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GCN Circular 32980

Subject
IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2022-11-24T16:39:15Z (a year ago)
From
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 22-11-24 at 15:46:02.26 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 2.79 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/137296_24212476.amon), more 
sophisticated reconstruction algorithms have been applied offline, with 
the direction refined to:

Date: 22-11-24
Time: 15:46:02.26
RA: 298.92 (+2.65/-2.92 deg  90% PSF containment) J2000
Dec: +3.73 (+1.04/-1.23 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 Fermi-LAT catalog is located in 
the 90% uncertainty contour. The source is 4FGL J1956.1+0234 located at 
RA=299.04 deg, Dec=2.57 deg (J2000 coordinates), 1.16 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
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