# GW170814: a three-detector observation of gravitational waves from a binary black hole coalescence

Abbott, B P; Abbott, R; Abbott, T D; Acernese, F; Ackley, K; Adams, C; Adams, T; Addesso, P; Adhikari, R X; Adya, V B; Affeldt, C; Afrough, M; Agarwal, B; Agathos, M; Agatsuma, K; Aggarwal, N; Aguiar, O D; Aiello, L; Ain, A; Ajith, P; Allen, B; Allen, G; Allocca, A; Altin, P A; Amato, A; Ananyeva, A; Anderson, S B; Anderson, W G; Angelova, S V; Antier, S; et al (2017). GW170814: a three-detector observation of gravitational waves from a binary black hole coalescence. Physical Review Letters, 119:141101.

## Abstract

On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coalescence of two stellar mass black holes, with a false-alarm rate of $\lesssim$ 1 in 27 000 years. The signal was observed with a three-detector network matched-filter signal-to-noise ratio of 18. The inferred masses of the initial black holes are $30.5^{+5.7}_{-3.0}M_{\odot}$ and $25.3^{+2.8}_{−4.2}M_{\odot}$ (at the 90% credible level). The luminosity distance of the source is $540^{+130}_{−210} Mpc$, corresponding to a redshift of $z = 0.11^{+0.03}_{−0.04}$. A network of three detectors improves the sky localization of the source, reducing the area of the 90% credible region from 1160  $deg^2$ using only the two LIGO detectors to 60 $deg^2$ using all three detectors. For the first time, we can test the nature of gravitational-wave polarizations from the antenna response of the LIGO-Virgo network, thus enabling a new class of phenomenological tests of gravity.

## Abstract

On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coalescence of two stellar mass black holes, with a false-alarm rate of $\lesssim$ 1 in 27 000 years. The signal was observed with a three-detector network matched-filter signal-to-noise ratio of 18. The inferred masses of the initial black holes are $30.5^{+5.7}_{-3.0}M_{\odot}$ and $25.3^{+2.8}_{−4.2}M_{\odot}$ (at the 90% credible level). The luminosity distance of the source is $540^{+130}_{−210} Mpc$, corresponding to a redshift of $z = 0.11^{+0.03}_{−0.04}$. A network of three detectors improves the sky localization of the source, reducing the area of the 90% credible region from 1160  $deg^2$ using only the two LIGO detectors to 60 $deg^2$ using all three detectors. For the first time, we can test the nature of gravitational-wave polarizations from the antenna response of the LIGO-Virgo network, thus enabling a new class of phenomenological tests of gravity.

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