Abstract
Recent multiwavelength observations of gamma-ray burst afterglows observed in the TeV energy range challenge the simplest synchrotron self-Compton (SSC) interpretation of this emission and are consistent with a single power-law component spanning over 8 orders of magnitude in energy. To interpret this generic behavior in the single-zone approximation without adding further free parameters, we perform an exhaustive parameter space study using the public, time-dependent, multimessenger transport software AM 3 . This description accounts for the radiation from nonthermal protons and the leptohadronic cascade induced by pp and p γ interactions. We summarise the main scenarios that we have found (SSC, Extended-syn, Proton-syn, pp-cascade, and pγ-cascade) and discuss their advantages and limitations. We find that possible high-density environments, as may be typical for surrounding molecular cloud material, offer an alternative explanation for producing flat hard (source) spectra up to and beyond energies of 10 TeV.
Published Version
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