Limits RegistryPUBLIC RECORD
Limits RegistryKM3-230213A, detected on 13 February 2023 by the KM3NeT/ARCA undersea telescope off Sicily and reported in Nature on 12 February 2025, had an estimated energy of about 220 PeV — around 30 times higher than any neutrino previously observed. Its origin is unknown; it may be a cosmogenic neutrino produced by ultra-high-energy cosmic rays.
The question, scope, and sources behind this Registry record.
KM3-230213A, detected on 13 February 2023 by the KM3NeT/ARCA undersea telescope off Sicily and reported in Nature on 12 February 2025, had an estimated energy of about 220 PeV — around 30 times higher than any neutrino previously observed. Its origin is unknown; it may be a cosmogenic neutrino produced by ultra-high-energy cosmic rays.
The highest estimated energy of any individual neutrino detected by a neutrino telescope.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-HIGHEST-ENERGY-NEUTRINO
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-HIGHEST-ENERGY-NEUTRINO. Highest-energy neutrino ever detected. 2026.