On the hadronic origin of the TeV radiation from GRB 190114C

Abstract

The recently discovered TeV emission from Gamma-Ray Bursts (GRBs) has renewed the long-standing discussion about the hadronic versus leptonic origin of the observed GRB radiation. In this work, we investigate the possibility that the very high energy gamma rays observed by MAGIC from GRB 190114C (with energy from ∼0.1 to ∼0.8 TeV) are originated in a hadronic model.We developed a Monte Carlo (MC) simulation of the source internal state dynamics and of the photo-hadronic interactions at internal shock. We included in the simulation also the pair production process that the secondary gamma rays undergo in the GRB jet.We find upper limits on the internal shock model parameters by comparing our simulations to the sub-TeV observations of GRB 190114C.Neutrino flux predictions by the model are found to be consistent with experimental upper limits set by ANTARES and IceCube.