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- W2597004890 abstract "The apparent spectral evolution observed in the steep decay phase of many GRB early X‐ray afterglows raises a great concern of the high‐latitude “curvature effect” interpretation of this phase. However, previous curvature effect models only invoked a simple power law spectrum upon the cessation of the prompt internal emission. We investigate the “curvature effect” model of a more general non‐power‐law spectrum and and test this model with the Swift/XRT observations By comparing the simulated lightcurves/spectra with the observed ones, we show that one can reproduce both the observed lightcurve and the apparent spectral evolution of GRB 050814 using a model invoking a cut‐off power‐law spectrum. This suggests that at least for some GRBs, the fast spectral evolution in the steep‐decay phase can be explained by the curvature effect of a non‐power‐law spectrum." @default.
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- W2597004890 date "2008-01-01" @default.
- W2597004890 modified "2023-10-18" @default.
- W2597004890 title "Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails" @default.
- W2597004890 doi "https://doi.org/10.1063/1.3027905" @default.
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