# Observation of Gravitational Waves from a Binary Black Hole Merger

**B. P. Abbott****R. Abbott****Thomas Diamond Abbott****M. R. Abernathy****F. Acernese****K. Ackley****Carrie Reinhardt Adams****T. Adams****P. Addesso****R. X. Adhikari****V. B. Adya****C. Affeldt****Michalis Agathos****K. Agatsuma****N. Aggarwal****O. D. Aguiar****L. Aiello****A. Ain****P. Ajith****B Allen****A. Allocca****P. A. Altin****Shaquana Anderson****W. G. Anderson****Koji Arai****M. A. Arain****M. C. Araya****C. C. Arceneaux****J. S. Areeda****N. Arnaud****K G Arun****S. Ascenzi****G. Ashton****M. Ast****S. M. Aston****P. Astone****P. Aufmuth****C. Aulbert****S. Babak****Paul Bacon****M. K. M. Bader****P. Baker****F. Baldaccini****G. Ballardin****S. Ballmer****J. C. Barayoga****S. E. Barclay****B. Barish****D. Barker****F. Barone**

CiteWeb id: 20160000050

CiteWeb score: 720

DOI: 10.1103/PhysRevLett.116.061102

On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of 1.**0**×10^(−21). It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410 +160/−180 Mpc corresponding to a redshift z=**0**.09 +**0**.03/−**0**.04. In the source frame, the initial black hole masses are 36+5−4M_⊙ and 29+4−4M_⊙, and the final black hole mass is 62+4−4M⊙, with 3.**0**+**0**.5−**0**.5M_⊙c^2 radiated in gravitational waves. All uncertainties define 90% credible intervals. These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger.

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