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A joint fermi-gbm and ligo/virgo analysis of compact binary mergers from the first and second gravitational-wave observing runs
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A joint fermi-gbm and ligo/virgo analysis of compact binary mergers from the first and second gravitational-wave observing runs

Fermi Gamma-Ray Burst Monitor, The Ligo Scientific Collaboration And The Virgo Collab, R. Hamburg, C. Fletcher, E. Burns, A. Goldstein, E. Bissaldi, M.S. Briggs, W.H. Cleveland, M.M. Giles, …
Astrophysical Journal, 卷.893(2), 100
04/2020

摘要

Astronomy and Astrophysics Space and Planetary Science
We present results from offline searches of Fermi Gamma-ray Burst Monitor (GBM) data for gamma-ray transients coincident with the compact binary coalescences observed by the gravitational-wave (GW) detectors Advanced LIGO and Advanced Virgo during their first and second observing runs. In particular, we perform follow-up for both confirmed events and low significance candidates reported in the LIGO/Virgo catalog GWTC-1. We search for temporal coincidences between these GW signals and GBM-triggered gamma-ray bursts (GRBs). We also use the GBM Untargeted and Targeted subthreshold searches to find coincident gamma-rays below the onboard triggering threshold. This work implements a refined statistical approach by incorporating GW astrophysical source probabilities and GBM visibilities of LIGO/Virgo sky localizations to search for cumulative signatures of coincident subthreshold gamma-rays. All search methods recover the short gamma-ray burst GRB 170817A occurring ∼1.7 s after the binary neutron-star merger GW170817. We also present results from a new search seeking GBM counterparts to LIGO single-interferometer triggers. This search finds a candidate joint event, but given the nature of the GBM signal and localization, as well as the high joint false alarm rate of 1.1 10 -6 Hz, we do not consider it an astrophysical association. We find no additional coincidences.

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https://doi.org/10.3847/1538-4357/ab7d3e檢視
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