The event happened at a luminosity distance of 440 +160 −180 megaparsecs (determined by the amplitude of the signal), or 1.4 ± 0.6 billion light years, corresponding to a cosmological redshift of 0.093 +0.030 −0.036 (90% credible intervals). Analysis of the signal along with the inferred redshift suggested that it was produced by the merger of two black holes with masses of 35 +5 −3 times and 30 +3 −4 times the mass of the Sun (in the source frame), resulting in a post-merger black hole of 62 +4 −3 solar masses. The mass–energy of the missing 3.0 ± 0.5 solar masses was radiated away in the form of gravitational waves.