AAS 203rd Meeting, January 2004
Session 87 HEAD: GRBs and Intermediate Black Holes
Poster, Wednesday, January 7, 2004, 9:20am-6:30pm, Grand Hall

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[87.04] A New Model of Gamma Ray Bursts in Wind-Blown Bubbles

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.