GCN Circular 32013
Subject
IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2022-05-09T20:15:22Z (3 years ago)
From
Erik Blaufuss at U. Maryland/IceCube <blaufuss@umd.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2022-05-09 at 18:19:04.12 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The average astrophysical neutrino purity for Bronze alerts is 50%. This alert has an estimated false alarm rate of 1.53 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/136615_14688828.amon), more
sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2022-05-09
Time: 18:19:04.12 UT
RA: 334.25 (+2.01, -1.44 deg 90% PSF containment) J2000
Dec: 5.38 (+1.63, -1.65 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 2 known gamma-ray sources in the 90% containment region for the event. The sources are 4FGL J2215.4+0544 and 4FGL J2212.8+0647. The closest source in the 4FGL-DR3 Fermi-LAT catalog is 4FGL J2215.4+0544 (333.86 deg, 5.75 deg J2000, 0.54 deg away 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