Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black hole physics and astrophysics: The GRB-Supernova connection and
  URCA-1 - URCA-2   We outline the confluence of three novel theoretical fields in our modeling
of Gamma-Ray Bursts (GRBs): 1) the ultrarelativistic regime of a shock front
expanding with a Lorentz gamma factor $\sim 300$; 2) the quantum vacuum
polarization process leading to an electron-positron plasma originating the
shock front; and 3) the general relativistic process of energy extraction from
a black hole originating the vacuum polarization process. There are two
different classes of GRBs: the long GRBs and the short GRBs. We here address
the issue of the long GRBs. [...] We are specially interested, in this report,
to a subclass of long GRBs which appear to be accompanied by a supernova
explosion. We are considering two specific examples: GRB980425/SN1998bw and
GRB030329/SN2003dh [...].

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc