[vsnet-grb-info 26256] AGILE detection of a burst (AGILE trigger no. 526185273)

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28356
SUBJECT: AGILE detection of a burst (AGILE trigger no. 526185273)
DATE:    20/09/03 11:17:47 GMT
FROM:    Alessandro Ursi at INAF/IAPS  <alessandro.ursi at gmail.com>

A. Ursi (INAF/IAPS), F. Verrecchia, C. Pittori (SSDC, and INAF/OAR), P.
Tempesta (TeleSpazio), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
A. Argan, M. Cardillo, C. Casentini, 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), 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 satellite detected a long burst at T0 = 2020-09-03 02:34:34 (UT).
The event is clearly visible in the scientific ratemeters of the SuperAGILE
(SA; 18-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence
(AC; 50-200 keV) detectors. The light curves show multiple emission
episodes. The main episode lasted ~30 s and released 155300 counts in the
SA detector (above a background rate of 62 Hz), 70500 counts in the MCAL
detector (above a background rate of 1240 Hz), and 3850 counts in the AC
detector (above a background rate of 3070 Hz). Several successive spikes
follow the main episode. The AGILE ratemeters light curves can be found at:
http://www.agilescienceapp.it/notices/burst200903023434_AGILE_RMs.png .

The event also triggered a MCAL high time resolution data acquisition
covering the first ~5 s of the GRB. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/GRB_069402_526185273.882807.png .

The event is compatible with the event reported by CALET (trigger ID
1283135531) and INTEGRAL SPI-ACS (trigger ID 8707,0).

The burst might be related with GRB 200903B reported by Fermi-GBM (GCN
#28352), occurring at 2020-09-03 02:42:40 (UT).

Additional analysis of AGILE data is in progress.