Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Multi Messenger and Gravitational Wave (MM&GW)
VHE gamma-rays from the hyper-bright GRB 221009A: implications for external inverse-Compton and proton synchrotron emission
B.T. Zhang*, K. Murase, K. Ioka, D. Song, C. Yuan and P. Meszaros
*: corresponding author
Full text: pdf
Pre-published on: August 18, 2023
Published on: September 27, 2024
Abstract
The detection of the hyper-bright gamma-ray burst (GRB) 221009A provides an opportunity to investigate the nature of GRB emission and the origin of very-high-energy (VHE) gamma-rays. In this study, we examine the GeV-TeV emission within the framework of the external reverse-forward shock model.
We observe that the external inverse-Compton mechanism, involving the upscattering of MeV gamma-rays by electrons accelerated at the external shock, is crucial in explaining the early emission in the range of approximately 1-200 GeV. This mechanism complements the synchrotron self-Compton component.
Our results indicate the detectability of proton synchrotron emission from accelerated ultra-high-energy cosmic rays (UHECRs) and suggest that it could potentially account for the detection of photons at the $\mathcal{O}(10\rm~TeV)$ level by LHAASO. Additionally, these findings may offer insights into constraining the mechanism responsible for UHECR acceleration.
DOI: https://doi.org/10.22323/1.444.1460
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