{
  "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 <1 yr −1 . Based on the inferred component masses, these candidates are consistent with signals from binary black holes (BBHs) and neutron star–black hole binaries (GW230518_125908 and GW230529_181500). Median-inferred component masses of BBHs in the catalog now range from 5.79M⊙ (GW230627_015337) to 137 M ⊙ (GW231123_135430), while GW231123_135430 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, GW230814_230901 and GW231226_101520, 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.",
  "abstract_shown": true,
  "affiliations": [
    "Max Planck Institute for Gravitational Physics (Albert Einstein Institute)",
    "LIGO Hanford Observatory",
    "INFN",
    "Università di Salerno",
    "University of Warwick",
    "Monash University",
    "The Pennsylvania State University",
    "Leibniz Universität Hannover",
    "University of Wisconsin-Milwaukee",
    "California Institute of Technology",
    "Louisiana State University",
    "Tata Institute of Fundamental Research",
    "Aix-Marseille Université",
    "Université catholique de Louvain",
    "Queen Mary University of London",
    "University of California",
    "University of Minnesota",
    "Instituto Nacional de Pesquisas Espaciais",
    "Université Paris Cité",
    "Università di Roma Tor Vergata",
    "Universiteit Antwerpen",
    "International Centre for Theoretical Sciences",
    "University College Dublin",
    "National Astronomical Observatory of Japan",
    "Friedrich-Schiller-Universität Jena",
    "Università degli Studi di Genova",
    "Univ. Savoie Mont Blanc",
    "Università di Napoli “Federico II,”",
    "Cardiff University",
    "Australian National University",
    "Massachusetts Institute of Technology",
    "Maastricht University",
    "Nikhef",
    "Università di Roma “La Sapienza,”",
    "Aix Marseille Univ",
    "Université Paris-Saclay",
    "University of Tokyo",
    "Institut de Física d’Altes Energies (IFAE)",
    "Gran Sasso Science Institute (GSSI)",
    "University of Florida"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 100,
  "authors": [
    {
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        0
      ],
      "name": "Adrian Abac",
      "orcid": "0000-0003-4786-2698"
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    {
      "affs": [
        1
      ],
      "name": "I. Abouelfettouh"
    },
    {
      "affs": [
        2,
        3
      ],
      "name": "F. Acernese",
      "orcid": "0000-0003-3103-3473"
    },
    {
      "affs": [
        4
      ],
      "name": "K. Ackley",
      "orcid": "0000-0002-8648-0767"
    },
    {
      "affs": [
        5
      ],
      "name": "Christian Adamcewicz",
      "orcid": "0000-0001-5525-6255"
    },
    {
      "affs": [
        6
      ],
      "name": "S. Adhicary",
      "orcid": "0009-0004-2101-5428"
    },
    {
      "affs": [
        7,
        0
      ],
      "name": "D. Adhikari"
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    {
      "affs": [
        8
      ],
      "name": "N. Adhikari",
      "orcid": "0000-0002-4559-8427"
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    {
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        9
      ],
      "name": "R. X. Adhikari",
      "orcid": "0000-0002-5731-5076"
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    {
      "affs": [
        10
      ],
      "name": "V. K. Adkins"
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    {
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        11
      ],
      "name": "Samsuzzaman Afroz",
      "orcid": "0009-0004-4459-2981"
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        12
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      "name": "A. Agapito",
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      "name": "D. Agarwal",
      "orcid": "0000-0002-8735-5554"
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      "name": "M. Agathos",
      "orcid": "0000-0002-9072-1121"
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      "name": "Nancy Aggarwal",
      "orcid": "0000-0002-0026-3877"
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      "name": "S. Aggarwal"
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      "name": "Odylio D. Aguiar",
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      "name": "I.-L. Ahrend"
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      "name": "L. Aiello",
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      "name": "A. Ain",
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      "name": "P. Ajith",
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      "name": "Sarp Akçay",
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      "name": "Tomotada Akutsu",
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      "name": "Simone Albanesi",
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        25
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      "name": "W. Ali"
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        0
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      "name": "S. Al-Kershi"
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        26
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      "name": "C. Alléné"
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        2,
        27
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      "name": "A. Allocca",
      "orcid": "0000-0002-5288-1351"
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      "name": "S. Al-Shammari"
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        29
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      "name": "P. A. Altin",
      "orcid": "0000-0001-8193-5825"
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    {
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        30
      ],
      "name": "S. Álvarez-López",
      "orcid": "0009-0003-8040-4936"
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    {
      "affs": [
        26
      ],
      "name": "W. Amar"
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    {
      "affs": [
        28
      ],
      "name": "O. Amarasinghe"
    },
    {
      "affs": [
        31,
        32
      ],
      "name": "A. Amato",
      "orcid": "0000-0001-9557-651X"
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    {
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        2,
        33
      ],
      "name": "F. Amicucci",
      "orcid": "0009-0005-2139-4197"
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    {
      "affs": [
        34
      ],
      "name": "Claude Amra",
      "orcid": "0000-0002-4618-5931"
    },
    {
      "affs": [
        9
      ],
      "name": "A. Ananyeva"
    },
    {
      "affs": [
        9
      ],
      "name": "S. B. Anderson",
      "orcid": "0000-0003-2219-9383"
    },
    {
      "affs": [
        9
      ],
      "name": "Warren G. Anderson",
      "orcid": "0000-0003-0482-5942"
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    {
      "affs": [
        35
      ],
      "name": "M. Andia",
      "orcid": "0000-0003-3675-9126"
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    {
      "affs": [
        36
      ],
      "name": "M. Ando"
    },
    {
      "affs": [
        37
      ],
      "name": "Marc Andrés-Carcasona",
      "orcid": "0000-0002-8738-1672"
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    {
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        38,
        2,
        7,
        0
      ],
      "name": "T. Andrić",
      "orcid": "0000-0002-9277-9773"
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        39
      ],
      "name": "J. Anglin"
    },
    {
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        2
      ],
      "name": "Stefano Ansoldi",
      "orcid": "0000-0002-5613-7693"
    },
    {
      "name": "Javier Mauricio Antelis",
      "orcid": "0000-0003-3377-0813"
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    {
      "affs": [
        35
      ],
      "name": "S. Antier",
      "orcid": "0000-0002-7686-3334"
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    {
      "name": "M. Aoumi"
    },
    {
      "affs": [
        2
      ],
      "name": "E. Z. Appavuravther"
    },
    {
      "affs": [
        9
      ],
      "name": "S. Appert"
    },
    {
      "name": "S. K. Apple",
      "orcid": "0009-0007-4490-5804"
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    {
      "affs": [
        9
      ],
      "name": "Koji Arai",
      "orcid": "0000-0001-8916-8915"
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    {
      "affs": [
        36
      ],
      "name": "A. Araya",
      "orcid": "0000-0002-6884-2875"
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    {
      "affs": [
        9
      ],
      "name": "M. C. Araya",
      "orcid": "0000-0002-6018-6447"
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    {
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        38,
        2
      ],
      "name": "Manuel Arca Sedda",
      "orcid": "0000-0002-3987-0519"
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    {
      "name": "J. S. Areeda",
      "orcid": "0000-0003-0266-7936"
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      ],
      "name": "N. Aritomi"
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        2,
        25
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      "name": "F. Armato",
      "orcid": "0000-0002-8856-8877"
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    {
      "name": "Sharon Armstrong",
      "orcid": "0009-0009-4285-2360"
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      "name": "N. Arnaud",
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  "bibtex": "https://research.draconitic.com/paper/5cmz9ggpyqc3h.bib",
  "cited_by": 137,
  "doi": "10.3847/2041-8213/ae2c74",
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  "id": "5cmz9ggpyqc3h",
  "issns": [
    "2041-8205",
    "2041-8213"
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  "landing_url": "https://doi.org/10.3847/2041-8213/ae2c74",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
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  "published": "2026-06-18",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/5cmz9ggpyqc3h.ris",
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      "url": "https://doi.org/10.3847/2041-8213/ae2c74"
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  "subjects": [
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      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
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  ],
  "title": "GWTC-4.0: Updating the Gravitational-wave Transient Catalog with Observations from the First Part of the Fourth LIGO–Virgo–KAGRA Observing Run",
  "title_text": "GWTC-4.0: Updating the Gravitational-wave Transient Catalog with Observations from the First Part of the Fourth LIGO–Virgo–KAGRA Observing Run",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T13:21:01Z",
  "url": "https://research.draconitic.com/paper/5cmz9ggpyqc3h",
  "venue": "The Astrophysical Journal Letters",
  "versions": []
}