GW231123: A Binary Black Hole Merger with Total Mass 190–265 $M_ødot$October 27, 2025·LIGO Scientific Collaboration,Virgo Collaboration,KAGRA Collaboration· 0 min read Cite Preprint DOIpublicationLast updated on October 27, 2025 ← GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences October 28, 2025GW250114: Testing Hawking’s Area Law and the Kerr Nature of Black Holes September 10, 2025 →