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GCN Circular 28314

Subject
GRB 200829A: AGILE/MCAL detection
Date
2020-08-29T19:23:40Z (4 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y.
Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and
INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
M. Pilia, 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 Mini-CALorimeter (MCAL) detected GRB 200829A at T0 = 2020-08-29
13:58:30.90 +/- 0.01 s (UTC), reported by Swift-BAT (Siegel et al., GCN
#28307) and Swift-UVOT (Kuin et al., GCN #28311).

The event lasted about 5.6 s and it released a total number of ~15550
counts in the detector (in the 0.4-100 MeV energy range), above an average
background rate of 570 Hz.

The time-integrated spectrum of the burst can be fitted in the energy range
0.4-20 MeV with a single power-law with ph.ind. = 2.26 -0.03/+0.03,
resulting in a reduced chi-squared of 1.67 (62 d.o.f.) and a fluence of
6.2e-05 ergs/cm^2 (90% confidence level), in the same energy range.

The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/GRB_069336_525794310.907011.png .

The event is also clearly visible in the scientific ratemeters (RMs) of the
SuperAGILE (18-60 keV), MCAL (0.4-100 MeV), and Anti-Coincidence (50-200
keV) detectors. Their light curves can be found at
http://www.agilescienceapp.it/notices/GRB200829A_AGILE_RMs.png .

The AGILE/MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the
energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.
Automatic MCAL GRB alert Notices can be found at:
https://gcn.gsfc.nasa.gov/agile_mcal.html.
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