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The detection of GRB 180722B and GRB 190114C in sub-TeV gamma-rays has openedup a new window to study gamma-ray bursts in high energy gamma-rays. Recentlyit is shown that the synchrotron and inverse Compton processes are responsiblefor the production of these high energy gamma-rays during the afterglow. Here,for the first time we demonstrate that, the photohadronic scenario which issuccessful in explaining the multi-TeV flaring in high energy blazars is alsoapplicable for gamma-ray bursts. We show that the sub-TeV spectra of GRB190114C and GRB 180720B are due to the interaction of high energy protons withthe background photons in the synchrotron self-Compton region and synchrotronregion respectively. The nature of the background photon distributions help usto constraint their bulk Lorentz factors.

Origin of sub-TeV afterglow emission from gamma-ray bursts GRB 190114C and GRB 180720B