TITLE:   GCN CIRCULAR
NUMBER:  26724
SUBJECT: LIGO/Virgo S200112r: upper limits from AGILE/GRID observations
DATE:    20/01/12 20:24:32 GMT
FROM:    Francesco Verrecchia at SSDC,INAF-OAR  <francesco.verrecchia@ssdc.asi.it>

F. Verrecchia (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), M. Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, G. Piano, A. Ursi
(INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli,
V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia
(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 S200112r at T0 = 2020-01-12
15:58:38.094 UTC a preliminary analysis of the AGILE exposure at T0 shows
that the Gamma-Ray Imaging Detector (GRID) exposure covered the 28% of the
90% c.l. localization region (LR) (11% of the LR is occulted by Earth).

We performed an analysis of the GRID data in the energy range 50 MeV - 10
GeV on T0, where good exposure of the S200112r 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 7.4e-07 to 6e-06 erg cm^-2 s^-1, with exposure of about 28% of the LR
over the time interval ( T0 -2s ; T0 + 2s );
from 3.0e-07 to 9.1e-06 erg cm^-2 s^-1, with exposure of about 27% of the LR
over the time interval ( T0s ; T0 + 10s );
from 7.7e-08 to 1e-05 erg cm^-2 s^-1, with exposure of about 36% 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.