Potential Gravitational-wave and Gamma-ray Multi-messenger Candidate from 2015 October 30

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Nitz, Alexander H.; Nielsen, Alex B.; Capano, Collin D.: Potential Gravitational-wave and Gamma-ray Multi-messenger Candidate from 2015 October 30. In: Astrophysical Journal Letters 876 (2019), Nr. 1, L4. DOI: https://doi.org/10.3847/2041-8213/ab18a1

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We present a search for binary neutron star (BNS) mergers that produced gravitational waves during the first observing run of the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), and gamma-ray emission seen by either the Swift-Burst Alert Telescope (BAT) or the Fermi-Gamma-ray Burst Monitor (GBM), similar to GW170817 and GRB 170817A. We introduce a new method using a combined ranking statistic to detect sources that do not produce significant gravitational-wave or gamma-ray burst candidates individually. The current version of this search can increase by 70% the detections of joint gravitational-wave and gamma-ray signals. We find one possible candidate observed by LIGO and Fermi-GBM, 1-OGC 151030, at a false alarm rate of 1 in 13 yr. If astrophysical, this candidate would correspond to a merger at Mpc with source-frame chirp mass of . If we assume that the viewing angle must be <30° to be observed by Fermi-GBM, our estimate of the distance would become Mpc. By comparing the rate of BNS mergers to our search-estimated rate of false alarms, we estimate that there is a 1 in 4 chance that this candidate is astrophysical in origin.
License of this version: CC BY 3.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 79 84.04%
2 image of flag of United States United States 11 11.70%
3 image of flag of South Africa South Africa 1 1.06%
4 image of flag of No geo information available No geo information available 1 1.06%
5 image of flag of India India 1 1.06%
6 image of flag of China China 1 1.06%

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