TITLE:   GCN CIRCULAR
NUMBER:  24678
SUBJECT: GRB 190530A: AGILE-MCAL detection
DATE:    19/05/30 16:10:42 GMT
FROM:    Fabrizio Lucarelli at SSDC/INAF-OAR  <fabrizio.lucarelli@ssdc.asi.it>

F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista,
M. Feroci, G. Piano, A. Ursi (INAF/IAPS), 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 190530A at T0 = 2019-05-30
10:19:16.003 +/- 0.01 s (UTC), which was also detected by Fermi/GBM (GCN #24676).
The AGILE MCAL trigger occured around 8 s after the FERMI/GBM trigger.

An automatic MCAL Event Notice was also issued and is available at the GCN link:
https://gcn.gsfc.nasa.gov/agile_mcal.html

The event lasted about 12 s and released a total number of ~30900 counts in the
detector (in the 0.4-100 MeV energy range), above an average background rate of 637
counts/s.

The light curve shows two structures and several peaks, with a prompt emission
lasting around 1.6s and then, after about 5 s from T0, a second structure lasting for
around 7 s with the highest peak at around T0+7s.

The plot of the AGILE-MCAL light curve can be found at:
https://tools.ssdc.asi.it/ImgView/Agile/GRB190530A_AGILE-MCAL16

Bright emission in the 17-60 keV energy range is also detected by the SuperAGILE
instrument on-board of AGILE.

The GRB is clearly detected also by the AGILE scientific ratemeters: in particular,
the Anti-Coincidence (50-200 keV), SuperAGILE (20-60 keV), and MCAL (0.4-100 MeV)
ratemeters.

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.