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Determine whether it is a cosmogenic neutrino, emission from a transient point source such as a flaring blazar in the error region, or an upward fluctuation, and which flux is consistent with both detectors. Answer: a joint flux estimate and a source attribution with probabilities.","problem_ref":"f149efadf15a91ad6b3b2192a848c16a13bf4958d536c71b1c88543c694986db","references":"","settled_by":"Joint IceCube-KM3NeT analysis with added exposure, and detection or exclusion of further events above $10^{17}\\,\\mathrm{eV}$.","status_note":"2025: KM3NeT published the event; follow-up analyses found that a steady cosmogenic origin requires a flux in tension with IceCube limits, leaving transient and fluctuation explanations.","title":"Origin of the $220\\,\\mathrm{PeV}$ neutrino event 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