{"work":{"id":"02fead5c-2c76-45ff-ab77-22e34d49f644","openalex_id":null,"doi":null,"arxiv_id":"1606.04855","raw_key":null,"title":"GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence","authors":null,"authors_text":"B","year":2016,"venue":"gr-qc","abstract":"We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. The signal was initially identified within 70 s by an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with a network signal-to-noise ratio of 13 and a significance greater than 5 $\\sigma$. The signal persisted in the LIGO frequency band for approximately 1 s, increasing in frequency and amplitude over about 55 cycles from 35 to 450 Hz, and reached a peak gravitational strain of $3.4_{-0.9}^{+0.7} \\times 10^{-22}$. The inferred source-frame initial black hole masses are $14.2_{-3.7}^{+8.3} M_{\\odot}$ and $7.5_{-2.3}^{+2.3} M_{\\odot}$ and the final black hole mass is $20.8_{-1.7}^{+6.1} M_{\\odot}$. We find that at least one of the component black holes has spin greater than 0.2. This source is located at a luminosity distance of $440_{-190}^{+180}$ Mpc corresponding to a redshift $0.09_{-0.04}^{+0.03}$. All uncertainties define a 90 % credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.","external_url":"https://arxiv.org/abs/1606.04855","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-25T18:36:09.191004+00:00","pith_arxiv_id":"1606.04855","created_at":"2026-05-10T10:04:06.690817+00:00","updated_at":"2026-05-25T18:36:09.191004+00:00","title_quality_ok":true,"display_title":null,"render_title":"GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence"},"hub":{"state":{"work_id":"02fead5c-2c76-45ff-ab77-22e34d49f644","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":26,"external_cited_by_count":null,"distinct_field_count":7,"first_pith_cited_at":"2019-03-11T17:43:43+00:00","last_pith_cited_at":"2026-05-22T15:38:33+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-05-30T13:21:08.611706+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":17}],"polarity_counts":[{"context_polarity":"background","n":15},{"context_polarity":"support","n":1},{"context_polarity":"unclear","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}