TITLE: GCN CIRCULAR NUMBER: 38200 SUBJECT: IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 24/11/13 14:38:33 GMT FROM: A. Zegarelli at Ruhr University Bochum azegarelli@icecube.wisc.edu

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 2024-11-13 00:22:20.68 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 3.8708 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/140078_30891383.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 2024-11-13 Time: 00:22:20.68 UT RA: 196.17 (+0.60, -0.60 deg 90% PSF containment) J2000 Dec: 8.57 (+0.77, -0.83 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.

4FGL J1301.6+0834 (4FGL catalog source) at RA = 195.41 deg and Dec = 8.57 deg is located within the 90% uncertainty region (0.49 deg away from the best-fit position). Additionally, inside the uncertainty region, there is the IceCube neutrino event IC110907A (gold alert, with a 51% probability of being astrophysical) from the IceCat catalog [R. Abbasi et al 2023 ApJS 269 25], located at RA = 196.08 deg, Dec = 9.40 deg (0.83 deg away from the best-fit position of IC241113A here announced, and 1.06 deg away from 4FGL J1301.6+0834).

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

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