High-energy neutrino event IceCube-260821A detected with potential astrophysical origins.

AI Summary

IceCube detected a high-energy neutrino event with a moderate probability of astrophysical origin, localized to RA 116.67 and Dec 10.05. Follow-up gamma-ray observations by Fermi-LAT did not find significant new gamma-ray emission.

Measurements

Notices (1)

IceCube — NEUTRINO · Fri, 21 Aug 2026 03:34:49 GMT

GCN Circulars (3)

GCN-45421 — IceCube-260821A · Sat, 22 Aug 2026 15:55:23 GMT
The Fermi-LAT collaboration reported on the analysis of gamma-ray observations related to the high-energy neutrino event IC260821A detected by IceCube. No significant new gamma-ray emission was found within the 90% confidence localization of the neutrino event, with upper limits on the flux provided for different integration times.

GCN-45419 — IceCube-260821A · Sat, 22 Aug 2026 14:22:58 GMT
The IceCube Neutrino Observatory conducted searches for additional neutrino events related to IceCube-260821A and found no significant excess of track-like events in both a 1000-second and a 2-day time window. The p-values for both searches were 1.00, indicating no detection of additional neutrino events.

GCN-45412 — IceCube-260821A · Fri, 21 Aug 2026 07:23:37 GMT
On August 26, 2021, the IceCube Neutrino Observatory detected a high-energy neutrino candidate event with a moderate probability of astrophysical origin. The event was refined to a specific direction in the sky, with no known gamma-ray sources in the uncertainty region.