Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding the spectral and timing behavior of a newly discovered
  transient X-ray pulsar Swift J0243.6+6124   We present the results obtained from timing and spectral studies of the newly
discovered accreting X-ray binary pulsar Swift J0243.6+6124 using a NuSTAR
observation in 2017 October at a flux level of ~280 mCrab. Pulsations at
9.85423(5) s were detected in the X-ray light curves of the pulsar. Pulse
profiles of the pulsar were found to be strongly energy dependent. A broad
profile at lower energies was found to evolve into a double peaked profile in
$\ge$30keV. The 3-79 keV continuum spectrum of the pulsar was well described
with a negative and positive exponential cutoff or high energy cutoff power law
models modified with a hot blackbody at $\sim$3 keV. An iron emission line was
also detected at 6.4 keV in the source spectrum. We did not find any signature
of cyclotron absorption line in our study. Results obtained from phase-resolved
and time-resolved spectroscopy are discussed in the paper.

31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat