KM3-230213A

KM3-230213A is an energetic neutrino detected by KM3NeT neutrino observatory in 2023, with an estimated energy of 220 PeV, more than an order-of-magnitude more than any other detection, making it of high research interest. Existing neutrino survey data suggests this is way out of line with expected random neutrinos; presuming the detection is genuine, this has led to modeling of what kind of event might have produced its speed.

Cosmic-ray particles have been detected with more energy (e.g., the 1991 Oh-My-God Particle, with 3200 PeV), but not astrophysical neutrinos.