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Abstract: On 13th February 2023, the KM3NeT neutrino telescope detected the most energetic neutrino candidate event ever observed, with a median neutrino energy of 220 PeV, and a 90% confidence interval from 72 PeV to 2.6 EeV. The discovery of a neutrino with such a high energy is a new milestone in neutrino astrophysics. KM3NeT is a neutrino telescope in the Mediterranean Sea still under construction. It consists of two sites: ARCA, in front of the coast of Sicily, and ORCA, offshore Toulon, with strong involvement of the CPPM KM3NeT group. While ORCA is optimised for neutrinos in the GeV energy regime, ARCA detects best neutrinos fom sub-TeV energies up to few PeV. KM3-230213A was observed by ARCA and at the time of the detection, 21 detection lines were in operation. Dedicated studies were performed to estimate the energy and the direction of the event. Its near horizontal direction make it highly improbable that KM3-230213A could be a background muon event, and the extreme energy makes it almost certainly being of astrophysical origin. However, the exact astrophysical origin remains uncertain. While it is very likely not produced within the Milky Way, several potential blazar counterparts exist within the directional uncertainty region, and other scenarios such as a cosmogenic origin are feasible too. In this seminar talk I will go into the details of the discovery of this extraordinary neutrino event as well as its potential origin.
