High-energy neutrino detected by IceCube with no associated gamma-ray emission.

AI Summary

IceCube detected a high-energy neutrino event (IceCube-260825A) on August 25, 2026, but subsequent searches for gamma-rays and additional neutrinos yielded no significant findings.

Measurements

Notices (1)

IceCube — NEUTRINO · Tue, 25 Aug 2026 10:53:33 GMT

GCN Circulars (5)

GCN-45471 — IceCube-260825A · Sun, 30 Aug 2026 16:21:25 GMT
The Fermi-LAT collaboration reported on the analysis of gamma-ray observations following the detection of a high-energy neutrino event, IC260825A, by IceCube. No significant 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-45462 — IceCube-260825A · Sat, 29 Aug 2026 06:13:33 GMT
IceCube performed a search for additional neutrino events related to IceCube-260825A and found zero track-like events within the 90% containment region. The p-value of 1.00 in a 1000-second window indicates no significant excess of events, and a subsequent 2-day search also showed no significant excess with a p-value of 0.03.

GCN-45461 — IceCube-260825A · Sat, 29 Aug 2026 06:13:01 GMT
IceCube performed a search for additional neutrino events related to IceCube-260825A and found zero track-like events within the 90% containment region during a 1000-second window. A subsequent search over 2 days also showed no significant excess of track events.

GCN-45446 — IceCube-260825A · Wed, 26 Aug 2026 15:21:41 GMT
The Zwicky Transient Facility (ZTF) observed the region of the neutrino event IceCube-260825A but found no transient candidates. The observations covered 81.2% of the localization region with a depth of 21.0 mag, and no potential counterparts were detected.

GCN-45438 — IceCube-260825A · Tue, 25 Aug 2026 12:35:54 GMT
On 26-08-25, the IceCube Neutrino Observatory detected a high-energy neutrino candidate event with a moderate probability of astrophysical origin. The event was refined to a direction with RA 91.95 and Dec 45.73, and no known gamma-ray sources from the Fermi LAT 16-year Source List are within the 90% uncertainty region.