(> 1 TeV) and have propagated through large distances, they make a great probe for overabundances of the cosmic neutrino background.
The propagation of neutrinos from NGC1068 was simulated by solving a transport equation, which takes into account the SM neutrino-neutrino interactions. The final fluxes produced are then analysed using publicly released IceCube data. Our preliminary results indicate that IceCube is able to improve the current bounds on a relic neutrino overabundance by 3 orders of magnitude compared to current experimental bounds, i.e. to less than ~ 10^9 cm^-3 at the 2 sigma confidence level.