IceCube Real-time Searches for High-energy Neutrinos Coincident with LIGO/Virgo/KAGRA Gravitational-Wave Alerts in O4a

IceCube Collaboration; R Abbasi; M Ackermann; J Adams; J. A Aguilar; M Ahlers; J M Alameddine; S Ali; N. M. Amin; K. Andeen; M Hostert

doi:10.48550/arxiv.2606.13762

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IceCube Real-time Searches for High-energy Neutrinos Coincident with LIGO/Virgo/KAGRA Gravitational-Wave Alerts in O4a

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IceCube Real-time Searches for High-energy Neutrinos Coincident with LIGO/Virgo/KAGRA Gravitational-Wave Alerts in O4a

IceCube Collaboration, R Abbasi, M Ackermann, J Adams, J. A Aguilar, M Ahlers, J M Alameddine, S Ali, N. M. Amin, K. Andeen, …

ArXiv.org

Cornell University

06/11/2026

DOI: 10.48550/arxiv.2606.13762

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Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

Gravitational-wave events from mergers of compact objects are a predicted source of high-energy neutrinos. Using data from the IceCube Neutrino Observatory, we search for neutrinos coincident with 85 significant and 945 low-significance gravitational-wave candidate events from compact binary coalescences published in real-time by the LIGO-Virgo-KAGRA collaboration during the first part of its fourth observing run (O4a) and its preceding engineering run, within a time window of±500seconds centered on the merger time. We report improvements to the online pipelines, including automatic sending of notices, which has decreased the IceCube real-time response time to gravitational-wave events. In addition, we search for long-duration neutrino emission (up to two weeks after the merger) from three candidate events: two neutron star-black hole mergers, and one low-significance gravitational-wave event with a possible subthreshold gamma-ray counterpart. We use two methods, both of which have been previously used to search for neutrino emission associated with gravitational-wave transients: an unbinned maximum likelihood analysis on significant alerts and a Bayesian analysis accounting for astrophysical priors on both significant and low-significance alerts. We find no statistically significant emission from any of the individual gravitational-wave events analyzed, and set upper limits on the time-integrated flux and energy emitted in high energy neutrinos assuming isotropic emission from each event.

Physics - High Energy Astrophysical Phenomena

Details

Title: Subtitle: IceCube Real-time Searches for High-energy Neutrinos Coincident with LIGO/Virgo/KAGRA Gravitational-Wave Alerts in O4a
Creators: IceCube Collaboration
R Abbasi (Contributor) - Loyola University Chicago
M Ackermann (Contributor) - Deutsches Elektronen-Synchrotron DESY
J Adams (Contributor) - University of Canterbury
J. A Aguilar (Contributor) - Université Libre de Bruxelles
M Ahlers (Contributor) - University of Copenhagen
J M Alameddine (Contributor) - TU Dortmund University
S Ali (Contributor) - University of Kansas
N. M. Amin (Contributor) - University of Delaware
K. Andeen (Contributor) - Marquette University
M Hostert (Contributor)
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2606.13762
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 06/11/2026
Academic Unit: Physics and Astronomy
Record Identifier: 9985175012202771

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