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

Abstract

The detection of GRB 180722B and GRB 190114C in sub-TeV gamma-rays has opened up a new window to study gamma-ray bursts in high energy gamma-rays. Recently it is shown that the synchrotron and inverse Compton processes are responsible for the production of these high energy gamma-rays during the afterglow. Here, for the first time we demonstrate that, the photohadronic scenario which is successful in explaining the multi-TeV flaring in high energy blazars is also applicable for gamma-ray bursts. We show that the sub-TeV spectra of GRB 190114C and GRB 180720B are due to the interaction of high energy protons with the background photons in the synchrotron self-Compton region and synchrotron region respectively. The nature of the background photon distributions help us to constraint their bulk Lorentz factors.

7 pages, 2 figures, APJ style, to be published in Astrophysical Journal Letters

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• ANTARES upper limits on the multi-TeV neutrino emission from the GRBs detected by IACTs
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• Bethe-Heitler signature in proton synchrotron models for gamma-ray bursts
• Probing gamma-ray bursts observed at very high energies through their afterglow
• Very high-energy gamma rays from GRB 180720B and GRB 190829A with external Compton emission
• Modelling multiwavelength afterglows of the VHE-GRB population
• TeV afterglow from GRB 221009A: photohadronic origin?
• Constraining the redshift of BL Lac VER J0521+211
• A photohadronic interpretation of the H.E.S.S. afterglow observations from GRB 221009A
• Very High-energy Afterglow Emission of GRB 190829A: Evidence for Its Hadronic Origin?
• The impact of kilonova seed photons on GRB VHE emission