[vsnet-grb-info 20192] GRB 171227A: AGILE/MCAL detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22288
SUBJECT: GRB 171227A: AGILE/MCAL detection
DATE:    17/12/27 18:34:44 GMT
FROM:    Francesco Verrecchia at ASDC  <francesco.verrecchia at ssdc.asi.it>

F. Verrecchia (SSDC and INAF/OAR), A.Ursi (INAF/IAPS), A. Trois
(INAF/OA-Cagliari), C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata), M. Marisaldi (INAF/IASF-Bo and Bergen University),
N. Parmiggiani (INAF/IASF-Bo), F. Longo (Univ. Trieste and INFN Trieste),
A. Bulgarelli (INAF/IASF-Bo), M. Cardillo, M. Pilia (INAF/OA-Cagliari), G.
Piano (INAF/IAPS), I. Donnarumma (ASI), G. Minervini, A. Argan, Y. Evangelista
(INAF/IAPS), F. Lucarelli (SSDC and INAF/OAR),  V. Fioretti, F. Fuschino
(INAF/IASF-Bo),  A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE
Team:

The AGILE Mini-CALorimeter (MCAL) detected a long burst at
T0 = 2017-12-27 00:00:30.00 +/- 0.01 UTC in the acquired data interval (following
an internal trigger) started at T1=00:00:29.00 UTC
and ended at 00:00:46.50 UTC.
The MCAL light curve shows a multi-peaked structure, with the main part within
T0+0.70 s and T0+5.50 s and a second short peak at T0+10.50 s. The main GRB interval
released a total number of ~28190 counts at E>400 keV in the detector,
above an average background rate of 23 counts/32ms.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational
in the range 0.4 - 100 MeV.