http://arxiv.org/abs/1911.01558
Synchrotron radiation from a decelerating blast-wave is a widely accepted model of optical to X-ray afterglow emission from gamma-ray bursts (GRBs). GeV gamma-ray emission detected by the Fermi Large Area Telescope (LAT) and the duration of which extends beyond the prompt gamma-ray emission phase, is also compatible with broad features of afterglow emission. There is, however, limitations of the simplest version of this pure electron-synchrotron model to explain high-energy photons detected late from the GRB as well as multiwavelength spectral and temporal features. We have developed a synchrotron self-Compton (SSC) emission model from a decelerating blast-wave and applied it, together with the synchrotron emission model, to fit multiwavelength data from a few bright GRBs detected by the Fermi-LAT. We have explored and derived constraints on the SSC model parameters from fits to the broadband spectra and light curves for the fast- and slow-cooling regimes of electrons in the blast-wave. The results are presented for the long GRB 130427A and short GRB 090510, together with predicted flux in the very-high energy (VHE, $\gtrsim 30$GeV) range for the current and upcoming ground-based Cherenkov telescopes.
J. Joshi and S. Razzaque
Wed, 6 Nov 19
40/57
Comments: 15 pages, 5 figures, comments are welcome
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