TITLE: GCN CIRCULAR NUMBER: 32909 SUBJECT: IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/11/04 12:42:30 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum lincetto@astro.rub.de
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2022-11-04 at 06:10:08.18 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 2.63 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/137217_75180896.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2022-11-04 Time: 06:10:08.18 UT RA: 209.62 (+0.74/-0.92 deg 90% PSF containment) J2000 Dec: +15.09 (+0.79/-0.80 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 J1403.7+1513 at RA: 210.94 deg, Dec: 15.23 deg (1.28 deg away from the best-fit event 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