Breakthrough Tracker record
Observation of an ultra-high-energy cosmic neutrino with KM3NeT
KM3NeT detected KM3-230213A, a through-going muon event consistent with a cosmic neutrino whose estimated energy is about 220 PeV. It is the highest-energy cosmic neutrino observed to date.
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- Stable ID
km3net-ultra-high-energy-neutrino-2025- Revision
km3net-ultra-high-energy-neutrino-2025.v1- Field
- Astronomy · Astroparticle physics and high-energy neutrino astronomy
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed experimental observation
- Last checked
AI role
No AI assistance was disclosed in the paper or linked reporting.
Record details
- Problem or result
- Extending neutrino observations into the ultra-high-energy regime and identifying their cosmic sources
- Authors
- KM3NeT Collaboration
- Institutions
- International KM3NeT collaboration
- Result date
- Observed February 13, 2023; published February 12, 2025
Why it matters
The event opens an observational window in which cosmogenic neutrinos and extreme cosmic accelerators may become distinguishable.
Limits
This is one event, its source has not been identified and origin scenarios remain speculative. A March 2025 author correction fixed a surname only and did not alter the scientific result.
Sources
- Primary: KM3NeT paper in Nature
- Primary: Nature author correction
- Independent: Le Monde specialist reporting
Correction and revision history
- Initial entry; the non-substantive author-name correction is recorded explicitly.
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