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GCN Circular 33161

Subject
IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2023-01-12T12:55:28Z (a year ago)
From
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 2023-01-12 at 06:44:50.60 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 4.05 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/137537_52990531.amon), more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:

Date: 2023-01-12
Time:  06:44:50.60 UT
RA: 24.35 (+1.43/-1.71 deg  90% PSF containment) J2000
Dec: +0.90 (+0.63/-1.26 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 or 3FHL catalog sources in the 90% uncertainty
region. The nearest gamma-ray source in either catalog is 4FGL
J0135.1+0255 at RA: 23.78 deg, Dec: 2.92 deg (2.10 deg away from the
best-fit event 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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