GCN Circular 21701
Subject
LIGO/Virgo G299232: AGILE GRID observations
Date
2017-08-25T17:58:16Z (8 years ago)
From
Francesco Verrecchia at ASDC, INAF-OAR <verrecchia@asdc.asi.it>
G. Piano, M. Cardillo (INAF/IAPS), F. Verrecchia (SSDC and INAF/OAR), M.
Pilia (INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
A. Bulgarelli (INAF/IASF-Bo), C. Pittori (SSDC and INAF/OAR), I. Donnarumma
(ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Ursi, G. Minervini, A.
Argan, Y. Evangelista (INAF/IAPS), F. Lucarelli (ASDC and INAF/OAR), N.
Parmiggiani, A. Zoli, V. Fioretti, F. Fuschino (INAF/IASF-Bo), A. Trois
(INAF/OA-Cagliari) M. Marisaldi (INAF/IASF-Bo and Bergen University), A.
Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
In response to the LIGO/Virgo GW trigger event G299232 at T0 = 2017-08-25
13:13:37.983 UTC (GCN #21693), we performed an analysis of the AGILE
Gamma-Ray Imaging Detector (GRID) data on different timescales. On LIGO/Virgo
trigger time (T0) the GRID exposure covered nearly 42% of the LIGO/Virgo
localization region (at 90% confidence level; LR), observed at off-axis
angles between 20 and 55 deg.
An analysis of the data in the energy range 50 MeV - 10 GeV was performed
on timescales from 2 to 100 sec centered at T0.
Preliminary values of 3-sigma upper limits (ULs) obtained within the
accessible LIGO/Virgo 3-sigma LR are reported below:
from 1.5e-06 to 7.8e-06 erg cm^-2 s^-1 for integration time of 2s
from 1.5e-07 to 7.8e-07 erg cm^-2 s^-1 for integration time of 20s
from 3.9e-08 to 2.2e-07 erg cm^-2 s^-1 for integration time of 100s
These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.