GWTC-4.0: Updating the Gravitational-wave Transient Catalog with Observations from the First Part of the Fourth LIGO–Virgo–KAGRA Observing Run

The Astrophysical Journal Letters 2026 Open access

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Authors: Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley, Christian Adamcewicz, S. Adhicary, D. Adhikari, N. Adhikari, R. X. Adhikari, V. K. Adkins, Samsuzzaman Afroz, A. Agapito
+88 more D. Agarwal, M. Agathos, N. Aggarwal, S. Aggarwal, Odylio D. Aguiar, I.-L. Ahrend, L. Aiello, A. Ain, P. Ajith, Sarp Akçay, T. Akutsu, Simone Albanesi, W. Ali, S. Al-Kershi, C. Alléné, A. Allocca, S. Al-Shammari, P. A. Altin, S. Álvarez-López, W. Amar, O. Amarasinghe, A. Amato, F. Amicucci, C. Amra, A. Ananyeva, S. B. Anderson, W. G. Anderson, M. Andia, M. Ando, M. Andrés‐Carcasona, T. Andrić, J. Anglin, Stefano Ansoldi, Javier M. Antelis, S. Antier, M. Aoumi, E. Z. Appavuravther, S. Appert, S. K. Apple, K. Arai, A. Araya, M. C. Araya, Manuel Arca Sedda, J. S. Areeda, N. Aritomi, F. Armato, S. Armstrong, N. Arnaud, M. Arogeti, Scott Aronson, K. G. Arun, G. Ashton, Y. Aso, L. Asprea, M Assiduo, S. Assis de Souza Melo, S. M. Aston, P. Astone, F. Attadio, F. Aubin, K. AultONeal, Guerino Avallone, E. A. Avila, S. Babak, C. Badger, S. Bae, S. Bagnasco, Luca Baiotti, R. Bajpai, T Baka, A. M. Baker, K. A. Baker, Tessa Baker, G. Baldi, N. Baldicchi, M. Ball, G Ballardin, S. W. Ballmer, S. Banagiri, B. Banerjee, D. Bankar, T. M. Baptiste, Pratyusava Baral, M. Baratti, J. C. Barayoga, B. C. Barish, D. Barker, N. Barman
DOI: 10.3847/2041-8213/ae2c74
Cited by: 71
References: 237

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 that have a false-alarm rate

Fields of Study & Subjects

Pulsars and Gravitational Waves Research Astrophysical Phenomena and Observations Gamma-ray bursts and supernovae

Publication details

Journal / source
The Astrophysical Journal Letters
Publisher
American Astronomical Society
Volume
1004
Issue
2
Pages
L22–L22
Publication date
18 June 2026
Language
EN