Gamma-ray Burst 200219C

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:57:54 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      60
TRIGGER_NUM:     603849435
GRB_RA:          260.340d {+17h 21m 22s} (J2000),
                 260.587d {+17h 22m 21s} (current),
                 259.727d {+17h 18m 55s} (1950)
GRB_DEC:          +5.790d {+05d 47' 24"} (J2000),
                  +5.771d {+05d 46' 17"} (current),
                  +5.838d {+05d 50' 17"} (1950)
GRB_ERROR:       2.89 [deg radius, statistical only]
DATA_SIGNIF:     82.00 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          73.00 [deg]
GRB_THETA:        39.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       332.86d {+22h 11m 25s}  -11.19d {-11d 11' 13"}
SUN_DIST:         73.87 [deg]   Sun_angle= 4.8 [hr] (West of Sun)
MOON_POSTN:      291.42d {+19h 25m 41s}  -23.13d {-23d 07' 46"}
MOON_DIST:        41.74 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       27.71, 22.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      259.01, 28.86 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_603849435.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:57:35 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      50
TRIGGER_NUM:     603849435
GRB_RA:          263.283d {+17h 33m 08s} (J2000),
                 263.520d {+17h 34m 05s} (current),
                 262.697d {+17h 30m 47s} (1950)
GRB_DEC:         +11.000d {+11d 00' 00"} (J2000),
                 +10.987d {+10d 59' 14"} (current),
                 +11.034d {+11d 02' 02"} (1950)
GRB_ERROR:       5.73 [deg radius, statistical plus systematic]
GRB_INTEN:       489 [cnts/sec]
DATA_SIGNIF:     22.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       332.85d {+22h 11m 25s}  -11.19d {-11d 11' 13"}
SUN_DIST:         72.37 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      291.42d {+19h 25m 40s}  -23.13d {-23d 07' 46"}
MOON_DIST:        43.70 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       34.16, 22.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      262.02, 34.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 78.03,17.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:57:46 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      61
TRIGGER_NUM:     603849435
GRB_RA:          262.533d {+17h 30m 08s} (J2000),
                 262.780d {+17h 31m 07s} (current),
                 261.922d {+17h 27m 41s} (1950)
GRB_DEC:          +5.950d {+05d 57' 00"} (J2000),
                  +5.936d {+05d 56' 08"} (current),
                  +5.988d {+05d 59' 16"} (1950)
GRB_ERROR:       4.22 [deg radius, statistical plus systematic]
GRB_INTEN:       1072 [cnts/sec]
DATA_SIGNIF:     101.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          70.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       332.85d {+22h 11m 25s}  -11.19d {-11d 11' 13"}
SUN_DIST:         71.79 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
MOON_POSTN:      291.42d {+19h 25m 40s}  -23.13d {-23d 07' 46"}
MOON_DIST:        40.34 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       28.93, 20.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      261.49, 29.17 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 78.03,17.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:58:37 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     603849435
GRB_RA:          264.400d {+17h 37m 36s} (J2000),
                 264.642d {+17h 38m 34s} (current),
                 263.800d {+17h 35m 12s} (1950)
GRB_DEC:          +8.340d {+08d 20' 24"} (J2000),
                  +8.329d {+08d 19' 45"} (current),
                  +8.369d {+08d 22' 07"} (1950)
GRB_ERROR:       1.18 [deg radius, statistical only]
DATA_SIGNIF:     106.20 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          69.00 [deg]
GRB_THETA:        43.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       332.86d {+22h 11m 25s}  -11.19d {-11d 11' 12"}
SUN_DIST:         70.60 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      291.43d {+19h 25m 42s}  -23.13d {-23d 07' 45"}
MOON_DIST:        40.94 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       32.09, 20.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      263.49, 31.65 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_603849435.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:58:23 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     603849435
GRB_RA:          260.170d {+17h 20m 41s} (J2000),
                 260.410d {+17h 21m 39s} (current),
                 259.573d {+17h 18m 18s} (1950)
GRB_DEC:          +9.010d {+09d 00' 36"} (J2000),
                  +8.991d {+08d 59' 28"} (current),
                  +9.059d {+09d 03' 32"} (1950)
GRB_ERROR:       1.90 [deg radius, statistical only]
DATA_SIGNIF:     22.20 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        42.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       332.86d {+22h 11m 25s}  -11.19d {-11d 11' 13"}
SUN_DIST:         74.82 [deg]   Sun_angle= 4.8 [hr] (West of Sun)
MOON_POSTN:      291.42d {+19h 25m 42s}  -23.13d {-23d 07' 45"}
MOON_DIST:        44.19 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       30.77, 24.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      258.52, 32.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_603849435.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Feb 20 23:59:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      4
TRIGGER_NUM:     603849435
GRB_RA:          265.040d {+17h 40m 10s} (J2000),
                 265.280d {+17h 41m 07s} (current),
                 264.445d {+17h 37m 47s} (1950)
GRB_DEC:          +9.360d {+09d 21' 36"} (J2000),
                  +9.351d {+09d 21' 02"} (current),
                  +9.386d {+09d 23' 08"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     76.50 [sigma]
DATA_INTERVAL:   18.432 [sec]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          69.00 [deg]
GRB_THETA:        44.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       332.86d {+22h 11m 25s}  -11.19d {-11d 11' 12"}
SUN_DIST:         70.26 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      291.43d {+19h 25m 43s}  -23.13d {-23d 07' 44"}
MOON_DIST:        41.35 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       33.36, 20.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      264.18, 32.70 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_603849435.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 20 Feb 20 00:06:27 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     603849435
GRB_RA:          264.480d {+17h 37m 55s} (J2000),
                 264.722d {+17h 38m 53s} (current),
                 263.880d {+17h 35m 31s} (1950)
GRB_DEC:          +8.390d {+08d 23' 24"} (J2000),
                  +8.379d {+08d 22' 46"} (current),
                  +8.418d {+08d 25' 06"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.33 SOD {23:57:10.33} UT
GRB_PHI:          69.00 [deg]
GRB_THETA:        43.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       332.86d {+22h 11m 27s}  -11.19d {-11d 11' 05"}
SUN_DIST:         70.54 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      291.50d {+19h 26m 00s}  -23.13d {-23d 07' 31"}
MOON_DIST:        40.97 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:       32.18, 20.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      263.58, 31.71 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_lc_medres34_bn200219998.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200219998/quicklook/glg_locplot_all_bn200219998.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the CALET_GBM event (trignum=1266191565).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 20 Feb 20 04:59:02 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     200219998 
GRB_RA:          262.690d {+17h 30m 46s} (J2000),
                 262.927d {+17h 31m 43s} (current),
                 262.100d {+17h 28m 24s} (1950)
GRB_DEC:         +10.420d {+10d 25' 12"} (J2000),
                 +10.406d {+10d 24' 21"} (current),
                 +10.457d {+10d 27' 24"} (1950)
GRB_ERROR:       15.60 [arcmin radius, 90% containment, statistical only]
GRB_DATE:        18898 TJD;    50 DOY;   20/02/19
GRB_TIME:        86230.00 SOD {23:57:10.00} UT
TRIGGER_ID:      0x20000000
MISC:            0x40000000
SUN_POSTN:       333.06d {+22h 12m 13s}  -11.11d {-11d 06' 44"}
SUN_DIST:         72.95 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
MOON_POSTN:      294.26d {+19h 37m 03s}  -22.96d {-22d 57' 22"}  
MOON_DIST:        45.32 [deg] 
MOON_ILLUM:      11 [%] 
GAL_COORDS:       33.33, 22.60 [deg] galactic lon,lat of the burst (or transient)   
ECL_COORDS:      261.35, 33.64 [deg] ecliptic lon,lat of the burst (or transient)  
COMMENTS:        Fermi LAT Offline position.
COMMENTS:        This Notice was ground-generated -- not flight-generated.
COMMENTS:        It is the result of human-in-the-loop processing.
COMMENTS:        This is a human generated position of a LAT ground detection.
COMMENTS:        This source corresponds to GBM trigger.

GCN Circular #27151
F. Dirirsa (Univ. of Johannesburg), M. Arimoto (Kanazawa Univ.), M. Axelsson (KTH & Stockholm Univ.), F. Longo (University & INFN Trieste), and N. Omodei (Stanford U.) report on behalf of the Fermi-LAT Collaboration:
On February 19, 2020, Fermi-LAT detected high-energy emission from GRB 200219C, which was also detected by Fermi-GBM (trigger 603849435/200219998, GCN 27145).
The best LAT on-ground location is found to be
RA, Dec = 262.7, 10.5 (degrees, J2000)
with an error radius of 0.24 deg (90% containment, statistical error only). This was 43 deg from the LAT boresight at the time of the GBM trigger:
T0 = 23:57:10.3 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission (2.7 degrees from the GBM position) with high significance. The photon flux above 100 MeV in the time interval 0-1500 s after the GBM trigger is 2.2 +/- 0.8 e-6 ph/cm2/s.
The estimated photon index above 100 MeV is -2.1 +/- 0.3.
The highest-energy photon is a 1.17 GeV event which is observed 344.6 seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Feraol Fana Dirirsa (fdirirsa@uj.ac.za).
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 #27152
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the Fermi/LAT GRB 200219C. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00088
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the Fermi/LAT event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #27155
R. Hamburg (UAH), C. Meegan (UAH) and E. Bissaldi (Politecnico and INFN Bari) report on behalf of the Fermi GBM Team:
"At 23:57:10.33 UT on 19 February 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200219C (trigger 603849435 / 200219998), which was also detected by Fermi-LAT (Dirirsa et al. 2020, GCN 27151). The Fermi GBM Final Real-time Localization (GCN 27145) is consistent with the LAT position.
The GBM light curve shows a bright main peak followed by a weaker emission episode and has a duration (T90) of about 22 s (50-300 keV). The time-averaged spectrum from T0-0.00 s to T0+25.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 199 +/- 9 keV. A Band function fits the spectrum equally well with Epeak = 181 +/- 12 keV, alpha = -1.05 +/- 0.03 and beta = -2.50 +/- 0.24.
The event fluence (10-1000 keV) in this time interval is (1.87 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.7 s in the 10-1000 keV band is 24.8 +/- 0.4 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 #27156
Alan M. Watson (UNAM), Eleonora Troja (GSFC/UMD), Nat Butler (ASU), William H. Lee (UNAM), Simone Dichiara (GSFC/UMD), Alexander Kutyrev (GSFC/UMD), Margarita Pereyra (UNAM), Rosa L. Becerra (UNAM), Diego Gonzalez (UNAM), and Tanner Wolfram (ASU) report:
We observed the field of 200219C, detected by both Fermi/GBM (Fermi GBM Team, GCN Circ. 27145) and Fermi/LAT (Dirirsa et al., GCN Circ. 27151), with the DDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2020-02-20 UTC.
We observed from 2020-02-20 11:37 UTC to 2020-02-13 13:08 UTC (from 11.7 to 13.2 hours after the event) obtaining 72 minutes of exposure in the w filter. We calibrate our images against the APASS catalog. Our 5-sigma limiting magnitude is w = 20.4.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogs, we detect no uncatalogued sources in the Fermi/LAT error region (Dirirsa et al., GCN Circ. 27151) to our 5-sigma limit.
The Fermi/LAT error includes the probably XRT afterglow candidate (Evans et al., GCN Circ. 27152) at 17:30:02.34 +10:32:22.9 J2000 (source #2 at https://www.swift.ac.uk/xrt_products/TILED_GRB00088/). We see no evidence for an optical counterpart at this position to our 5-sigma limit.
We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.
GCN Circular #27157
D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 200219C (Dirirsa et al. GCN Circ. 27151) in a series of observations tiled on the sky. The total exposure time is 2.4 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.4 ks. The data were collected between T0+43.0 ks and T0+56.0 ks, and are entirely in Photon Counting (PC) mode.
Two uncatalogued X-ray sources are detected, of which one ("Source 2") is above the RASS limit, and is therefore likely the GRB afterglow. Using 2417 s of PC mode data and 5 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 262.50899, +10.53933 which is equivalent to:
```
RA (J2000): 17h 30m 02.16s
Dec(J2000): +10d 32' 21.6"
```
with an uncertainty of 2.1 arcsec (radius, 90% confidence). This position is 12.9 arcmin from the Fermi/LAT position. The light curve is consistent with a constant source of mean count rate 1.1e-01 ct/sec. A power-law fit gives an index of 0.9 (+1.4, -1.5).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+/-0.4). The best-fitting absorption column is 3.2 (+1.6, -1.4) x 10^21 cm^-2, in excess of the Galactic value of 1.2 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.2 (+1.6, -1.4) x 10^21 cm^-2
Galactic foreground: 1.2 x 10^21 cm^-2
Excess significance: 2.4 sigma
Photon index:	     2.1 (+/-0.4)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020973. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00088.
This circular is an official product of the Swift-XRT team.
GCN Circular #27161
D. Xu, X. Liu, Z.P. Zhu, B.Y. Yu, Y. Ma (NAOC), X. Gao (Urumqi No.1 Senior High School) report:
We observed the field of the possible X-ray afterglow by Swift/XRT (Burrows et al., GCN 27157) of GRB 200219C detected by Fermi/GBM and Fermi/LAT (GCN 27145; Dirirsa et al., GCN 27151), using the 0.6m NEXT telescope located at Nanshan, Xinjiang, China. Observations started at 22:45:55 UT on 2020-02-20 (i.e., 22.8 h after the Fermi trigger) and 10x300 s Sloan r-band frames were obtained.
No optical counterpart is detected in our stacked image at the Swift XRT position, down to a limiting magnitude of r~21.0.
Inspection of PanSTARRS reveals a faint, extended source within the XRT error circle. It's localized at coordinates: R.A. (J2000) = 17:30:02.21, Dec.(J2000) = +10:32:22.69, and has r = 22.70 +/- 0.15 mag. Thus is may be the host galaxy of the GRB, if the Swift XRT detection is the afterglow of the GRB.
GCN Circular #27162
I. Reva (FAPHI), A. Pozanenko (IKI), M. Krugov (FAPHI), with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory
A. Pozanenko (IKI), S. Belkin (IKI), E. Klunko (ISTP), I. Reva (FAPHI), M. Krugov (FAPHI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200219С (The Fermi GBM team, GCN 27145; Dirirsa et al., GCN 27151; Hamburg et al., GCN 27155) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on Feb. 20 (UT) 21:21:45 and with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Feb. 20 (UT) 23:17:45. Within enhanced XRT position of XRT afterglow (Burrows et al., GCN 27157) we detected an optical object in coordinates of (J2000) 17:30:02.275 +10:32:22.47 with uncertainities of 0.3 arcsec in both coordinates. Coordinates are consistent with possible host galaxy (Xu et al., GCN 27161) which is presented in Pan-STARRS catalaog. Preliminary photometry of the object is following.
```
Date UT start t-T0 Filter Exp. OT Err UL(3sigma)   telesope
                         (mid, days) (s)
2020-02-20 21:21:45 0.90596 R 40*60 21.55 0.15 22.2 AZT-33IK
2020-02-20 23:17:45 0.99207 R 56*60 n/d   n/d  21.3 Z-1000
```
Photometry is based on the USNO-B2.0 nearby stars.
```
USNO-B1.0    R2
1005-0285285 17.74
1005-0285301 19.23
1005-0285213 19.99
```
The object is somewhat brighter than that presented in Pan-STARRS DR1, and we suggest this object is a candidate for the afterglow of GRB 200115A.
GCN Circular #27163
S. Sugita, A. Yoshida, T. Sakamoto, V. Pal'shin (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The long GRB 200219C (Fermi GBM detection: Fermi GBM Team, GCN Circ. 27145, Hamburg et al., GCN Circ. 27155; Fermi-LAT detection: Dirirsa et al., GCN Circ. 27151; https://gcn.gsfc.nasa.gov/other/200219C.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 23:57:10.630 UTC on 19 February 2020. The burst signal was seen by only the SGM detector.
The burst light curve shows a multi-peaked pulse which starts at T+0.1 sec, peaks at T+1.6 sec and ends at T+4.6 sec. The T90 and T50 durations measured by the SGM data are 4.0 +- 0.7 sec and 2.1 +- 0.9 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1266191565/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #27166
M. Blazek, D. A. Kann (both HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), C. C. Thoene, J. F. Agui Fernandez (both HETH/IAA-CSIC), N. Maicas, and J. L. Lamadrid (both CEFCA) report:
We observed the position of the Fermi GBM/LAT GRB 200219C (Fermi GBM team, GCN #27145, Hamburg et al., GCN #27155, Dirirsa et al., GCN #27151) with the Javalambre Observatory OAJ 80cm telescope in g'r'i'z', obtaining 3 x 300 s exposures in g'r' each, and 5 x 180 s exposures in i'z' each. Observations started on 2020-02-21, 03:17:55 UT. No observations were obtained the night before as the LAT position came only after twilight had started.
In the stacked r' image (midtime 1.14375 days after the GRB), we clearly detect a source within the enhanced XRT error circle (Burrows et al., GCN #27157) for which we measure r'(AB) = 22.11 � 0.13 mag against PanSTARRS field stars.
We note this implies a decay compared with the afterglow discovery by Reva et al. (GCN #27162) who find R ~ 21.72 � 0.15 mag (AB) about six hours earlier. It is still brighter than the PanSTARRS host galaxy magnitude given by Xu et al. (GCN #27161) at r' = 22.70 � 0.15 mag.
The relatively bright host galaxy may be indicative of a low-redshift event. As the source is improving in visibility and will be observable for several months to come, a search for associated supernova emission may be worthwhile. Spectroscopy is encouraged.
GCN Circular #27180
V. D’Elia (SSDC) reports on behalf of the Swift-XRT team:
We provide an update on the XRT light curve evolution of the candidate X-ray afterglow of GRB 200219C (GCN Circ. 27157).
The XRT light curve now comprises data up to 260 ks from the Fermi trigger (GCN Circs. 27151 and 27155). There is a firm indication of fading with respect to the first observation, with a decay index of 0.8 (+0.4 -0.3). We thus confirm that this is indeed the afterglow of GRB 200219C. The latest results can be viewed via: https://www.swift.ac.uk/xrt_curves/00020973/
This circular is an official product of the Swift-XRT team.
GCN Circular #27228
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 200219C (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27145; Hamburg et al., GCN Circ. 27155; Fermi-LAT detection: Dirirsa et al., GCN Circ. 27151; CALET-GBM detection: Sugita et al., GCN Circ. 27163) triggered Konus-Wind at T0=86229.162 s UT (23:57:09.162).
The burst light curve shows a bright peak which starts at ~T0-3.4 s and has a duration of ~9.8 s, followed by a weaker emission seen up to ~T0+23 s. Total burst duration is ~27 s. The emission is seen up to ~4 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200219_T86229
As observed by Konus-Wind, the burst had a fluence of 1.87(-0.11,+0.13)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+3.488 s, of 5.40(-1.08,+1.23)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+29.952 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.08(-0.12,+0.12) and Ep = 209(-21,+27) keV (chi2 = 60/61 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.6 (chi2 = 60/60 dof).
The spectrum near the maximum count rate (measured from T0+0.256 to T0+5.376 s) is best fit in the 20 keV - 4 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.83(-0.10,+0.12), the high energy photon index beta = -3.58(-6.42,+0.82), the peak energy Ep = 234(-22,+20) keV (chi2 = 62/75 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #27298
V. Cunningham (UMD), S. B. Cenko (NASA GSFC), S. Vogel (UMD)
We observed the Fermi GBM/LAT GRB 200219C (The Fermi GBM Team, GCN 27145; Dirirsa et al., GCN 27151; Hamburg et al., GCN 27155) at 6 GHz with the Karl G. Jansky Very Large Array (VLA) on 2020 Feb 25 11:23:02 UTC (5.48 days post GBM trigger). We report a preliminary flux density of ~658 uJy at position:
```
RA (J2000): 17:30:02.295 +/- 0.011
Dec (J2000): +10:32:22.237 +/- 0.011
```
This is consistent with the position of the potential host galaxy (Xu et al., GCN 27161), optical afterglow (Reva et al., GCN 27162; Blazek et al., GCN 27166), and X-ray afterglow (Burrows et al., GCN 27157).
We thank the VLA staff for their assistance in completing these observations.

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Jochen Greiner, last update: 03-Mar-2020 [Disclaimer]