GCN Circular 43374
Subject
IceCube-260111A - IceCube observation of a high-energy neutrino candidate track-like event
Event
Date
2026-01-11T22:48:41Z (3 days ago)
From
Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 26-01-11 at 20:10:33.91 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin.
The event was selected by the ICECUBE_Astrotrack_BRONZE alert stream.
The average astrophysical neutrino purity for Bronze alerts is 30%.
This alert has an estimated false alarm rate of 0.7434 events per year due to atmospheric
backgrounds.
The IceCube detector was in a normal operating state at the time of detection.
After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/141893_3811884.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 26-01-11
Time: 20:10:33.91 UT
RA: 70.88 (+1.55/-1.4 deg 90% PSF containment) J2000
Dec: 34.59 (+0.76/-0.64 deg 90% PSF containment) J2000
One gamma-ray source from the Fermi 4FGL-DR4 catalog is located within the 90% uncertainty region of this event: 4FGL J0444.6+3425, at RA = 71.16° and Dec = 34.42° (J2000), with an angular separation of 0.29° from the best-fit event position.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica.
The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu