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TITLE:   GCN CIRCULAR
NUMBER:  27677
SUBJECT: GRB 200502A: Fermi GBM Final Real-time Localization
DATE:    20/05/02 13:56:49 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 13:46:33 UT on 2 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200502A (trigger 610119998.856084 / 200502574).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 289.5, Dec = 38.6 (J2000 degrees, equivalent to J2000 19h 18m, 38d 36'), with a statistical uncertainty of 2.7 degrees.

The angle from the Fermi LAT boresight is 138.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200502574/quicklook/glg_skymap_all_bn200502574.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/bn200502574/quicklook/glg_healpix_all_bn200502574.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200502574/quicklook/glg_lc_medres34_bn200502574.gif

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TITLE:   GCN CIRCULAR
NUMBER:  27684
SUBJECT: GRB 200502A: AGILE observations
DATE:    20/05/03 19:41:14 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 200502A, reported by
Fermi/GBM (GCN #27677; trigger 610119998.856084/200502574) at T0 =
2020-05-02 13:46:33 (UT).

The event is visible in the scientific ratemeters of the SuperAGILE (SA;
20-60 keV) detector. The event lasted ~30 s and released a total number of
~1000 counts in the SA ratemeters (above a background of ~45 Hz). The SA
ratemeters light curve can be found at
http://www.agilescienceapp.it/notices/RM_SA_GRB200502A.png .

Additional analysis of AGILE data is in progress.
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TITLE:   GCN CIRCULAR
NUMBER:  27686
SUBJECT: GRB 200502A: AstroSat CZTI detection
DATE:    20/05/04 08:39:09 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 200502A, which was also detected by Fermi GBM (GCN #27677) and  AGILE (Ursi A. et al., GCN #27684).

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 2020-05-02 13:46:33.887 UT. The measured peak count rate associated with the burst is 151 +/- 19 cts/s above the background in the combined data of four quadrants, with a total of 650 +/- 18 cts. The local mean background count rate was 540 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 7.67 +/- 0.10 s.

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.