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GCN Circular 33244

Subject
IceCube-230201A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2023-02-01T12:49:02Z (a year ago)
From
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 2023-02-01 at 06:20:54.42 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 2.07 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/137603_30799022.amon) more 
sophisticated reconstruction algorithms have been applied offline, with 
the direction refined to:

Date: 2023-02-01
Time:  06:20:54.42 UT
RA: 345.41 (+2.50/-3.07 deg 90% PSF containment) J2000
Dec: +12.10 (+1.62/-1.53 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.

Three gamma-ray sources listed in the 4FGL Fermi-LAT catalog are located 
within the 90% containment region. The sources are 4FGL J2256.7+1307, 
4FGL J2308.9+1111 and 4FGL J2252.6+1245, located 1.6, 2.0 and 2.3 deg 
away from the best-fit position, respectively.

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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