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GCN Circular 34817

IceCube-231014A - IceCube observation of a high-energy neutrino candidate track-like event
2023-10-14T23:19:35Z (9 months ago)
Marcos Santander at U of Alabama <>
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The IceCube Collaboration ( reports:

On 2023-10-14 at 22:00:06.27 UT IceCube detected a track-like event with a high 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 4.853 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: 2023-10-14
Time:  22:00:06.27 UT
RA: 297.16 (+2.73 / -4.32 deg  90% PSF containment) J2000
Dec: +1.34 (+1.24 / -1.11 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.

Two Fermi 4FGL-DR4 sources are located in the 90% uncertainty region of the event. The sources are 4FGL J1947.0+0031 at RA = 296.76 deg, Dec = +0.52 and 4FGL J1955.7+0214 at RA = 298.94 deg, Dec = +2.24, located 0.91 and 1.99 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

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