GCN Circular 33444
Subject
GRB 230307A: AGILE/MCAL analysis
Date
2023-03-09T19:41:32Z (2 years ago)
From
Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>
C. Casentini (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR),
A.Ursi (ASI), C. Pittori (SSDC, and INAF/OAR),
M. Tavani (INAF/IAPS and Uni. Roma Tor Vergata),
F. Lucarelli (SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista,
L. Foffano, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli,
A. Di Piano, V. Fioretti, G.Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University),
M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, E. Menegoni,
A. Giuliani (INAF/IASF-Mi) and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:
We carried out further analysis of the AGILE/MCAL data of GRB 230307A
(GCNs #33405, #33406, #33407, #33410, #33411, #33412, #33413, #33414,
#33415, #33416, #33418, #33419, #33424, #33425, #33427, #33428, #33429
#33430, #33431, #33434, #33437, #33438, #33439, 33442, 33443)
The burst released 229697 counts in the detector in 18s, above a background
rate of 545 Hz.
The spectral analysis shows a clear component up to 8 MeV.
The time-integrated spectrum of the burst can be fitted in the energy range
0.6-6.5 MeV with a Band model with alpha = -0.43 (+/-0.06),
beta = -5.1 (+/-0.7), peak energy Epeak = 1260 keV (+/- 42 keV).
The fit results in a reduced chi-squared of 1.607 (34 d.o.f.) and a
fluence of 1.3e-03 erg/cm^2, in the same energy range.
MCAL spectrum in the selected 18 s time interval can be found at:
http://www.agilescienceapp.it/notices/GRB230307A_AGILE-MCAL_spectral_analysis.png
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.