A Joint Fermi-GBM and LIGO/Virgo Analysis of Compact Binary Mergers from the First and Second Gravitational-wave Observing Runs
- 주제(기타) Astronomy & Astrophysics
- 설명문(일반) [Hamburg, R.; Briggs, M. S.; Lesage, S.; Poolakkil, S.; Preece, R.] Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USA; [Hamburg, R.; Briggs, M. S.; Lesage, S.; Mailyan, B.; Poolakkil, S.; Veres, P.] Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsvi
- 등재 SCIE, SCOPUS
- OA유형 Green Submitted, Green Published, Green Accepted
- 발행기관 IOP PUBLISHING LTD
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000174994
- 본문언어 영어
- Published As http://dx.doi.org/10.3847/1538-4357/ab7d3e
초록/요약
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 similar to 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.x.10(-6) Hz, we do not consider it an astrophysical association. We find no additional coincidences.
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