TITLE:   GCN CIRCULAR
NUMBER:  20741
SUBJECT: LIGO/Virgo G275404: AGILE MCAL observations
DATE:    17/02/25 21:53:11 GMT
FROM:    Francesco Verrecchia at ASDC, INAF-OAR  <verrecchia@asdc.asi.it>

A. Ursi (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), A. Bulgarelli, V. Fioretti, N. Parmiggiani
(INAF/IASF-Bo), P. Munar-Adrover (INAF/IAPS), F. Verrecchia (ASDC and  
INAF/OAR),
A. Zoli (INAF/IASF-Bo), C. Pittori, F. Lucarelli (ASDC and INAF/OAR),
G. Piano, A. Argan (INAF/IAPS), M. Cardillo (INAF/OA-Arcetri and INAF/IAPS),
Y. Evangelista, I. Donnarumma (INAF/IAPS), G. Minervini (INAF/IAPS), F.
Fuschino, 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 G275404 at T0 = 2017-02-25
18:30:21.374 UTC, a preliminary analysis of the AGILE-GW fast data
processing procedure found no AGILE MiniCALorimeter (MCAL) event
candidates within a time interval covering -/+ 40 sec from the LIGO T0.
Two data acquisitions where collected about 45 sec before and 45 sec
after the LIGO T0; they show no significant transient candidate event.
A 3-sigma UL was computed for a 1 s integration time, on different
celestial positions within the G275404 error box, and varies from a
minimum of 5.3e-7 erg cm^-2 to a maximum of 10.3e-7 erg cm^-2, assuming as
spectral model a single power law with photon index 1.4. The AGILE-MCAL
instrument is a mini-calorimeter with a 4-PI FoV, working in the range
0.4 - 100 MeV.

Additional analysis of AGILE GRID and Super-Agile data is in progress.