Speaker
Description
On February 13, 2023, the KM3NeT collaboration observed KM3-230213A, the most energetic event observed to date, with an estimated energy of ~200 PeV. KM3NeT is a next-generation underwater neutrino telescope under construction in the Mediterranean Sea, which will eventually instrument a cubic kilometer of seawater. Understanding the origin of this event could shed light on the most extreme astrophysical acceleration mechanisms in the Universe. Located at the geographic South Pole, the IceCube Neutrino Observatory is a cubic-kilometer detector embedded in glacial ice. Although IceCube has roughly an order of magnitude more exposure in both livetime and effective area relative to KM3NeT, the highest-energy neutrino events recorded by IceCube reach energies of only ~10 PeV. At the declination of KM3-230213A, IceCube is also more sensitive than KM3NeT to neutrinos with energies from 1 TeV to 1 EeV. This work presents findings from three complementary searches using IceCube data, targeting both steady and time-dependent neutrino emission from the direction and timing of KM3-230213A using both tracks and cascades.
