Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of an oscillatory phenomenon in optical transient counterpart
  of GRB090522C from observations on Peak Terskol   22 Sep 2005 Swift-BAT triggered and located GRB050922C. The light curve shows
the intense broad peak with $T_{90}$ of $(5 \pm 1)$ s. The Nordic Optical
Telescope has obtained spectra of the afterglow with several absorption
features corresponding to a redshift of $z = 2.17 \pm 0.03$. Observation of
optical transient of GRB050922C was carried out in the R-band with the 60-cm
telescope equipped with a CCD on Peak Terskol (North Caucasus). The OT
magnitude was fading from R $\approx 16$ to $\approx 17.5$. Detection of an
oscillatory phenomenon in the R post-burst light curve is described in this
work. Analysis of the R data reveals coherent harmonic with a period of $0.0050
\pm 0.0003$ days (7.2 min) during observing run of about 0.05 days ($\sim 70$
min). Amplitude of oscillations is about 0.05 magnitude. The simplest model
suggests that GRB050922C may result from tidal disruption of a white dwarf star
by a black hole of about one thousand solar mass. The periodicity in the light
curve can be identified with relativistic precession of an accretion disc.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: math
9
The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn