[vsnet-grb-info 22011] LIGO-Virgo S190412m: AGILE GRID observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24110
SUBJECT: LIGO-Virgo S190412m: AGILE GRID observations
DATE:    19/04/12 15:41:29 GMT
FROM:    Fabrizio Lucarelli at SSDC/INAF-OAR  <fabrizio.lucarelli at ssdc.asi.it>

F. Lucarelli (SSDC, and INAF-OAR), G. Piano (INAF/IAPS), F. Verrecchia, C. Pittori
(SSDC, and INAF-OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
M. Cardillo, C. Casentini, A. Ursi (INAF/IAPS), A. Bulgarelli, 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 S190412m at T0 = 2019-04-12 05:30:44.17 (UT)
(GCN #24098), a preliminary analysis of the AGILE exposure at T0 showed that
the S190412m 90% c.l. localization region (LR) was occulted by the Earth (GCN #24100).

We performed an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data
in the energy range 30 MeV - 10 GeV, over two separate time intervals with good exposure
of the S190412m 90% LR, before and after T0.

The following preliminary GRID values of 3-sigma upper limits (UL) are obtained:

(T0 - 700s; T0 - 600s): from 4.2e-08 to 2.1e-07 erg cm^-2 s^-1. LR coverage: <20%.

(T0 + 1600s; T0 + 1800s): from 4.1e-08 to 2.3e-07 erg cm^-2 s^-1. LR coverage: ~70%.

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