dc.contributor.author LIGO Scientific Collaboration dc.contributor.author Virgo Collaboration dc.contributor.author Fermi GBM dc.contributor.author IceCube Collaboration dc.contributor.author AstroSat Cadmium Zinc Telluride Imager Team dc.contributor.author IPN Collaboration dc.contributor.author The Insight-Hxmt Collaboration dc.contributor.author ANTARES Collaboration dc.contributor.author The Swift Collaboration dc.contributor.author AGILE Team dc.contributor.author The 1M2H Team dc.contributor.author The Dark Energy Camera GW-EM Collaboration dc.contributor.author DES Collaboration dc.contributor.author DLT40 Collaboration dc.contributor.author GRAWITA dc.contributor.author ATCA dc.contributor.author ASKAP dc.contributor.author Las Cumbres Observatory Group dc.contributor.author OzGrav dc.contributor.author DWF dc.contributor.author AST3 Collaboration dc.contributor.author CAASTRO Collaboration dc.contributor.author VINROUGE Collaboration dc.contributor.author J-GEM dc.date.accessioned 2018-11-19T21:07:39Z dc.date.available 2018-11-19T21:07:39Z dc.date.issued 2017-10-16 dc.identifier.citation Abbott, B. P., Abbott, R., Adhikari, R. X., Ananyeva, A., Anderson, S. B., Appert, S., ... & Berger, B. K. (2017). Multi-messenger observations of a binary neutron star merger. Astrophysical Journal Letters, 848(2), L12. en_US dc.identifier.uri http://hdl.handle.net/1808/27402 dc.description.abstract On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of $\sim 1.7\,{\rm{s}}$ with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of ${40}_{-8}^{+8}$ Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 $\,{M}_{\odot }$. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at $\sim 40\,{\rm{Mpc}}$) less than 11 hours after the merger by the One-Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ~10 days. Following early non-detections, X-ray and radio emission were discovered at the transient's position $\sim 9$ and $\sim 16$ days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC 4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta. en_US dc.publisher American Astronomical Society en_US dc.rights Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. en_US dc.rights.uri http://creativecommons.org/licenses/by/3.0/ en_US dc.subject Gravitational waves dc.subject Stars: neutron dc.title Multi-messenger Observations of a Binary Neutron Star Merger en_US dc.type Article en_US kusw.kudepartment Physics and Astronomy en_US dc.identifier.doi 10.3847/2041-8213/aa91c9 en_US kusw.oaversion Scholarly/refereed, publisher version en_US kusw.oapolicy This item meets KU Open Access policy criteria. en_US dc.rights.accessrights openAccess en_US
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