IceCube-170922A multimessenger association 2026-10-18
The 2018 collaboration paper associated the 22 September 2017 neutrino alert with the flaring blazar TXS 0506+056 through directional and multiwavelength observations. Its approximately evidence included trial corrections and assumed relationships between neutrino and gamma ray emission. A single association did not establish a production mechanism or explain the entire diffuse neutrino flux.[ref]
Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A by IceCube Collaboration and others. The neutrino alert; Neutrino-blazar coincidence analysis; Discussion, PDF pp. 2–3, 11–13, 62–66
TXS 0506+056 Created 2026-10-18 Updated 2026-11-05
TXS 0506+056 is a blazar studied through a gamma-ray flare associated in direction and time with the high-energy neutrino alert IceCube-170922A. The event motivated coordinated observations across the electromagnetic spectrum, connecting a variable relativistic source with a possible source of energetic neutrinos.[ref]
Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A by IceCube Collaboration and others. Abstract: alert, directional/temporal association and follow-up observations
An association is a statistical inference involving localization, timing and backgrounds. It does not directly image the neutrino-production site or uniquely determine the jet's particle composition. The physical interpretation must account for the measured photons and neutrino evidence together.