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GCN Circular 20119

IceCube-161103: IceCube observation of a very-high-energy neutrino
2016-11-03T14:40:56Z (8 years ago)
Ignacio Taboada at Georgia Inst of Tech <>
Ignacio Taboada (Georgia Institute of Technology) reports on behalf of the IceCube Collaboration (

On 2016/11/03 IceCube detected a track-like very-high-energy event with a high probability of being of astrophysical origin. The event was a High Energy Starting Event (HESE). The IceCube detector was in a normal operating state. HESE events have a neutrino vertex inside of the detector (to reduce background) and have a high light level (a proxy for energy).

After the initial automated alert (, more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 2016/11/03
Time: 09:07:31.12 UT
RA: 40.83 deg (+1.10 -0.70 deg 90% PSF containment) J2000
Dec: 12.56 deg (+1.10 -0.65 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.

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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