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GCN Circular 27021

Subject
LIGO/Virgo S200208q : upper limits from AGILE/GRID observations
Date
2020-02-08T17:52:26Z (4 years ago)
From
Francesco Longo at U of Trieste,INFN Trieste <franzlongo1969@gmail.com>
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
obtained:
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.
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