Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A semi-analytic afterglow with thermal electrons and synchrotron
  self-Compton emission   We extend previous work on gamma-ray burst (GRB) afterglows involving hot
thermal electrons at the base of a shock-accelerated tail. Using a
physically-motivated electron distribution based on first-principles
simulations, we compute broadband emission from radio to TeV gamma-rays. For
the first time, we present the effects of a thermal distribution of electrons
on synchrotron self-Compton (SSC) emission. The presence of thermal electrons
causes temporal and spectral structure across the entire observable afterglow,
which is substantively different from models that assume a pure power-law
distribution for the electrons. We show that early-time TeV emission is
enhanced by more than an order of magnitude for our fiducial parameters, with a
time-varying spectral index that does not occur for a pure power law of
electrons. We further show that the X-ray "closure relations" take a very
different, also time-dependent, form when thermal electrons are present; the
shape traced out by the X-ray afterglows is a qualitative match to observations
of the traditional decay phase.

37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph