GCN Circular 41731

Subject: IceCube-250905A – IceCube observation of a high-energy neutrino candidate track-like event

Event: IceCube-250905A

Date: 2025-09-05T22:22:56Z

From: Erik Blaufuss at University of Maryland, College Park

The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2025-09-05 20:08:36.01 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 0.41 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. […]

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