Re'em Sari et al 1998 ApJ 497 L17 doi:10.1086/311269
Spectra and Light Curves of Gamma-Ray Burst Afterglows
FREERe'em Sari1, Tsvi Piran1 and Ramesh Narayan2
Show affiliationsThe recently discovered gamma-ray burst afterglow is believed to be described reasonably well by synchrotron emission from a decelerating relativistic shell that collides with an external medium. To compare theoretical models with afterglow observations, we calculate here the broadband spectrum and corresponding light curve of synchrotron radiation from a power-law distribution of electrons in an expanding relativistic shock. Both the spectrum and the light curve consist of several power-law segments with related indices. The light curve is constructed under two limiting models for the hydrodynamic evolution of the shock: fully adiabatic and fully radiative. We give explicit relations between the spectral index and the temporal power-law index. Future observations should be able to distinguish between the possible behaviors and determine the type of solution.
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- Dates
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Issue 1 (1998 April 10)
Received 1997 December 1, accepted for publication 1998 February 9
Published 1998 March 11
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Spectra and Light Curves of Gamma-Ray Burst Afterglows
Re'em Sari et al 1998 ApJ 497 L17
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