[vsnet-grb-info 24650] LIGO/Virgo S200114f: upper limits from AGILE-GRID observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26749
SUBJECT: LIGO/Virgo S200114f: upper limits from AGILE-GRID observations
DATE:    20/01/14 17:06:46 GMT
FROM:    Fabrizio Lucarelli at SSDC/INAF-OAR  <fabrizio.lucarelli at ssdc.asi.it>

F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata), C. Casentini, M. Cardillo, G. Piano, A.Ursi (INAF/IAPS),
F. Verrecchia (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 S200114f at T0 = 2020-01-14
02:08:18.239 (UT), an analysis of the AGILE exposure at T0 showed that the
GW localization region (LR) was occulted by Earth (GCN #26744).

We performed an analysis of the GRID data over time intervals before and
after T0, when good exposures of the S200114f 90% c.l. LR were available.

No candidate gamma-ray transient was detected.

The following preliminary GRID values of 3-sigma upper limits (ULs) in
the 50 MeV - 10 GeV energy band are obtained over different time intervals:

- (T0 + 600 s ; T0 + 700 s): from 4.0e-08 to 4.1e-08 erg cm^-2 s^-1, with an
exposure of about 14% of the S200114f 90% c.l. LR;

- (T0 - 6 hrs; T0 + 6 hrs): from 7.3e-10 to 5.0e-09 erg cm^-2 s^-1, and

- (T0 - 3 days; T0 + 6 hrs): from 7.6e-11 to 5.3e-10 erg cm^-2 s^-1,

both with an exposure of about 53% of the S200114f 90% c.l. LR;

These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode.