IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
Abstract
On 2022-04-21 at 05:20:18.26 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 2.281 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/136556_43687362.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2022-04-21 Time: 05:20:18.26 UT RA: 113.64 (+3.17, -2.74 deg 90% PSF containment) J2000 Dec: 5.83 (+2.18, -1.69 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-DR3 Fermi-LAT catalog is located within the 90% containment region for the event: the source 4FGL J0733.8+0455 (RA: 113.47 deg, Dec: 4.93 deg J2000), 0.92 deg from the best-fit neutrino candidate 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
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2022
- Bibcode:
- 2022GCN.31931....1I