[vsnet-grb-info 24832] LIGO/Virgo S200129m: upper limits from AGILE/GRID observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26931
SUBJECT: LIGO/Virgo S200129m: upper limits from AGILE/GRID observations
DATE:    20/01/29 09:38:59 GMT
FROM:    Carlotta Pittori at ASI SSDC, INAF-OAR  <carlotta.pittori at ssdc.asi.it>

C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano, A. Ursi (INAF/IAPS),
F. Lucarelli (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 S200129m at T0 = 2020-01-29
06:54:58.435 (UT) a preliminary analysis of the AGILE exposure at T0 shows that
the Gamma-Ray Imaging Detector (GRID) exposure covered less than 10% of
the 90% c.l. localization region (LR) (due to solar panel constraints).

We performed an analysis of the GRID data in the energy range 50 MeV -
10 GeV over time intervals before and after T0, where good exposure of the
S200129m 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 8.3e-07 to 9.1e-06 erg cm^-2 s^-1, with exposure of about 51% of the LR over
the time interval ( T0 + 100s ; T0 + 200s );

These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.