TITLE: GCN CIRCULAR NUMBER: 32980 SUBJECT: IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/11/24 16:39:15 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 22-11-24 at 15:46:02.26 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 2.79 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/137296_24212476.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 22-11-24 Time: 15:46:02.26 RA: 298.92 (+2.65/-2.92 deg 90% PSF containment) J2000 Dec: +3.73 (+1.04/-1.23 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. One gamma-ray source listed in the 4FGL Fermi-LAT catalog is located in the 90% uncertainty contour. The source is 4FGL J1956.1+0234 located at RA=299.04 deg, Dec=2.57 deg (J2000 coordinates), 1.16 deg away from the best fit 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