Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Afterglow calculation in the electromagnetic model for gamma-ray bursts   We compute the afterglow of gamma-ray bursts produced by purely
electromagnetic outflows to see if it shows characteristic signatures differing
from those obtained with the standard internal/external shock model. Using a
simple approach for the injection of electromagnetic energy to the forward
shock we obtain the afterglow evolution both during the period of activity of
the central source and after. Our method equally applies to a variable source.
Afterglow light curves in the visible and X-ray bands are computed both for a
uniform medium and a stellar wind environment. They are brighter at early times
than afterglows obtained with the internal/external shock model but relying
only on these differences to discriminate between models is not sufficient.

25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys