Physics - Cosmology and Nongalactic Astrophysics Physics - High Energy Astrophysical Phenomena
2023 ApJS 269 25 We present a catalog of likely astrophysical neutrino track-like events from
the IceCube Neutrino Observatory. IceCube began reporting likely astrophysical
neutrinos in 2016 and this system was updated in 2019. The catalog presented
here includes events that were reported in real-time since 2019, as well as
events identified in archival data samples starting from 2011. We report 275
neutrino events from two selection channels as the first entries in the
catalog, the IceCube Event Catalog of Alert Tracks, which will see ongoing
extensions with additional alerts. The gold and bronze alert channels
respectively provide neutrino candidates with 50\% and 30\% probability of
being astrophysical, on average assuming an astrophysical neutrino power law
energy spectral index of 2.19. For each neutrino alert, we provide the
reconstructed energy, direction, false alarm rate, probability of being
astrophysical in origin, and likelihood contours describing the spatial
uncertainty in the alert's reconstructed location. We also investigate a
directional correlation of these neutrino events with gamma-ray and X-ray
catalogs including 4FGL, 3HWC, TeVCat and Swift-BAT.