General information
IceCube-260125A is a track-like high-energy neutrino candidate detected by IceCube on 2026-01-25 10:09:39.88 UTC (Astrotrack BRONZE stream) with a refined J2000 position near RA 243.72 deg, Dec 6.69 deg. Follow-up analyses reported no significant coincident neutrino clustering and no convincing electromagnetic counterpart candidates.
Wavelength coverage
- Neutrinos: IceCube alert (track-like) plus searches for additional track-like events in ±500 s and a 2-day window found no excess (p=1.00).
- Gamma-rays (GeV): Fermi-LAT survey data show no significant (>5σ) new excess within the 90% region; flux upper limits were derived assuming a power-law photon index of 2.0.
- Optical: ZTF (Palomar 48-inch) imaged the region in g and r starting ~1.1 hr after T0, covering 100% of the reported localization; no candidate transients were found to a typical depth of ~21 mag.
No reports were provided in X-ray, UV, IR, radio, or gravitational-wave bands.
Lightcurve and spectrum
- Fermi-LAT: assuming a power-law spectrum (photon index 2.0 fixed), 95% CL flux upper limits for >100 MeV are <1.4e-10 ph cm^-2 s^-1 (2008-08-04 to T0), <5.3e-09 ph cm^-2 s^-1 (1-month pre-T0), and <8.8e-08 ph cm^-2 s^-1 (1-day pre-T0).
Redshift
What’s special vs typical