TITLE:   GCN CIRCULAR
NUMBER:  37723
SUBJECT: IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
DATE:    24/10/06 23:52:54 GMT
FROM:    A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 2024-10-06 at 22:38:14.30 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 2.56 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/139939_8268246.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 2024-10-06
Time:  22:38:14.30 UT
RA: 58.36 (+0.94, -0.84 deg 90% PSF containment) J2000
Dec: +8.35 (+0.47, -0.49 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-DR4 or 3FHL catalog sources within the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0347.5+0722 at RA: 56.90 deg, Dec: +7.38 deg J2000 (1.74 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