Abstract
Abstract We search for gravitational-wave transients associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (2019 April 1 15:00 UTC–2019 October 1 15:00 UTC). A total of 105 GRBs were analyzed using a search for generic gravitational-wave transients; 32 GRBs were analyzed with a search that specifically targets neutron star binary mergers as short GRB progenitors. We find no significant evidence for gravitational-wave signals associated with the GRBs that we followed up, nor for a population of unidentified subthreshold signals. We consider several source types and signal morphologies, and report for these lower bounds on the distance to each GRB.
Highlights
Gamma-ray bursts (GRBs) are transient flashes of gamma radiation of cosmological origin observed at a rate of 1 per day (Nakar 2007)
During O3a we used the generic transient method to follow up a total of 105 gamma-ray bursts (GRBs), whereas the modeled search was applied to the 32 GRB triggers classified as short or ambiguous
For all of the most GW-signal-like triggers associated with the examined GRBs, the searches returned no significant probability of incompatibility with background alone (p-value)
Summary
Gamma-ray bursts (GRBs) are transient flashes of gamma radiation of cosmological origin observed at a rate of 1 per day (Nakar 2007). Gravitational waves (GWs) will be radiated by the core-collapse process, (e.g., Fryer & New 2011). Several models of this process do not yield radiation that is detectable by the current generation of GW interferometers beyond Galactic distances (Abbott et al 2020c). Rotational instabilities and instabilities induced by the additional presence of an accretion disk as part of the GRB engine may enhance the GW emission, making it detectable even for extragalactic sources
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