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GCN Circular 27719

Subject
IceCube-200512A: IceCube observation of a high-energy neutrino candidate event
Date
2020-05-12T10:58:22Z (4 years ago)
From
Cristina Lagunas Gualda at DESY <cristina.lagunas@desy.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 20/05/12 at 07:31:27.76 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 2.61 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/134081_58268464.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 20/05/12 
Time: 07:31:27.76 UT
RA: 295.18 (+1.72 -2.26 deg 90% PSF containment) J2000
Dec: 15.79 (+1.26 -1.29 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 4FGL sources inside the 90% localization region. The closest source is 4FGL J1947.1+1729 located at RA 296.78 deg and dec 17.49 deg  (at a distance of 2.28 degrees from the best-fit location).

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
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