GWTC-5.0: Observations from the Second Part of the Fourth LIGO-Virgo-KAGRA Observing Run and Updates to the Gravitational-Wave Transient Catalog

@misc{collaboration2026gwtc50,
  title = {{GWTC-5.0: Observations from the Second Part of the Fourth LIGO-Virgo-KAGRA Observing Run and Updates to the Gravitational-Wave Transient Catalog}},
  author = {The LIGO Scientific Collaboration and The LIGO Scientific Collaboration and The LIGO Scientific Collaboration and A. G. Abac and A. Abe and I. Abouelfettouh and F. Acernese and K. Ackley and A. Adam and S. Adhicary and D. Adhikari and R. X. Adhikari and V. K. Adkins and S. Afroz and A. Agapito and S. Aggarwal and M. Agathos and N. Aggarwal and S. Aggarwal and O. D. Aguiar and I. -L. Ahrend and L. Aiello and A. Ain and P. Ajith and T. Akutsu and L. Albers and W. Ali and S. Al-Kershi and C. Allene and S. Alvarez-Lopez and S. Al-Shammari and J. A. Alvarez and A Amato and W. Amar and O. Amarasinghe and A. Amato and F. Amicucci and C. Amra and A. B. Anand and C. Anand and A. Ananyeva and S. B. Anderson and W. G. Anderson and M. Andia and M. Ando and F. Andrade-Oliveira and M. Andrés-Carcasona and J. L. Andrey and T. Andrić and S. Antier and J. Anna and J. M. Antelis and S. Antier and T. Aoki and M. Aoumi and E. Z. Appavuravther and E. A. Appelt and S. Appert and S. K. Apple and K. Arai},
  howpublished = {arXiv (Cornell University)},
  year = {2026},
  month = may,
  doi = {10.48550/arxiv.2605.27225},
  url = {https://arxiv.org/abs/2605.27225},
  note = {CC BY},
}

TY  - UNPB
TI  - GWTC-5.0: Observations from the Second Part of the Fourth LIGO-Virgo-KAGRA Observing Run and Updates to the Gravitational-Wave Transient Catalog
AU  - The LIGO Scientific Collaboration
AU  - The LIGO Scientific Collaboration
AU  - The LIGO Scientific Collaboration
AU  - A. G. Abac
AU  - A. Abe
AU  - I. Abouelfettouh
AU  - F. Acernese
AU  - K. Ackley
AU  - A. Adam
AU  - S. Adhicary
AU  - D. Adhikari
AU  - R. X. Adhikari
AU  - V. K. Adkins
AU  - S. Afroz
AU  - A. Agapito
AU  - S. Aggarwal
AU  - M. Agathos
AU  - N. Aggarwal
AU  - S. Aggarwal
AU  - O. D. Aguiar
AU  - I. -L. Ahrend
AU  - L. Aiello
AU  - A. Ain
AU  - P. Ajith
AU  - T. Akutsu
AU  - L. Albers
AU  - W. Ali
AU  - S. Al-Kershi
AU  - C. Allene
AU  - S. Alvarez-Lopez
AU  - S. Al-Shammari
AU  - J. A. Alvarez
AU  - A Amato
AU  - W. Amar
AU  - O. Amarasinghe
AU  - A. Amato
AU  - F. Amicucci
AU  - C. Amra
AU  - A. B. Anand
AU  - C. Anand
AU  - A. Ananyeva
AU  - S. B. Anderson
AU  - W. G. Anderson
AU  - M. Andia
AU  - M. Ando
AU  - F. Andrade-Oliveira
AU  - M. Andrés-Carcasona
AU  - J. L. Andrey
AU  - T. Andrić
AU  - S. Antier
AU  - J. Anna
AU  - J. M. Antelis
AU  - S. Antier
AU  - T. Aoki
AU  - M. Aoumi
AU  - E. Z. Appavuravther
AU  - E. A. Appelt
AU  - S. Appert
AU  - S. K. Apple
AU  - K. Arai
PY  - 2026
DA  - 2026/05/26
PB  - arXiv (Cornell University)
DO  - 10.48550/arxiv.2605.27225
UR  - https://arxiv.org/abs/2605.27225
AB  - Version 5.0 of the Gravitational-Wave Transient Catalog (GWTC-5.0) adds new candidates detected by the LIGO Virgo KAGRA network of observatories through the second part of the fourth observing run (O4b: 2024 April 10 15:00:00 to 2025 January 28 17:00:00 UTC) and four days of the preceding engineering run (2024 April 6 to 2024 April 10). We find 161 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 104 candidates that have a false-alarm rate < 1yr^−1. Based on the inferred component masses, all these candidates are consistent with signals from binary black holes. Median inferred component masses in the new candidates range from 5.14M_⊙ (GW241109_115924) to 70M_⊙ (GW241116_151753). Improvements in detector sensitivity allow us to observe compact binary coalescences with increasing clarity: 5 binary-black-hole signals have network signal-to-noise ratio exceeding 30, with a maximum to date of 76.9 for GW250114_082203. Such loud signals enable more precise studies of properties of their astrophysical sources and tests of general relativity. We also present updated results up to the first part of the fourth observing run, identifying 229 candidates. This brings the total number of transients in the cumulative GWTC having p_astro ≥ 0.5 to 390, further expanding the size of the catalog and our view of the gravitational-wave universe.
SN  - 2331-8422
ER  -