Abstract
We suggest that non‐thermal emission can be produced by multiple scatterings of the photons between the supernova ejecta and pre‐shock material in supernova shock breakout. Such bulk‐Comptonization process may significantly change the original thermal photon spectrum, forming a power‐law non‐thermal component at higher energies. We then show that the luminous X‐ray outburst XRO081009 associated with SN2008D is likely to be such shock breakout emission from an ordinary type Ib/c supernova.
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