Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails

Details Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails

2008-08-27

arxiv.org/abs/0808.3793v2

2009, ApJ, 690, L10-L13

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, 1 table, . Accepted for publication in ApJ Letters

Scientific paper

10.1088/0004-637X/690/1/L10

The apparent spectral evolution observed in the steep decay phase of many GRB early 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 a model that invokes the "curvature effect" of a more general non-power-law spectrum and test this model with the Swift/XRT data of some GRBs. We show that one can reproduce both the observed lightcurve and the apparent spectral evolution of several GRBs using a model invoking a power-law spectrum with an exponential cut off. GRB 050814 is presented as an example.

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