GCN Circular 43239
Subject
IceCube-251225A - IceCube observation of a high-energy neutrino candidate track-like event
Event
Date
2025-12-25T22:27:35Z (7 hours ago)
From
Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 25-12-25 at 20:14:06.80 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 1.0705 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/141764_19814286.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 25-12-25
Time: 20:14:06.80 UT
RA: 297.42 (+0.54/-0.49 deg 90% PSF containment) J2000
Dec: 22.47 (+0.46/-0.48 deg 90% PSF containment) J2000
We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.
No known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of the event.
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