GCN Circular 34933
Subject
IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2023-11-03T14:13:16Z (6 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 23-11-03 at 09:17:35.29 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 Gold alerts is 50%. This alert has an estimated false alarm rate of 0.1472 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/138515_8773328.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 23-11-03
Time: 09:17:35.29 UT
RA: 105.67 (+3.15 / -2.94 deg 90% PSF containment) J2000
Dec: +47.85 (+ 1.95 / -1.78 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.
Several Fermi 4FGL-DR4 sources are located in the 90% uncertainty region of the event. The closest source is 4FGL J0708.9+4839 at RA = 107.25 deg, Dec = +48.66 located 1.32 deg away from the best fit 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