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GCN Circular 34933

IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
2023-11-03T14:13:16Z (4 months ago)
Erik Blaufuss at University of Maryland, College Park <>
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The IceCube Collaboration ( 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 (, 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

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