The LIGO Scientific Collaboration and Virgo Collaboration observed a gravitational wave signal, GW151226, from the coalescence of two black holes with masses of approximately 14.2 and 7.5 solar masses. The signal was detected on December 26, 2015, by the LIGO detectors. It was identified through matched-filter searches and confirmed with a network signal-to-noise ratio of 13 and a significance greater than 5σ. The signal lasted about 1 second, increasing in frequency and amplitude from 35 to 450 Hz, reaching a peak gravitational strain of 3.4×10⁻²². The final black hole mass was 20.8 solar masses, and the source was located at a luminosity distance of 440 Mpc, corresponding to a redshift of 0.09. The study provides improved constraints on stellar populations and deviations from general relativity. The observation confirms the existence of binary black hole mergers and contributes to the understanding of gravitational wave sources. The results are consistent with previous observations and support the theoretical predictions of binary black hole formation. The study also highlights the importance of gravitational wave astronomy in probing the universe.The LIGO Scientific Collaboration and Virgo Collaboration observed a gravitational wave signal, GW151226, from the coalescence of two black holes with masses of approximately 14.2 and 7.5 solar masses. The signal was detected on December 26, 2015, by the LIGO detectors. It was identified through matched-filter searches and confirmed with a network signal-to-noise ratio of 13 and a significance greater than 5σ. The signal lasted about 1 second, increasing in frequency and amplitude from 35 to 450 Hz, reaching a peak gravitational strain of 3.4×10⁻²². The final black hole mass was 20.8 solar masses, and the source was located at a luminosity distance of 440 Mpc, corresponding to a redshift of 0.09. The study provides improved constraints on stellar populations and deviations from general relativity. The observation confirms the existence of binary black hole mergers and contributes to the understanding of gravitational wave sources. The results are consistent with previous observations and support the theoretical predictions of binary black hole formation. The study also highlights the importance of gravitational wave astronomy in probing the universe.