Comparisons between analytic and numerical calculations of GRB spectra

Computer Science

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Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Jets And Bursts, Galactic Winds And Fountains, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Formulas of Sari, Piran, and Narayan for the spectral energy distributions of gamma-ray burst blast waves are extended to include synchrotron self-absorption and Compton scattering and, given a simple numerical integration, to apply to general radiative regimes. The expressions are compared with detailed numerical simulation results and are most accurate (within a factor of ~3) in the optical/X-ray regime during the afterglow phase. Comparison of spectral energy distributions are made for the parameters used by Wijers and Galama to fit GRB 970508. .

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