GWTC-4.0: Updating the Gravitational-wave Transient Catalog with Observations from the First Part of the Fourth LIGO–Virgo–KAGRA Observing Run
Adrian Abac; I. Abouelfettouh; F. Acernese; K. Ackley; Christian Adamcewicz; S. Adhicary; D. Adhikari; N. Adhikari · 2026 · The Astrophysical Journal Letters
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Abstract
Abstract Version 4.0 of the Gravitational-Wave Transient Catalog (GWTC-4.0) adds new candidates detected by the LIGO, Virgo, and KAGRA observatories through the first part of the fourth observing run (O4a: 2023 May 24 15:00:00 to 2024 January 16 16:00:00 UTC) and a preceding engineering run. In these new data, we find 128 compact binary coalescence candidates that are identified by at least one of our search algorithms with a probability of astrophysical origin p astro ≥ 0.5 and that are not vetoed during event validation. We also provide detailed source property measurements for 86 of these t
Abstract by Adrian Abac; I. Abouelfettouh; F. Acernese; K. Ackley; Christian Adamcewicz; S. Adhicary; D. Adhikari; N. Adhikari, The Astrophysical Journal Letters (2026) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/2041-8213/ae2c74