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TITLE:   GCN CIRCULAR
NUMBER:  27680
SUBJECT: AstroSat CZTI detection : GRB200503A
DATE:    20/05/03 13:05:09 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 long GRB 200503A.
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 2020-05-03 05:02:01.500 UT. The measured peak count rate associated with the burst is 2021 +/- 50.3 cts/s above the background in the combined data of four quadrants, with a total of 28736 +/- 52.5 cts. The local mean background count rate was 601 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 38.6 +/- 0.01 s. In preliminary analysis, we find that 2294 Compton events are associated with this event.
It was also clearly 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.
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TITLE:   GCN CIRCULAR
NUMBER:  27685
SUBJECT: GRB 200503A: AGILE observations
DATE:    20/05/03 19:41:20 GMT
FROM:    Alessandro Ursi at INAF/IAPS  <alessandro.ursi@gmail.com>

A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), C. Casentini (INAF/IAPS), M. Pilia
(INAF/OA-Cagliari), C. Pittori (SSDC, and INAF/OAR),  A. Argan, M.
Cardillo, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and
INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste
and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the
AGILE Team:

The AGILE satellite detected the long burst GRB 200503A at T0 = 2020-05-03
05:01:44 (UT), reported by AstroSat CZTI (GCN #27680, Gupta et al.).

The event is visible in the scientific ratemeters of the SuperAGILE (SA;
20-60 keV), Anti-Coincidence (AC, 50-200 keV), and MiniCALorimeter (MCAL;
0.4-100 MeV) detectors. The burst light curve shows a multi-peaked time
profile that lasted ~25 s. The event released 3700 counts in the AC
ratemeters (above a background of ~3500 Hz), 1800 counts in the MCAL
ratemeters (above a background of ~2600 Hz), and 560 counts in the SA
ratemeters (above a background of 40 Hz). The ratemeters light curves can
be found at http://www.agilescienceapp.it/notices/RM_GRB200503A.png .

Additional analysis of AGILE data is in progress.