Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectra and Light Curves of Gamma-Ray Burst Afterglows   The recently discovered GRB afterglow is believed to be described reasonably
well by synchrotron emission from a slowing down relativistic shell that
collides with an external medium. To compare theoretical models with afterglow
observations we calculate here the broad band 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. The light curve is constructed under two limiting
models for the hydrodynamical evolution of the shock: fully adiabatic and fully
radiative. We compare the results with observations of $\gamma$-ray burst
afterglows.

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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: math-ph