Upper Limits on the Isotropic Gravitational-Wave Background from the first part of LIGO, Virgo, and KAGRA's fourth Observing RunAugust 28, 2025·LIGO Scientific Collaboration,Virgo Collaboration,KAGRA Collaboration· 0 min read Cite PreprintpublicationLast updated on August 28, 2025 ← Directed searches for gravitational waves from ultralight vector boson clouds around merger remnant and galactic black holes during the first part of the fourth LIGO-Virgo-KAGRA observing run September 9, 2025Analysis of GWTC-3 with fully precessing numerical relativity surrogate models August 1, 2025 →