GWTC-4.0: An introduction to version 4.0 of the Gravitational-Wave Transient Catalog

Al-Shammari, Sama, Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Ejlli, Aldo, Fairhurst, Stephen ORCID: https://orcid.org/0000-0001-8480-1961, Gottel, Alexandre ORCID: https://orcid.org/0000-0002-6215-4641, Grote, Hartmut ORCID: https://orcid.org/0000-0002-0797-3943, Hannam, Mark ORCID: https://orcid.org/0000-0001-5571-325X, Higginbotham, Samuel, Kinnear, Meryl, Kokeyama, Keiko ORCID: https://orcid.org/0000-0002-2896-1992, Kuntimaddi, Nikitha, Macleod, Duncan ORCID: https://orcid.org/0000-0002-1395-8694, North, C, Nuttall, Laura ORCID: https://orcid.org/0000-0002-8599-8791, Patra, Abhinav, Patterson, Ben, Pearce, Terri, Raymond, Vivien ORCID: https://orcid.org/0000-0003-0066-0095, Relton, Philip, Sathyaprakash, Bangalore ORCID: https://orcid.org/0000-0003-3845-7586, Skliris, Vasileios, Sutton, Patrick ORCID: https://orcid.org/0000-0003-1614-3922, Tsang, Terrence, The LIGO Scientific Collaboration, Virgo Collaboration and KAGRA Collaboration 2025. GWTC-4.0: An introduction to version 4.0 of the Gravitational-Wave Transient Catalog. The Astrophysical Journal Letters 995 (1) , L18. 10.3847/2041-8213/ae0c06

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Abstract

The Gravitational-Wave Transient Catalog (GWTC) is a collection of short-duration (transient) gravitational-wave signals identified by the LIGO–Virgo–KAGRA Collaboration in gravitational-wave data produced by the eponymous detectors. The catalog provides information about the identified candidates, such as the arrival time and amplitude of the signal and properties of the signal’s source as inferred from the observational data. GWTC is the data release of this dataset, and version 4.0 extends the catalog to include observations made during the first part of the fourth LIGO–Virgo–KAGRA observing run up until 2024 January 31. This Letter marks an introduction to a collection of articles related to this version of the catalog, GWTC-4.0. The collection of articles accompanying the catalog provides documentation of the methods used to analyze the data, summaries of the catalog of events, observational measurements drawn from the population, and detailed discussions of selected candidates.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Schools > Physics and Astronomy
Additional Information:	For the full list of authors, please refer to the article webpage https://doi.org/10.3847/2041-8213/ae0c06
Publisher:	American Astronomical Society
ISSN:	2041-8205
Date of First Compliant Deposit:	18 December 2025
Date of Acceptance:	26 September 2025
Last Modified:	18 Dec 2025 15:30
URI:	https://orca.cardiff.ac.uk/id/eprint/183373

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