LIGO/Virgo G296853: AGILE GRID observations
Abstract
In response to the LIGO/Virgo GW trigger G296853 (GCN #21431), we performed an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data on different timescales. On LIGO trigger time (T0=2017-08-09 08:28:21.747 UTC) the GRID exposure covered more than the 95% of the LIGO localization region, observed at off-axis angles between 5 and 55 deg. An analysis of the data in the energy range 50 MeV - 10 GeV was performed on timescales from 2 to 100 sec centered at T0. Preliminary values of 3-sigma upper limits (UL) obtained within the accessible G296853 localization region are reported below: from 1.4e-06 to 6.0e-06 erg cm^-2 s^-1 for integration time of 2s from 1.4e-07 to 5.6e-07 erg cm^-2 s^-1 for integration time of 20s from 3.1e-08 to 8.4e-08 erg cm^-2 s^-1 for integration time of 100s These ULs apply to a large fraction of the GRID-exposed LIGO localization region. These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2017
- Bibcode:
- 2017GCN.21437....1V