1999/12/22 by P. Meszaros, Meszaros, P.
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9912475
To appear in Procs. 5th Huntsville Gamma-Ray Burst Symposium, Hunstville, AL, Oct. 18-22, 1999, 5 pages, 2 figures, aipproc.sty
arxiv created 1999/12/22 · arxiv updated 2009/12/01
Steep X-ray spectral slopes, X-ray excesses and preferred spectral energy breaks in the 01-0.3 MeV range are discussed as the possible consequences of the photospheric component of the GRB relativistic outflow, and of pair breakdown in internal shocks leading to comptonization on semirelativistic electrons or MHD waves. We also discuss the X-ray and UV spectra of GRB afterglows occuring in a dense environment characteristic of massive stellar progenitors, including their ability to produce detectable Fe or other metallic line features.