TITLE:   GCN CIRCULAR
NUMBER:  10560
SUBJECT: GRB 100331B: SuperAGILE Localization of a Long GRB
DATE:    10/04/01 09:04:47 GMT
FROM:    Marco Feroci at IASF/INAF  <sa.grb@iasf-roma.inaf.it>

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto,
L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda  
(INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P.  
Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari),  
S. Vercellone, F. D'Ammando (INAF/IASF Palermo), A. Bulgarelli, F.  
Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M.  
Marisaldi, M. Galli (INAF/IASF Bologna), M. Tavani, G. Pucella, V.  
Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome),  
G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza,
A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza  
(Universita' dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and   
P. Giommi, C. Pittori,
F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI),
on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 31 March 2010, at 21:08:38 UT.
The event had a duration of about 30 s in the 20-60 keV energy range,
with a multi-peak structure. AGILE is currently operating in a  
spinning mode and the reported duration may be a lower limit to the  
GRB duration.

The burst position was reconstructed as (RA, Dec)
(302.987, -11.067) deg, which is:

RA(J2000)  = 20h 11m 56.95s
Dec(J2000) = -11d 04' 02.04"

with an uncertainty of 6' radius to account for possible systematics  
error due to the spinning mode.

The GRB is not detected by the AGILE/MCAL (above 350 keV) nor AGILE/GRID
(30 MeV - 30 GeV)."

This message may be cited.