Detection of an oscillatory phenomenon in optical transient counterpart of GRB090522C from observations on Peak Terskol

Details Detection of an oscillatory phenomenon in optical transient counterpart of GRB090522C from observations on Peak Terskol Detection of an oscillatory phenomenon in optical transient counterpart of GRB090522C from observations on Peak Terskol

2007-10-31

arxiv.org/abs/0711.0038v1

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures, Proceedings of the Conference "Near-Earth Astronomy - 2007", 3-7 September 2007, Terskol settlement, Kab

Scientific paper

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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