On September 14, 2015, at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) simultaneously observed the binary black hole merger GW150914. We report the results of a matched-filter search using relativistic models of compact-object binaries that recovered GW150914 as the most significant event during the coincident observations between the two LIGO detectors from September 12 to October 20, 2015 GW150914 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 203000 years, equivalent to a significance greater than 5.1 σ.
B. P. Abbott et al., "GW150914: First Results from the Search for Binary Black Hole Coalescence with Advanced LIGO," Physical Review D, vol. 93, no. 12, American Physical Society (APS), Jun 2016.
The definitive version is available at https://doi.org/10.1103/PhysRevD.93.122003
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01 Jun 2016