GCN Circular 21062

A. Ursi (INAF/IAPS), F. Verrecchia (SSDC/ASDC and INAF/OAR), M. Pilia
(INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C.
Pittori (ASDC and INAF/OAR), G. Minervini (INAF/IAPS), F. Lucarelli (ASDC
and INAF/OAR), A. Bulgarelli, V. Fioretti, A. Zoli, N. Parmiggiani, F.
Fuschino (INAF/IASF-Bo), M. Cardillo, G. Piano, A. Argan, Y. Evangelista
(INAF/IAPS), I. Donnarumma (ASI), M. Marisaldi (Bergen University and
INAF/IASF-Bo), 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 G284239 at T0 = 2017-05-02
22:26:07.910
UTC, a preliminary analysis of the AGILE-GW fast data processing procedure
found no AGILE MiniCALorimeter (MCAL) event candidates within a time
interval
covering +/-50 s from the LIGO T0.

MCAL data acquisition was collected between 15 s and 2 s before the LVC T0.
A preliminary analysis shows no significant transient candidate event, at
different time scales. 3-sigma ULs were computed for a 1 s integration
time,
on different celestial positions within the accessible G284239 localization
region. They vary from a minimum of 6.6e-7 erg cm^-2 to a maximum of
1.7e-6 erg cm^-2, assuming a single power law spectrum with photon index
1.4.
The AGILE-MCAL instrument is a CsI calorimeter with a 4PI FoV, sensitive in
the energy range 0.4 - 100 MeV. Additional analysis of AGILE data is in
progress.