On 2017 June 8 at 02:01:16.49 UTC, a gravitational-wave (GW) signal from the merger of two stellar-mass blackholes was observed by the two Advanced Laser Interferometer Gravitational-Wave Observatory detectors with anetwork signal-to-noise ratio of 13. This system is the lightest black hole binary so far observed, with componentmasses of 12+7-2MâŠ™7+2-2 (90% credible intervals). These lie in the range of measured black hole masses inlow-mass X-ray binaries, thus allowing us to compare black holes detected through GWs with electromagneticobservations. The source's luminosity distance is 340+140-140corresponding to redshift -0.07+0.03003. We verify thatthe signal waveform is consistent with the predictions of general relativity.
Abbott, B. P., et al. “GW170608: Observation of a 19 Solar-Mass Binary Black Hole Coalescence.” The Astrophysical Journal, vol. 851, no. 2, American Astronomical Society, Dec. 2017, p. L35, doi:10.3847/2041-8213/aa9f0c.
American Astronomical Society