Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 27021

LIGO/Virgo S200208q : upper limits from AGILE/GRID observations
2020-02-08T17:52:26Z (4 years ago)
Francesco Longo at U of Trieste,INFN Trieste <>
M. Cardillo (INAF/IAPS), F. Longo (Univ. Trieste, and INFN Trieste),
M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Casentini,
G. Piano, A. Ursi (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia
(SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani
(INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari),
report on behalf of the AGILE Team:

In response to the LIGO-Virgo GW event S200208q at T0 = 2020-02-08
13:01:17.991 (UTC) a preliminary analysis of the AGILE exposure at T0
shows that the Gamma-Ray Imaging Detector (GRID) exposure covered
the 37% of the 90% c.l. localization region (LR).

We performed an analysis of the GRID data in the energy range 50 MeV -
10 GeV on T0, where good exposure of the S200208q 90% c.l. LR
was available.

No candidate gamma-ray transient was detected.

The following preliminary GRID values of 3-sigma upper limit (UL) are
from 7.0e-08 to 7.4e-06 erg cm^-2 s^-1, with exposure of about 72% of
the LR over the time interval ( T0s ; T0 + 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.
Looking for U.S. government information and services? Visit