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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 M ⊙ (GW231123₁35430), while GW231123₁35430 was probably produced by the most massive binary observed in the catalog. For the first time, we have discovered BBH signals with network signal-to-noise ratio exceeding 30, GW230814₂30901 and GW231226₁01520, enabling high-fidelity studies of the waveforms and astrophysical properties of these systems. Combined with the 90 candidates included in GWTC-3. 0, the catalog now contains 218 candidates with p astro ≥ 0. 5 and not otherwise vetoed, more than doubling the size of the catalog and further opening our view of the gravitational-wave Universe.
Abac et al. (Thu,) studied this question.