TITLE: GCN CIRCULAR NUMBER: 26802 SUBJECT: IceCube-200117A: IceCube observation of a high-energy neutrino candidate event DATE: 20/01/17 14:15:28 GMT FROM: Cristina Lagunas Gualda at DESY ** *The IceCube Collaboration (http://icecube.wisc.edu/) reports:* * On 20/01/17 at 11:08:29.69UT 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 1.93events 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/133634_1410505.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 20/01/17 Time: 11:08:29.69UT RA: 116.24 (+0.71-1.24  deg 90% PSF containment) J2000 Dec: 29.14  (+0.90-0.78  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. There are no 4FGL sources inside the 90% localization region. The closest source is 4FGL J0746.5+2730 located at RA 116.63 deg and dec 27.52 deg  (at a distance of 1.66 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 *