GW170608: Observation of a 19 Solar-mass Binary Black Hole Coalescence

Abbott,; and Abbott, B. P.; and Abbott, R.; and Acernese, T. D.; and Ackley, F.; and Adams, K.; and Adams, C.; and Addesso, T.; and Adhikari, P.; and Adya, R. X.; and Affeldt, V. B.; and Afrough, C.; and Agarwal, M.; and Agathos, B.; and Agatsuma, M.; and Aggarwal, K.; and Aguiar, N.; and Aiello, O. D.; and Ain, L.; and Ajith, A.; and Allen, P.; and Allen, B.; and Allocca, G.; and Altin, A.; and Amato, P. A.; and Ananyeva, A.; and Anderson, A.; and Anderson, S. B.; and Angelova, W. G.; and Antier, S. V.; and Appert, S.; and Arai, S.; and Araya, K.; and Areeda, M. C.; and Arnaud, J. S.; and Arun, N.; and Ascenzi, K. G.; and Ashton, S.; and Ast, G.; and Aston, M.; and Astone, S. M.; and Atallah, P.; and Aufmuth, D. V.; and Aulbert, P.; and AultONeal, C.; and Austin, K.; and Avila-Alvarez, C.; and Babak, A.; and Bacon, S.; and Bader, P.; and Bae, M. K. M.; and Baker, S.; and Baldaccini, P. T.; and Ballardin, F.; and Ballmer, G.; and Banagiri, S. W.; and Barayoga, S.; and Barclay, J. 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doi:10.3847/2041-8213/aa9f0c

On 2017 June 8 at 02:01:16.49 UTC, a gravitational-wave (GW) signal from the merger of two stellar-mass black holes was observed by the two Advanced Laser Interferometer Gravitational-Wave Observatory detectors with a network signal-to-noise ratio of. 13. This system is the lightest black hole binary so far observed, with component masses of 12(2)(+7) M-circle dot and 7(2)(+2) M-circle dot (90\% credible intervals). These lie in the range of measured black hole masses in low-mass X-ray binaries, thus allowing us to compare black holes detected through GWs with electromagnetic observations. The source's luminosity distance is 340(-140)(+140) Mpc, corresponding to redshift 0.07(-0.03)(+0.03). We verify that the signal waveform is consistent with the predictions of general relativity.