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J.W. Keohane (JPL/Caltech), A.S. Reese, D.E. Reichart (UNC)
We model gamma ray burst afterglows, assuming that the progenitor was a massive O type star surrounded by a high pressure HII region, which later became a luminous blue variable, and in turn became a Wolf-Rayet star with a surrounding bubble. We calculate the spectrum and corresponding light curves of synchrotron radiation from a relativistic shock that encounters this density structure. By varying the Wolf-Rayet timescale and wind velocity, we are able to adequately explain a host of GRB phenomena, including the preponderance of constant density GRBs with low densities and fast faders.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.