IceCube-211216A - IceCube observation of a high-energy neutrino candidate track-like event
Abstract
On 2021-12-16 at 07:07:38.13 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 2.37 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/136055_348073.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2021-12-16 Time: 07:07:38.13 RA: 316.05 (+2.58/-1.95 deg 90% PSF containment) J2000 Dec: 15.79 (+1.29/-1.63 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 gamma-ray sources listed in the 4FGL Fermi-LAT catalog are located in the 90% containment region. The sources are 4FGL J2100.0+1445 at RA: 315.02 deg, Dec: 14.76 deg (1.43 deg away from the best-fit event position) and 4FGL J2108.5+1434 at RA: 317.15, Dec: 14.58 (1.61 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
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2021
- Bibcode:
- 2021GCN.31241....1I