F. Frontera et al 1998 ApJ 493 L67 doi:10.1086/311132
F. Frontera1,2, E. Costa3, L. Piro3, J. M. Muller4,5, L. Amati3, M. Feroci3, F. Fiore5, G. Pizzichini1, M. Tavani6,7, A. Castro-Tirado8, G. Cusumano9, D. Dal Fiume1, J. Heise4, K. Hurley10, L. Nicastro1, M. Orlandini1, A. Owens11, E. Palazzi1, A. N. Parmar11, J. in't Zand4 and G. Zavattini2
Show affiliationsWe report high-energy spectral data of the prompt emission of GRB 970228 and its X-ray afterglow. We establish that the nature of the X-ray afterglow emission is nonthermal and similar to the later portion of GRB 970228. 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.
gamma rays: bursts; gamma rays: observations; stars: neutron; X-rays: general
Issue 2 (1998 February 1)
Received 1997 August 29, accepted for publication 1997 November 21
Published 1998 January 14
F. Frontera et al 1998 ApJ 493 L67
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