A Test of the Hadronic Origin of γ-Rays from Blazars with Follow-up up to a Month Later of IceCube Alerts with Imaging Air Cherenkov Telescopes

The sources of IceCube neutrinos are as yet unknown. multimessenger observation their emission in γ-rays can be a guide to identification, exemplified by the case TXS 0506+056. We suggest new method searching for with Imaging Air Cherenkov Telescopes from coinciding possible astrophysical neutrinos. propose that searches extended current practice only few days up one month neutrino alert. test this strategy on simulated modeled after blazar 0506+056, emitting and via photohadronic interactions: subsequently reprocessed VHE range. Using MAGIC benchmark example, we show should able detect γ-ray counterparts alerts rate approximately per year. It has been proposed high-energy diffuse flux explained ∼5% all blazars flaring once every 10 yr, luminosity similar 0506+056 during 2014–2015 flare. implementation our could lead, over timescale or years, either detection subclass contributing constraint model.