GCN Circular 34276
Subject
IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2023-07-27T20:09:11Z (10 months ago)
From
Erik Blaufuss at University of Maryland, College Park <blaufuss@umd.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2023-07-27 at 16:05:39.63 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 3.384 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/138198_44334860.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2023-07-27
Time: 16:05:39.63 UT
RA: 33.66 (+1.16, -0.77 deg 90% PSF containment) J2000
Dec: 7.63 (+0.70, -0.64 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-DR3 or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0219.5+0724 at RA: 34.89 deg, Dec: 7.41 deg (1.25 deg away from the best-fit alert 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