Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel paradigm for short gamma-ray bursts with extended X-ray emission   The merger of a binary of neutron stars provides natural explanations for
many of the features of short gamma-ray bursts (SGRBs), such as the generation
of a hot torus orbiting a rapidly rotating black hole, which can then build a
magnetic jet and provide the energy reservoir to launch a relativistic outflow.
Yet, this scenario has problems explaining the recently discovered long-term
and sustained X-ray emission associated with the afterglows of a subclass of
SGRBs. We propose a new model that explains how an X-ray afterglow can be
sustained by the product of the merger and how the X-ray emission is produced
before the corresponding emission in the gamma-band, although it is observed to
follow it. Overall, our paradigm combines in a novel manner a number of
well-established features of the emission in SGRBs and results from
simulations. Because it involves the propagation of an ultra-relativistic
outflow and its interaction with a confining medium, the paradigm also
highlights a unifying phenomenology between short and long GRBs.

37
The categories of this paper are: supr-con
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
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph