GCN Circular 21434

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

In response to the LIGO/Virgo GW event G296853 at T0 = 2017-08-09 08:28:21.747
UTC, a preliminary analysis of the AGILE MiniCALorimeter (MCAL) data found
no event candidates within a time interval covering approximately -/+ 10 sec
from the LIGO T0.

3-sigma ULs were computed for a 1 s integration time on different celestial
positions within the G296853 90% localization region, taking into consideration
the nearest triggered data acquisition (about 14 sec after the LIGO T0),
resulting in typical values of the fluence UL ranging from 6.3e^-7 erg cm^-2
to 7.0e^-7 erg cm^-2 (assuming as spectral model a power law with photon index
1.4). The AGILE-MCAL detector is a CsI detector with a 4-pi FoV, working in
the range 0.4 - 100 MeV. Additional analysis of AGILE data is in progress.