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Spectral Properties of the Prompt X-ray emission and Afterglow from the Gamma-Ray Burst of 28 February 1997

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arxiv astro-ph/9711279 v1 pith:I5MAKJZR submitted 1997-11-24 astro-ph

Spectral Properties of the Prompt X-ray emission and Afterglow from the Gamma-Ray Burst of 28 February 1997

classification astro-ph
keywords emissionafterglowx-raydatagrb970228modelspromptspectral
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report high-energy spectral data of the prompt emission of GRB970228 and its X-ray afterglow. We establish that the nature of the X-ray afterglow emission is non-thermal and similar to the later portion of GRB970228. Our data can be used to discriminate different emission models of GRB afterglows. While cooling of excited compact objects can be ruled out, fireball models are constrained in the physics of the radiation emission processes and their evolution.

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