Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 100-month Swift catalogue of supergiant fast X-ray transients I. BAT
  on-board and transient monitor flares   We investigate the characteristics of bright flares for a sample of
supergiant fast X-ray transients and their relation to the orbital phase. We
have retrieved all Swift/BAT Transient Monitor light curves, and collected all
detections in excess of $5\sigma$ from both daily- and orbital-averaged light
curves in the time range of 2005-Feb-12 to 2013-May-31. We also considered all
on-board detections as recorded in the same time span and selected those within
4 arcmin of each source in our sample and in excess of $5\sigma$. We present a
catalogue of over a thousand BAT flares from 11 SFXTs, down to 15-150keV fluxes
of $\sim6\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$ (daily timescale) and
$\sim1.5\times10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (orbital timescale, averaging
$\sim800$s) and spanning 100 months. The great majority of these flares are
unpublished. This population is characterized by short (a few hundred seconds)
and relatively bright (in excess of 100mCrab, 15-50keV) events. In the hard
X-ray, these flares last in general much less than a day. Clustering of hard
X-ray flares can be used to indirectly measure the length of an outburst, even
when the low-level emission is not detected. We construct the distributions of
flares, of their significance (in terms of sigma) and their flux as a function
of orbital phase, to infer the properties of these binary systems. In
particular, we observe a trend of clustering of flares at some phases as
$P_{\rm orb}$ increases, as consistent with a progression from tight, circular
or mildly eccentric orbits at short periods, to wider and more eccentric orbits
at longer orbital periods. Finally, we estimate the expected number of flares
for a given source for our limiting flux and provide the recipe for calculating
them for the limiting flux of future hard X-ray observatories. (Abridged).

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The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: econ