GW170817: observation of gravitational waves from a binary neutron star inspiral
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...The first detection of gravitational waves (GW) from a binary–black–hole merger (GW150914; Abbott et al. 2016), and only two years later the first detection of a binary–neutron–star merger (GW170817; Abbott et al. 2017) with associated electromagnetic counterpart (LIGO Scientific Collaboration et al. 2017; Soares-Santos et al. 2017; Arcavi et al. 2017; Coulter et al. 2017; Lipunov et al. 2017; Tanvir et al. 2017; Valenti et al. 2017), have generated tremendous excitement amongst the astrophysics community....
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...…from a binary–black–hole merger (GW150914; Abbott et al. 2016), and only two years later the first detection of a binary–neutron–star merger (GW170817; Abbott et al. 2017) with associated electromagnetic counterpart (LIGO Scientific Collaboration et al. 2017; Soares-Santos et al. 2017; Arcavi et…...
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...The addition of GW190814 and GW170814 to GW170817 improves the 68% HDI from GW170817 alone by ∼ 18%, showing how well–localized mergers without counterparts can provide a significant contribution to standard siren measurements, provided that a complete galaxy catalog is available at the location of the event....
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...As expected, GW170817 is the most constraining event, followed by GW190814 and GW170814, as a result of the increasing localization volume....
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...This event is particularly interesting for a dark standard siren analysis because counterpart searches have not identified a convincing counterpart thus far (e.g. Morgan et al. 2020; Andreoni et al. 2020; Vieira et al. 2020; Watson et al. 2020; Gomez et al. 2019; Ackley et al. 2020), and because its localization volume is the second–smallest after GW170817....
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