Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X-ray Source SLX 1732-304 in the Globular Cluster Terzan 1: The
  Spectral States and an X-ray Burst   The results of ART-P/Granat observations of the X-ray burster SLX1732-304 in
the globular cluster Terzan 1 are presented. The X-ray (3-20 keV) fluxes from
the source differed by more than a factor of 4 during the observing sessions on
September 8 ($F_{\rm X}\simeq6.95\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$) and
October 6, 1990 ($F_{\rm X}\simeq1.64\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$).
The intensity variations of SLX1732-304 were apparently accompanied by
variations in its hardness: whereas the source in its high state had the
spectrum with a distinct exponential cutoff typical of bright low-mass X-ray
binaries, its low-state spectrum could be satisfactorily described by a simple
power law with a photon index $\alpha\simeq1.7$. During the ART-P observation
on September 8, a type I X-ray burst was detected from SLX1732-304.

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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph