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GCN Circular 24759

Subject
Fermi trigger No 581478912 / GRB 190606A: AGILE/MCAL observations
Date
2019-06-06T10:15:56Z (5 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), N. Parmiggiani
(INAF/OAS-Bologna), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A.
Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F.
Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F.
Fuschino (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 the short burst GRB190606.08
(Fermi trigger No 581478912) at T0 = 2019-06-06 01:55:07.80 +/- 0.01 s
(UTC).

The event lasted about 0.22 s and released a total number of ~660 counts in
the detector (in the 0.4-100 MeV energy range), above an average background
rate of 660 counts / s.

The light curve shows a single sharp peak and can be found at
http://www.agilescienceapp.it/notices/GRB_062876_486870907.795776.png.

The time-integrated spectrum of the burst in 0.22 s can be fitted in the
energy range [0.4-100 MeV] with a single power law with ph.ind = 2.32
-0.12/+0.14, resulting in a reduced chi-square of 1.62 (86 d.o.f.). The
burst fluence in the same energy range and time interval is 1.71e-6
erg/cm^2 (90% confidence level).

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.
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