Jet Lorentz factor constraint for GRB 221009A based on the optical depth of the TeV photons
High Energy Physics - Phenomenology
2023-10-04 v1 High Energy Astrophysical Phenomena
Abstract
The recent detection of tera-electronvolt (TeV) photons from the record-breaking gamma-ray burst GRB 221009A during its prompt phase poses challenges for constraining its Lorentz factor. We re-evaluate the constraints on the jet Lorentz factor considering a two-zone model, wherein the TeV photons originate from the external shock region while the lower energy MeV photons come from the internal prompt emission region. By properly accounting for the evolution of the MeV photon spectrum and light curve, we calculate the optical depth for TeV photons and derive a minimum Lorentz factor about 300. It is consistent with the afterglow modeling for the TeV emission.
Keywords
Cite
@article{arxiv.2310.00631,
title = {Jet Lorentz factor constraint for GRB 221009A based on the optical depth of the TeV photons},
author = {Duan-yuan Gao and Yuan-Chuan Zou},
journal= {arXiv preprint arXiv:2310.00631},
year = {2023}
}
Comments
ApJL accepted