[vsnet-grb-info 22264] GRB 190501A: refined position from AGILE/GRID analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24363
SUBJECT: GRB 190501A: refined position from AGILE/GRID analysis
DATE:    19/05/01 17:32:13 GMT
FROM:    Francesco Verrecchia at ASDC  <francesco.verrecchia at ssdc.asi.it>

F. Verrecchia, F. Lucarelli (SSDC, and INAF/OAR), G. Piano (INAF/IAPS), M.
Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), A. Giuliani (INAF/IASF-Mi), M.
Cardillo,
C. Casentini, A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), Y.
Evangelista
(INAF/IAPS), A. Bulgarelli, V. Fioretti, N. Parmiggiani, 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), report on behalf of the AGILE Team:

We refined the position of the long GRB 190501A detected by the Gamma-Ray
Imaging Detector (GRID) of AGILE (Lucarelli et al., GCN #24361) and
previously
reported by Ursi et al., GCN #24360.
A preliminary maximum likelihood analysis integrating from T0 to T0+500 s
yields a detection at 7 sigma with an average flux of F(E> 30
MeV)=(50+/-15)e-05
ph/cm^2/s, with the positional error box centered at R.A., Dec. (J2000) =
172.8, 64.1 deg with a mean radius of 0.8 deg (95% stat. c.l.) [ Galactic
coordinates (l,b)=(136.6, 50.8) deg ].

This is among the most intense gamma-ray flux ever detected by AGILE
from a GRB.

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