TITLE: GCN CIRCULAR NUMBER: 34817 SUBJECT: IceCube-231014A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 23/10/14 23:19:35 GMT FROM: Marcos Santander at U of Alabama <jmsantander@ua.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2023-10-14 at 22:00:06.27 UT IceCube detected a track-like event with a high 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 4.853 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/138449_20481611.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2023-10-14 Time: 22:00:06.27 UT RA: 297.16 (+2.73 / -4.32 deg 90% PSF containment) J2000 Dec: +1.34 (+1.24 / -1.11 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. Two Fermi 4FGL-DR4 sources are located in the 90% uncertainty region of the event. The sources are 4FGL J1947.0+0031 at RA = 296.76 deg, Dec = +0.52 and 4FGL J1955.7+0214 at RA = 298.94 deg, Dec = +2.24, located 0.91 and 1.99 deg away from the best fit position, respectively. 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/34817. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...