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TITLE:   GCN CIRCULAR
NUMBER:  27392
SUBJECT: GRB 200317A: Fermi GBM Final Real-time Localization
DATE:    20/03/17 00:50:50 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM  <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 00:40:30 UT on 17 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200317A (trigger 606098435.488212 / 200317028).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 65.5, Dec = -46.3 (J2000 degrees, equivalent to J2000 04h 21m, -46d 17'), with a statistical uncertainty of 2.7 degrees.

The angle from the Fermi LAT boresight is 50.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200317028/quicklook/glg_skymap_all_bn200317028.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/bn200317028/quicklook/glg_healpix_all_bn200317028.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200317028/quicklook/glg_lc_medres34_bn200317028.gif

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TITLE:   GCN CIRCULAR
NUMBER:  27425
SUBJECT: GRB 200317A: AstroSat CZTI detection
DATE:    20/03/24 12:16:53 GMT
FROM:    Soumya Gupta at IUCAA/ASTROSAT  <soumya@iucaa>

S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a GRB 200317A, which was also detected by Fermi GBM (GCN #27392) and Global MASTER-Net (Lipunov V. et al., GCN #27393).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 2020-03-17 00:40:30.0 UT. The measured peak count rate associated with the burst is 507 +/- 32.0 cts/s above the background in the combined data of four quadrants, with a total of 1355 +/- 8.6 cts. The local mean background count rate was 528 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 6.1 +/- 0.025 s.
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.