GCN Circular 21228
Subject
LIGO/Virgo G288732: AGILE GRID Observations
Date
2017-06-08T19:32:49Z (8 years ago)
From
Francesco Verrecchia at ASDC, INAF-OAR <verrecchia@asdc.asi.it>
C. Pittori, F. Verrecchia (ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata), F. Lucarelli (ASDC and INAF/OAR), G. Minervini
(INAF/IAPS), A. Giuliani (INAF/IASF-Mi), A. Bulgarelli, N. Parmiggiani
(INAF/IASF-Bo), I. Donnarumma (ASI), G. Piano (INAF/IAPS), M. Cardillo
(INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste),
A. Ursi (INAF/IAPS), F. Fuschino (INAF/IASF-Bo), Y. Evangelista
(INAF/IAPS),
M. Marisaldi (INAF/IASF-Bo and Bergen University), A. Argan (INAF/IAPS),
M. Pilia, A. Trois (INAF/OA-Cagliari), V. Fioretti (INAF/IASF-Bo),
report on behalf of the AGILE Team:
In response to the LIGO/Virgo GW trigger G288732 (GCN #21221), we performed
an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data on
different
timescales. On LIGO trigger time (T0=2017-06-08 02:01:16.492 UTC) the GRID
exposure covered approximately 40% of the LIGO localization region observed
with off-axis angles between 40 and 70 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 (UL) obtained within the
accessible G288732 localization region are reported below:
from 1.6e-06 to 3.1e-06 erg cm^-2 s^-1 for integration time of 2s
from 1.6e-07 to 6.8e-07 erg cm^-2 s^-1 for integration time of 20s
from 4.0e-08 to 3.0e-07 erg cm^-2 s^-1 for integration time of 100s
These ULs apply to a large fraction of the GRID-exposed LIGO localization
region.
These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.