General information
IceCube-260111A is a track-like IceCube Astrotrack BRONZE neutrino alert detected on 2026-01-11 20:10:33.91 UTC with refined coordinates RA 70.88 deg, Dec 34.59 deg (J2000). Follow-up to date reports no significant additional neutrino clustering, no significant gamma-ray excess in Fermi-LAT data, and only optical upper limits from rapid imaging.
Wavelength coverage
- Neutrinos: IceCube detected the alert event; follow-up searches for additional track-like events in ±500 s and over 2 days find no excess (p=1.00 in both windows).
- Gamma-ray (GeV): Fermi-LAT reports no significant (>5σ) new >100 MeV excess within the 90% localization and provides flux upper limits.
- Optical: MASTER-Net rapid observations report only upper limits (to ~19 mag in coadds).
No observations are mentioned for radio, X-ray, UV, IR, or TeV gamma-rays.
Lightcurve and spectrum
Redshift
What’s special vs typical
- A cataloged Fermi-LAT source inside the IceCube 90% region (4FGL J0444.6+3425; associated with blazar B2 0441+34) lies ~0.29 deg from the best-fit position, but it is not significantly detected in the reported LAT time windows.