TITLE: GCN CIRCULAR NUMBER: 36070 SUBJECT: IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 24/04/12 13:28:22 GMT FROM: A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2024-04-12 05:33:46.89 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 Gold alerts is 30%. This alert has an estimated false alarm rate of 3.4096 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/139279_10803235.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2024-04-12 Time: 05:33:46.89 UT RA: 102.44 (+1.09, -0.67 deg 90% PSF containment) J2000 Dec: 6.35 (+0.60, -0.46 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. There are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0658.6+0636 at RA: 104.66 deg and Dec: 6.61 deg (2.2 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/36070. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...