Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 17: Neutrino Astronomy I

T 17.1: Vortrag

Montag, 16. März 2026, 16:15–16:30, KS H C

Search for coincidences between IceCube sub-TeV neutrinos and sub-threshold Gravitational Wave events in the LIGO-Virgo-KAGRA third observing run — •Tista Mukherjee for the IceCube collaboration — Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Since the first direct detection of gravitational waves (GW) by the LIGO-Virgo-KAGRA detectors, the IceCube Neutrino Observatory has actively participated in identifying their neutrino counterparts. The sub-threshold GW alerts from the third observation run of LIGOVirgo-KAGRA, identified by both template-based searches and minimally modelled pipelines, have also been examined in follow-up analyses with TeV-PeV neutrinos, but no correlations were found. This work presents a systematic search for lower-energy neutrino emission from the sub-threshold GWs, utilising the archival all-flavour, sub-TeV neutrino sample from the IceCube Neutrino Observatory. From the public GW catalogues, we identify 103 promising candidates, comprising a mixture of compact binary mergers and GW burst triggers. After conducting a catalogue search to identify correlated sub-TeV neutrinos within a 1000 s time window, employing an unbinned maximum likelihood method, no significant coincidences are found. Hence, we report neutrino flux upper limits from the sub-threshold GW sources followed up in this analysis within sub-TeV neutrino energy.

Keywords: Multi-messenger searches; Neutrinos; Gravitational Waves; IceCube; LIGO-Virgo-KAGRA