Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy emission of GRB 130427A: evidence for inverse Compton
  radiation   A nearby super-luminous burst GRB 130427A was simultaneously detected by six
$\gamma$-ray space telescopes ({\it Swift}, Fermi-GBM/LAT, Konus-Wind,
SPI-ACS/INTEGRAL, AGILE and RHESSI) and by three RAPTOR full-sky persistent
monitors. The isotropic $\gamma-$ray energy release is of $\sim 10^{54}$ erg,
rendering it the most powerful explosion among the GRBs with a redshift $z\leq
0.5$. The emission above 100 MeV lasted about one day and four photons are at
energies greater than 40 GeV. We show that the count rate of 100 MeV-100 GeV
emission may be mainly accounted for by the forward shock synchrotron radiation
and the inverse Compton radiation likely dominates at GeV-TeV energies. In
particular, an inverse Compton radiation origin is established for the $\sim
(95.3,~47.3,~41.4,~38.5,~32)$ GeV photons arriving at $t\sim
(243,~256.3,~610.6,~3409.8,~34366.2)$ s after the trigger of Fermi-GBM.
Interestingly, the external-inverse-Compton-scattering of the prompt emission
(the second episode, i.e., $t\sim 120-260$ s) by the forward-shock-accelerated
electrons is expected to produce a few $\gamma-$rays at energies above 10 GeV,
while five were detected in the same time interval. A possible unified model
for the prompt soft $\gamma-$ray, optical and GeV emission of GRB 130427A, GRB
080319B and GRB 090902B is outlined. Implication of the null detection of $>1$
TeV neutrinos from GRB 130427A by IceCube is discussed.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat