X-Ray Afterglows from Gamma-Ray Bursts
نویسنده
چکیده
We consider possible interpretations of the recently detected X-ray afterglow from the gamma-ray burst source GRB 970228. Cosmological and Galactic models of gamma-ray bursts predict different flux and spectral evolution of X-ray afterglows. We show that models based on adiabatic expansion of relativistic forward shocks require very efficient particle energization or post-burst re-acceleration during the expansion. Cooling neutron star models predict a very distinctive spectral and flux evolution that can be tested in current X-ray data. Subject Headings: gamma rays: bursts, theory; X-rays: general March 14, 1997 Submitted to the Astrophysical Journal Letters: March 18, 1997
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