Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of Millisecond Variability in the Neutron-Star X-Ray Transient
  SAX J1750.8-2900   We report the discovery of millisecond oscillations in the X-ray emission
from the X-ray transient SAX J1750.8-2900. Millisecond quasiperiodic
oscillations (kHz QPOs) were present in the persistent emission with
frequencies ranging from 543 Hz to 1017 Hz. Oscillations at a frequency of
600.75 Hz were present in the brightest X-ray burst observed. We derive an
upper limit on the source distance of 6.3 +/- 0.7 kpc from this X-ray burst.

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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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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: nlin
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
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The categories of this paper are: chem-ph