Cosmogenic gamma-ray and neutrino fluxes from blazars associated with IceCube events

Blazars constitute the vast majority of extragalactic $\gamma$-ray sources. They can also contribute a sizable fraction diffuse astrophysical neutrinos detected by IceCube. In past few years, real-time alert system IceCube has led to multiwavelength follow-up very high-energy neutrino events plausible origin. Spatial and temporal coincidences these with high-activity state blazars provide unique opportunity decipher cosmic-ray interactions in relativistic jets. Assuming that accelerate cosmic rays up ultrahigh energies ($E>10^{17}$ eV), we calculate "guaranteed" contribution line-of-sight cosmogenic fluxes from four associated events. Detection upcoming imaging telescopes like CTA and/or planned detectors IceCube-Gen2 may lead first direct signature(s) ultrahigh-energy (UHECR) We find detection TXS~0506+056, PKS~1502+106 GB6~J1040+0617 would require UHECR luminosity $\gtrsim 10$ times inferred 3HSP~J095507.9+355101 be if is Given their relatively low redshifts hence total energetics, TXS~0506+056 should prime targets for large telescopes.