Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Implications of Recent Observational Discoveries for the Nature and
  Origin of Gamma-Ray Bursts   The discoveries that GRBs have X-ray, optical and radio afterglows have
connected the study of GRBs to the rest of astronomy, and revolutionized the
field. In this review, I discuss the implications that the observation of these
afterglows have for burst energies and luminosities, and for models of the
bursts and their afterglows. I describe recent evidence linking the long,
softer, smoother GRBs detected by BeppoSAX and core collapse supernovae.
Finally, I summarize recent work showing that, if these GRBs are due to the
collapse of massive stars, they may provide a powerful probe of the very high
redshift universe.

27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex