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IceCube neutrino point-source searches in the direction of the KM3NeT ultra-high-energy event
Preprint   Open access

IceCube neutrino point-source searches in the direction of the KM3NeT ultra-high-energy event

R Abbasi, M Ackermann, J Adams, J. A Aguilar, M Ahlers, J. M Alameddine, S Ali, N. M Amin, K Andeen, C Argüelles, …
arXiv (Cornell University)
10 Sep 2026
DOI: https://doi.org/10.48550/arxiv.2609.10931
url
https://doi.org/10.48550/arXiv.2609.10931View
Preprint (Author's original) Open arXiv.org - Non-exclusive license to distribute

Abstract

Physics - High Energy Astrophysical Phenomena
While still under construction, the KM3NeT Astroparticle Research with Cosmics in the Abyss (ARCA) detector recorded a∼ 200 PeV neutrino on February 13th, 2023. This event is the highest-energy neutrino reported. IceCube, a cubic kilometer neutrino detector located at the geographic South Pole, has previously detected neutrinos up to approximately 10 PeV. We search for high-energy neutrinos from the location of the KM3NeT event using 15 years of IceCube data and considering three temporal hypotheses: steady or flaring in time coincidence, or at an arbitrary time. We find no evidence for neutrino emission for any of the studies performed. Correspondingly, we set upper limits on the neutrino flux from a point source in the direction of KM3-230213A. We compare these limits to KM3NeT's estimated flux and show that an astrophysical explanation of this event is strongly constrained for a variety of spectral assumptions for a steady or transient point source with the flux inferred from the single KM3NeT ultra-high-energy event assuming a spectral index of 2.0.

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