TITLE: GCN CIRCULAR NUMBER: 43421 SUBJECT: IceCube-260115A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 26/01/15 20:05:03 GMT FROM: A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 26-01-15 at 17:32:35.71 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 2.0497 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/141917_80302474.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 26-01-15 Time: 17:32:35.71 UT RA: 145.77 (+2.29/-1.77 deg 90% PSF containment) J2000 Dec: 12.41 (+1.18/-0.91 deg 90% PSF containment) J2000 As announced in GCN Circular 43419 (https://gcn.nasa.gov/circulars/43419), the probability distribution of the true neutrino direction, allowing the extraction of precise 90% containment regions around the best-fit direction, is now available. The corresponding link (for this alert https://roc-2.icecube.wisc.edu/public/alerts/IceCube-260115A_skymap_probdens...) is provided through the GCN schema distributed via Kafka. IceCube GCN notices for high-energy track alerts (Gold and Bronze) are now also distributed via Kafka and can be accessed through the Kafka topic 'gcn.notices.icecube.gold_bronze_track_alerts'. Further details will be available soon at https://gcn.nasa.gov/missions/icecube. Please note that the classical GCN stream will be deactivated in the near future. No known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of this event. 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/43421. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...