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The flux of high-energy astrophysical neutrinos observed by the presentgeneration of neutrino detectors has already indicated a few hints of newphysics beyond the Standard Model. In this work, we show that high-energygamma-ray observations can also be considered as a complementary probe forunveiling the source of high-energy astrophysical neutrino events and newphysics. Recently, the LHAASO collaboration has reported O(5000) gamma-rayevents in the energy range between 0.5 TeV -18 TeV from gamma-ray burstGRB221009A within 2000 seconds after the initial outburst. We showed thatattenuated high-energy gamma rays can be produced from the interaction ofastrophysical neutrinos with CMB neutrinos through non-standardself-interaction of neutrinos mediated by light scalar bosons. The non-standardinteraction of neutrinos recently took a lot of attention in cosmology for itsrole in reducing Hubble tension. We have constrained the parameter space ofnon-standard self-interacting neutrinos from the flux of photons observed byLHAASO and showed consistency of the same with the resulting parameter spacefrom Hubble tension requirements and other recent constraints fromlaboratory/cosmology.

GRB221009A gamma-ray events from non-standard neutrino self-interactions