LIGO/Virgo S190930s: no counterpart candidates in AGILE-GRID observations
Abstract
In response to the LIGO/Virgo GW event S190930s at T0 = 2019-09-30 13:35:41 (UT), a preliminary analysis of the AGILE exposure at T0 shows that the Gamma-Ray Imaging Detector (GRID) exposure covered about 27% of the 90% c.l. localization region (LR) (40% of 90% c.l. LR is occulted by Earth) at an off-axis angle of about 5 degrees. We performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV on T0, where good exposure of the S190930s 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 1.0e-06 to 4.9e-06 erg cm^-2 s^-1, with exposure of about 27% of the LR over the time interval ( T0 -2s ; T0 + 2s ); - from 8.4e-07 to 2.5e-06 erg cm^-2 s^-1, with exposure of about 26% of the LR over the time interval ( T0s ; T0 + 10s ); - from 1.4e-07 to 1.6e-06 erg cm^-2 s^-1, with exposure of about 26% of the LR over the time interval ( T0 ; 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.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- September 2019
- Bibcode:
- 2019GCN.25884....1A