IceCube detects high-energy neutrino track event with 61% astrophysical probability

AI Summary

IceCube detected a track-like muon neutrino event (IceCube-261012A) on 2026-10-12 at 16:58:11.46 UTC with an estimated neutrino energy of 242.25 GeV and a false alarm rate of 2.42e-8 (p_astro = 0.6095), indicating a 61% probability of astrophysical origin. The event was localized to RA = 177.71° ± 0.45° and Dec = 8.95° ± 0.45° (90% containment). Follow-up observations by Fermi-LAT detected no significant gamma-ray counterpart within the localization region, and IceCube's search for additional neutrino events in 1000-second and 2-day windows yielded no excess activity (p-value = 1.00), suggesting an isolated neutrino event rather than an ongoing source.

Measurements

Notices (1)

IceCube — NEUTRINO · Mon, 12 Oct 2026 16:58:11 GMT

GCN Circulars (3)

GCN-45946 — IceCube-261012A · Tue, 13 Oct 2026 20:48:08 GMT
IceCube performed a search for additional neutrino events around the time of IceCube-261012A but found no significant excess, indicating no additional neutrino activity. The sensitivity of IceCube to neutrino point sources was reported, with a p-value of 1.00 in both 1000-second and 2-day time windows.

GCN-45941 — IceCube-261012A · Tue, 13 Oct 2026 13:30:05 GMT
The Fermi-LAT collaboration reported no significant gamma-ray emission associated with the high-energy neutrino event IC261012A detected by IceCube, setting upper limits on the flux. Regular monitoring of the source will continue due to Fermi's all-sky scanning mode.

GCN-45929 — IceCube-261012A · Mon, 12 Oct 2026 21:47:11 GMT
On October 26, 2012, the IceCube Neutrino Observatory detected a high-energy neutrino event with a high probability of being of astrophysical origin. The event, designated IceCube-261012A, was detected at 16:58:11.46 UT and has an estimated false alarm rate of 0.7647 events per year due to atmospheric backgrounds.