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

Abstract

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.

12 pages, 4 figures Accepted for publication in ApJ Letters

References in corpus (6)

• Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
• Shocked by GRB 970228: the afterglow of a cosmological fireball
• The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope
• In-flight performances of the BeppoSAX Gamma-Ray Burst Monitor
• X-ray afterglows from gamma-ray bursts
• 3rd Interplanetary Network Localization, Time History, Fluence, Peak Flux, and Distance Lower Limit of the February 28, 1997 Gamma-Ray Burst

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