IAA-CSIC), A. J. Levan (Radboud U. Nijmegen), G. Pugliese (API, Univ. Amsterdam), N. R. Tanvir (Univ. Leicester), D. Burgarella (AMU, CNRS, CNES, LAM), and A. Rossi (INAF-OAS) report on behalf of the Stargate Consortium:
We obtained spectroscopic observations of the optical counterpart (Izzo et al., GCN #29066, Jelinek et al., GCN #29070) of the MAGIC-detected (Blanch et al., GCN #29075) GRB 201216C (Beardmore et al., GCN #29061, Malacaria et al., GCN #29073, Nadella et al., GCN #29074) with the ESO Very Large Telescope UT 3 (Melipal) equipped with the X-shooter spectrograph, covering the wavelength range 3200-22000 AA. Observations started at 01:30 UT on 2020-12-17, 2.38 hr after the burst, and consisted of 4 exposures of 600 s each.
The afterglow is well-detected in the stacked spectrum, but the continuum is very red. As a consequence, the S/N drops dramatically from the red to the blue end. We identify a doublet which we tentatively match to Ca II H & K at z = 1.10. Unfortunately, no other lines are detected to confirm this value, though most of them would fall in a spectral region of poor S/N. We note that Ca II H&K absorption is uncommon in intervening absorbers, making it likely this is the actual redshift of the GRB, and that it does not lie at an even greater distance (in accordance with the VHE detection).
A redshift of z = 1.1 would place this object among the most distant known VHE sources. Using the Fermi GBM parameters (Malacaria et al., GCN #29073), we derive a an observer-frame 10-1000 keV isotropic energy release of E_iso = (4.71 +/- 0.16) * 10^53 erg.
Based on our grz photometry (Izzo et al., GCN 29066), we measure a spectral slope beta_opt = 4.1 +- 0.2 (Fnu propto nu^-beta), which is an unusually red value, suggesting significant extinction. This is confirmed by the optical-to-X-ray spectral index, beta_OX ~ 0.1 which indicates a very low optical/X-ray flux ratio, making this a bona fide dark GRB.
We acknowledge excellent support from the ESO observing staff in Paranal, in particular, Diego Parraguez, Bin Yang, and Zahed Wahhaj.
GCN Circular #29080
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201216C (trigger #1013243) (Beardmore et al., GCN Circ. 29061). The BAT ground-calculated position is RA, Dec = 16.364, 16.538 deg which is
```
   RA(J2000)  =  01h 05m 27.4s
   Dec(J2000) = +16d 32' 16.4"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~ T-16 s and ends at ~T+64 s. The main peak occurs at ~T+20 s. T90 (15-350 keV) is 48.0 +- 16.0 sec (estimated error including systematics).
The time-averaged spectrum from T-15.89 to T+64.11 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.43 +- 0.03. The fluence in the 15-150 keV band is 4.5 +- 0.1 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+23.61 sec in the 15-150 keV band is 18.0 +- 1.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1013243/BA/
GCN Circular #29084
D. Frederiks, S. Golenetskii, R.Aptekar, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 201216C (Swift detection: Beardmore et al., GCN 29061; Fermi GBM detection: Malacaria et al., GCN 29071; AstroSat CZTI detection: Nadella et al., GCN 29074; MAGIC detection: Blanch et al., GCN 29075) triggered Konus-Wind (KW) at T0=83248.844 s UT (23:07:28.844).
The burst light curve shows a multi-peaked structure with the total duration of ~40 s. The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB201216_T83248/
As observed by Konus-Wind, the burst had a fluence of (1.86 � 0.10)x10^-4 erg/cm^2 and a 64-ms peak energy flux, measured from T0+24.704, of (1.82 � 0.12)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+24.832 s) is best fit in the 20 keV - 20 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.09 (-0.05,+0.06), the high energy photon index beta = -2.32 (-0.13,+0.10), the peak energy Ep = 333 (-28,+29) keV, chi2 = 102/97 dof.
The spectrum near the peak count rate (measured from T0+18.944 to T0+26.368 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.99 (-0.05,+0.06), the high energy photon index beta = -2.24 (-0.14,+0.10), the peak energy Ep = 326 (-41,+47) keV, chi2 = 121/97 dof.
Assuming the redshift z=1.1 (Vielfaure et al., GCN 29077) and a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso = (6.2 � 0.6)x10^53 erg, the peak luminosity L_iso = (1.3 � 0.1)x10^53 erg/s, and the rest-frame peak energy of the time-integrated spectrum Ep,z=(700 � 61) keV. With these values, GRB 201216C is within 68% prediction bands for both 'Amati' and 'Yonetoku' relations built for the sample of long KW GRBs with known redshifts (part I: Tsvetkova et al., ApJ 850 161, 2017; part II: Tsvetkova et al., ApJ, submitted), see http://www.ioffe.ru/LEA/GRBs/GRB201216_T83248/GRB201216C.pdf
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
GCN Circular #29085
M. Shrestha (Liverpool JMU), A. Melandri (INAF), R. Smith (LJMU) , I.A. Steele (LJMU), S. Kobayashi (LJMU), C. Mundell (Univ. Bath), A. Gomboc (Univ. Nova Gorica), C. Guidorzi (Univ. Ferrara) report on behalf of a wider collaboration:
We observed the field of Swift GRB 201216C (GCN 29061) with the 2.0m Liverpool Telescope (LT), La Palma on 2020 Dec 16 starting at 23:10:29.13 UT using the IO:O optical camera in the r� bands. Data was calibrated with respect to nearby APASS secondary standard stars.
We confirm the optical counterpart reported by Swift UVOT and VLT (GCN 29066).
At T=177 seconds after the BAT trigger time, we measure r� = 18.38. The r� band light curve made along with VLT (GCN 29066) data point and inferred data from FRAM-ORM (GCN 29070) show a power law decay in flux vs time with alpha = 1. From the light curve, LT observations seem to be around the peak of afterglow.
GCN Circular #29086
On 2020/12/16 at 23:07:31 UTC, following the trigger by Swift-BAT and Fermi-GBM (GCN 29061, GCN 29063), HAWC observed the position of GRB 201216C.
The position of the GRB at the time of trigger (t0) fell just inside the field of view of HAWC, at 40 deg from zenith. We observed the position in the time range [t0-100s,t0+3600s]. At the end of the analysis, the position was at 25 deg from zenith. We scanned this range with time bins of 100s width. The time window advances every 20s, producing 80% overlap between different time windows.
No emission was observed. The most conservative flux upper-limit at 95% C.L. measured during the time range is
dN/dE = 4.05e-10 (E/TeV)^-2.0 [TeV^-1 cm^-2 s^-1]
HAWC is a very-high-energy gamma-ray observatory operating in Central Mexico at latitude 19 deg. north. Operating day and night with over 95% duty cycle, HAWC has an instantaneous field of view of 2 sr and surveys 2/3 of the sky every day. It is sensitive to gamma rays from 300 GeV to 100 TeV.
GCN Circular #29210
S. Belkin (IKI), A. Pozanenko (IKI), M. Krugov (FAI), P. Levkina (INASAN), E. Klunko (ISTP), N. Pankov (IKI, HSE) report on behalf of GRB IKI FuN:
We observed GRB 201216C (Beardmore et al., GCN 29061) with Zeiss-1000 (West) telescope of TSHAO, Zeiss-2000 telescope of Terskol observatory, and AZT-33IK telescope of Mondy observatory. The optical afterglow (Izzo et al., GCN 29066; Jelinek et al., GCN 29070; Oates et al., GCN 29071; Shrestha et al., GCN 29085) at possible redshift of z = 1.1 of presumably optically dark GRB (Vielfaure et al., GCN 29077) is not detected in our observations. Preliminary photometry of the field is following.
```
Date       UT start  t-T0     Filter Exp.  OT   Err. UL.  Telescope
                      (mid, days)      (s)

2020-12-17 14:20:49  0.6968    R  60*180   n/d  n/d  19.8 Zeiss-1000(W)
2020-12-18 16:47:27  1.7653    R  28*180   n/d  n/d  21.9 Zeiss-2000
2020-12-19 12:00:27  2.5681    R  45*120   n/d  n/d  22.1 AZT-22
```
Photometry is based on USNO-B1.0 stars
```
USNO-B1.0_id R2
1065-0011134 15.33
1065-0011173 15.44
1064-0011283 16.67
```
GCN Circular #29278
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU) and A.P. Beardmore report on behalf of the Swift-XRT team:
We have analysed 2.8 ks of XRT data for GRB 201216C (Beardmore et al. GCN Circ. 29061), from 3.0 ks to 1896.5 ks after the BAT trigger. The data comprise 466 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 29067).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.97 (+0.10, -0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.35 (+0.17, -0.16). The best-fitting absorption column is 7.7 (+1.2, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 5.0 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.03 (+0.16, -0.15) and a best-fitting absorption column of 5.6 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (8.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.6 (+1.0, -0.9) x 10^21 cm^-2
Galactic foreground: 5.0 x 10^20 cm^-2
Excess significance: 9.3 sigma
Photon index:	     2.03 (+0.16, -0.15)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01013243.
This circular is an official product of the Swift-XRT team.
GCN Circular #29280
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
The XRT refined analysis of GRB 201216C contained in GCN Circ. 29278 was incorrect, some of the data had been excluded from the analysis. The corrected analysis is below.
We apologise for the confusion.
We have analysed 5.2 ks of XRT data for GRB 201216C (Beardmore et al. GCN Circ. 29061), from 3.0 ks to 1938.0 ks after the BAT trigger. The data comprise 466 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 29067).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.09 (+0.16, -0.10), followed by a break at T+9078 s to an alpha of 1.07 (+0.15, -0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.35 (+0.17, -0.16). The best-fitting absorption column is 7.7 (+1.2, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 5.0 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.03 (+0.16, -0.15) and a best-fitting absorption column of 5.6 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (8.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:        5.6 (+1.0, -0.9) x 10^21 cm^-2
Galactic foreground: 5.0 x 10^20 cm^-2
Excess significance: 9.3 sigma
Photon index:        2.03 (+0.16, -0.15)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01013243.
GCN Circular #29674
P. Gokuldass (UVI), D. Morris (UVI), N. Orange (OrangeWave Innovative Science, LLC), R. Strausbaugh (UVI), A. Cucchiara (UVI/College of Marin) report:
We observed the field of GRB201216C (V. Lipunov et al., GCN 29062) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 12-16-2020 starting at 23:43:20.5 UT (T+36 mins).
We performed a series of exposures in R filter with a total exposure of 2060 s. The weather conditions were very clear during the hours of observation with an average arimass of 1.0.
We find no new source within the enhanced XRT position error circle (S. Campana et al., 29064) and report the following 3-sigma upper limit:
```
T_mid       ||Exposure     ||Filter      ||Limit
T+ 1 hr      ||2060s           ||R            ||>20.65
```
The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase.
This work is supported by NASA-MUREP-MIRO grant NNX15AP95A, NSF EiR AST Award 1901296, and NSF HBCU-UP AST Award 1831682. This message can be cited.

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