Gamma-ray Burst 200216A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 16 Feb 20 09:07:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     603536850
GRB_RA:          317.750d {+21h 11m 00s} (J2000),
                 317.995d {+21h 11m 59s} (current),
                 317.142d {+21h 08m 34s} (1950)
GRB_DEC:          +9.967d {+09d 58' 00"} (J2000),
                 +10.050d {+10d 02' 59"} (current),
                  +9.762d {+09d 45' 42"} (1950)
GRB_ERROR:       36.85 [deg radius, statistical plus systematic]
GRB_INTEN:       47 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18895 TJD;    47 DOY;   20/02/16
GRB_TIME:        32845.03 SOD {09:07:25.03} UT
GRB_PHI:         343.00 [deg]
GRB_THETA:        65.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.32
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   9%  Cyg X-1
DETECTORS:       0,1,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       329.36d {+21h 57m 26s}  -12.46d {-12d 27' 30"}
SUN_DIST:         25.18 [deg]   Sun_angle= 0.8 [hr] (West of Sun)
MOON_POSTN:      241.27d {+16h 05m 04s}  -17.75d {-17d 44' 55"}
MOON_DIST:        80.67 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:       59.89,-24.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      323.54, 24.97 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_lc_medres34_bn200216380.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.73,22.40 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 16 Feb 20 09:08:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     603536850
GRB_RA:          313.650d {+20h 54m 36s} (J2000),
                 313.895d {+20h 55m 35s} (current),
                 313.041d {+20h 52m 10s} (1950)
GRB_DEC:          +9.040d {+09d 02' 24"} (J2000),
                  +9.118d {+09d 07' 03"} (current),
                  +8.849d {+08d 50' 56"} (1950)
GRB_ERROR:       14.67 [deg radius, statistical only]
DATA_SIGNIF:     5.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18895 TJD;    47 DOY;   20/02/16
GRB_TIME:        32845.03 SOD {09:07:25.03} UT
GRB_PHI:         339.00 [deg]
GRB_THETA:        67.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       329.36d {+21h 57m 26s}  -12.46d {-12d 27' 30"}
SUN_DIST:         26.49 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      241.27d {+16h 05m 04s}  -17.75d {-17d 44' 57"}
MOON_DIST:        76.56 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:       56.52,-22.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      318.97, 25.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_lc_medres34_bn200216380.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_603536850.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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 16 Feb 20 09:16:40 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     603536850
GRB_RA:          318.730d {+21h 14m 55s} (J2000),
                 318.979d {+21h 15m 55s} (current),
                 318.110d {+21h 12m 26s} (1950)
GRB_DEC:          +6.550d {+06d 32' 60"} (J2000),
                  +6.634d {+06d 38' 04"} (current),
                  +6.342d {+06d 20' 30"} (1950)
GRB_ERROR:       11.41 [deg radius, statistical only]
GRB_DATE:        18895 TJD;    47 DOY;   20/02/16
GRB_TIME:        32845.03 SOD {09:07:25.03} UT
GRB_PHI:         345.00 [deg]
GRB_THETA:        68.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       329.36d {+21h 57m 27s}  -12.46d {-12d 27' 22"}
SUN_DIST:         21.70 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
MOON_POSTN:      241.35d {+16h 05m 24s}  -17.77d {-17d 46' 14"}
MOON_DIST:        80.36 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:       57.44,-27.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      323.34, 21.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_lc_medres34_bn200216380.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_locplot_all_bn200216380.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.

GCN Circular #27097
The Fermi GBM team reports the detection of a likely LONG GRB
At 09:07:25 UT on 16 Feb 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200216A (trigger 603536850.030844 / 200216380).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 318.7, Dec = 6.5 (J2000 degrees, equivalent to J2000 21h 14m, 6d 30'), with a statistical uncertainty of 11.4 degrees.
The angle from the Fermi LAT boresight is 68.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_skymap_all_bn200216380.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/bn200216380/quicklook/glg_healpix_all_bn200216380.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200216380/quicklook/glg_lc_medres34_bn200216380.gif
GCN Circular #27107
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), and Jamie Kennea (PSU) report:
Swift/BAT did not trigger on GRB 200216A.
The Fermi/GBM Flight-Position notice, distributed at T0+24 seconds, from the Fermi/GBM detected GRB 200216A (GCN. 27096) triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, in prep).
The GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
Upon trigger by the Fermi notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of GRB 200216A.
All the requested event mode data was delivered to the ground.
In a ground analysis of the data, using the normal BAT imaging technique, we detect GRB 200216A with a SNR of 7.5.
With a more sophisticated maximum likelihood analysis (DeLaunay et al., 2020 in prep.) on the event-mode data we detect GRB 200216A more confidently, with a square root of the test statistic (sqrt(TS)) of 15.4. The sqrt(TS) behaves similarly to SNR.
The BAT ground-calculated position is RA, Dec = 311.4378, -11.6580 deg which is
```
   RA(J2000)  = 311d 26' 16.08"
   Dec(J2000) = -11d 39' 28.8"
```
with an uncertainty of 3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 40%.
This arcminute location is consistent with the localization region distributed by the Fermi/GBM team (GCN. 27096).
No XRT or UVOT follow-up will take place due to the source's proximity to the sun (1.2 hours). We encourage follow-up from instruments capable of observing near the sun.
GCN Circular #27112
S. Lesage, B. Mailyan, S. Poolakkil, and C. Meegan (all UAH) report on behalf of the Fermi GBM Team:
"At 09:07:25.03 UT on 16 February 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 200216A (trigger 603536850 / 200216380) which was also detected via Swift ground analysis (DeLaunay et al. 2020, GCN 27107) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 68 degrees.
The GBM light curve consists of a single bright pulse followed by some extended emission with a duration (T90) of about 8.0 s (10-1000 keV). The time-averaged spectrum from T0-5.0 s to T0+2.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is 0.9 +/- 0.9 and the cutoff energy, parameterized as Epeak, is 180.0 +/- 34.0 keV
The event fluence (10-1000 keV) in this time interval is (4.4 +/- 0.9)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0-4.16 s in the 10-1000 keV band is 0.92 +/- 0.1 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/"

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Jochen Greiner, last update: 27-Feb-2020 [Disclaimer]