The paper presents the results of a search for binary black hole (BBH) mergers using data from the first Advanced LIGO observing run, conducted from September 12, 2015, to January 19, 2016. The search identified two significant BBH merger events: GW150914 and GW151226, both with signal-to-noise ratios (SNRs) greater than 5σ. A third candidate event, LVT151012, was observed but did not meet the significance threshold for a confirmed detection. The properties of these events were inferred using relativistic models of BBH waveforms, and the results are consistent with predictions based on general relativity. The study also constrained the rates of BBH mergers in the universe and explored the mass distribution of black hole mergers. The findings provide valuable insights into the astrophysical implications of these events and set the stage for future observations with Advanced LIGO and Virgo.The paper presents the results of a search for binary black hole (BBH) mergers using data from the first Advanced LIGO observing run, conducted from September 12, 2015, to January 19, 2016. The search identified two significant BBH merger events: GW150914 and GW151226, both with signal-to-noise ratios (SNRs) greater than 5σ. A third candidate event, LVT151012, was observed but did not meet the significance threshold for a confirmed detection. The properties of these events were inferred using relativistic models of BBH waveforms, and the results are consistent with predictions based on general relativity. The study also constrained the rates of BBH mergers in the universe and explored the mass distribution of black hole mergers. The findings provide valuable insights into the astrophysical implications of these events and set the stage for future observations with Advanced LIGO and Virgo.