Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of the 51.47 day orbital period in the supergiant fast X-ray
  transient XTE J1739-302 with INTEGRAL   Timing analysis of ~12.4 Ms of INTEGRAL/IBIS data has revealed a period of
51.47 +/- 0.02 days in the supergiant fast X-ray transient source XTE
J1739-302/IGR J17391-3021 that can be interpreted as an orbital period. An
outburst history showing 35 epochs of activity has been produced, showing X-ray
outbursts throughout the orbit of XTE J1739-302. Possible indications of an
enhanced equatorial density region within the supergiant stellar wind are
present in the phase-folded lightcurve. It is found that many orbital
configurations are possible within this system with eccentricities of up to e
~0.8 valid.

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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: funct-an