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TITLE:   GCN CIRCULAR
NUMBER:  27412
SUBJECT: GRB 200318A: Fermi GBM Final Real-time Localization
DATE:    20/03/18 22:45:44 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 22:35:27 UT on 18 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200318A (trigger 606263732.221512 / 200318941).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 123.4, Dec = 59.1 (J2000 degrees, equivalent to J2000 08h 13m, 59d 06'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 14.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200318941/quicklook/glg_skymap_all_bn200318941.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/bn200318941/quicklook/glg_healpix_all_bn200318941.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200318941/quicklook/glg_lc_medres34_bn200318941.gif

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TITLE:   GCN CIRCULAR
NUMBER:  27426
SUBJECT: GRB 200318A : AstroSat CZTI detection
DATE:    20/03/24 12:17:59 GMT
FROM:    Soumya Gupta at IUCAA/ASTROSAT  <soumya@iucaa>

S. Gupta, V. Sharma 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 long GRB 200318A, which was also detected by Fermi GBM (GCN #27412).​ 
The source was clearly detected in the 40-200 keV energy range. The light curve shows a single peak of emission peaking at​ 2020-03-18​ 22:35:27​ UT. The measured peak count rate associated with the burst is​ 197 +/- 21.6​ cts/s above the background in the combined data of four quadrants, with a total of​ 990 +/- 48.8​ cts. The local mean background count rate was 566 +/- 3.1 cts/s. Using cumulative rates, we measure a T90 of 10.1 +/- 0.33 s.
It was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
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.