GWTC-4.0: Updating the Gravitational-wave Transient Catalog with Observations from the First Part of the Fourth LIGO–Virgo–KAGRA Observing RunJune 18, 2026·LIGO Scientific Collaboration,Virgo Collaboration,KAGRA Collaboration· 0 min read Cite Preprint DOIpublicationLast updated on June 18, 2026 ← GWTC-4.0: Methods for Identifying and Characterizing Gravitational-wave Transients June 18, 2026Open Data from LIGO, Virgo, and KAGRA through the First Part of the Fourth Observing Run June 18, 2026 →