[vsnet-grb-info 22262] GRB 190501A: AGILE/GRID detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24361
SUBJECT: GRB 190501A: AGILE/GRID detection
DATE:    19/05/01 12:17:54 GMT
FROM:    Fabrizio Lucarelli at SSDC/INAF-OAR  <fabrizio.lucarelli at ssdc.asi.it>

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

The Gamma-Ray Imaging Detector (GRID) of AGILE detected a gamma-ray transient
temporally coincident with the long bright GRB 190501A reported by Ursi et al.,
GCN #24360. Given the rarity of this transient, we consider it the gamma-ray
counterpart of GRB 190501A.

A preliminary GRID analysis in the energy range 30 MeV - 1 GeV shows a
detection with a statistical significance of about 18 sigma, at the
sky position R.A., Decl. (J2000): 174,+65 +/- 5 deg (Galactic coordinates l,b:
135,+50 deg), over a time integration of 20 s starting from the T0 of GRB 190501A.

The preliminary estimated position is below the GRID 30 deg off-axis angle.

These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.