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On September 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected a gravitational-wave transient (GW150914) ; we characterize the properties of the source and its parameters. The data around the time of the event were analyzed coherently across the LIGO network using a suite of accurate waveform models that describe gravitational waves from a compact binary system in general relativity. GW150914 was produced by a nearly equal mass binary black hole of masses 36-₄^+5M⊙ and 29-₄^+4M⊙; for each parameter we report the median value and the range of the 90% credible interval. The dimensionless spin magnitude of the more massive black hole is bound to be <0. 7 (at 90% probability). The luminosity distance to the source is 410-₁₈₀^+160 Mpc, corresponding to a redshift 0. 09-₀. ₀₄^+0. 03 assuming standard cosmology. The source location is constrained to an annulus section of 610 deg^2, primarily in the southern hemisphere. The binary merges into a black hole of mass 62-₄^+4M⊙ and spin 0. 67-₀. ₀₇^+0. 05. This black hole is significantly more massive than any other inferred from electromagnetic observations in the stellar-mass regime.
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