GCN Circular 42909
Subject
IceCube-251130A - IceCube observation of a high-energy neutrino candidate track-like event
Event
Date
2025-11-30T19:37:39Z (2 days ago)
From
A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 25-11-30 at 17:53:30.69 UT IceCube detected a track-like event with a high probability of being of astrophysical origin.
The event was selected by the ICECUBE_Astrotrack_GOLD alert stream.
The average astrophysical neutrino purity for Gold alerts is 50%.
This alert has an estimated false alarm rate of 1.1099 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/141654_31953389.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 25-11-30
Time: 17:53:30.69 UT
RA: 229.7 (+0.53/-0.52 deg 90% PSF containment) J2000
Dec: -5.53 (+0.58/-0.6 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