Fermi-LAT observations of the LIGO/Virgo event GW170817
Fermi-LAT Collaboration

TL;DR
This paper reports on Fermi-LAT observations of the neutron star merger GW170817, setting upper limits on high-energy gamma-ray emission on various timescales, and discusses future detection prospects.
Contribution
It provides the first constraints on high-energy gamma-ray emission from GW170817 over extended timescales using Fermi-LAT data.
Findings
No high-energy gamma-ray emission detected post-merger
Established flux upper bounds in the 0.1-1 GeV range
Compared luminosity limits to other short gamma-ray bursts
Abstract
We present the Fermi Large Area Telescope (LAT) observations of the binary neutron star merger event GW170817 and the associated short gamma-ray burst (SGRB) GRB\,170817A detected by the Fermi Gamma-ray Burst Monitor. The LAT was entering the South Atlantic Anomaly at the time of the LIGO/Virgo trigger () and therefore cannot place constraints on the existence of high-energy (E 100 MeV) emission associated with the moment of binary coalescence. We focus instead on constraining high-energy emission on longer timescales. No candidate electromagnetic counterpart was detected by the LAT on timescales of minutes, hours, or days after the LIGO/Virgo detection. The resulting flux upper bound (at 95\% C.L.\/) from the LAT is 10 erg cm s in the 0.1--1 GeV range covering a period from T0 + 1153 s to T0 + 2027 s. At the distance of GRB\,170817A,…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Pulsars and Gravitational Waves Research · Advanced X-ray and CT Imaging
