Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Emergence and Discovery of Hot Spots in Supernova Remnant 1987A   We present the discovery of several new regions of interaction between the
ejecta and equatorial circumstellar ring of SN1987A, an interaction leading to
a much expanded development of the supernova remnant. We also trace the
development of the first such "hot spot," discovered in 1997, back to 1995.
Later hot spots seem to have emerged by early 1999. We discuss mechanisms for
the long delay between the first and later spots.

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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
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The categories of this paper are: math-ph