Discovery of an optical flare from GRB 060926 by the MASTER robotic telescope: Possible formation of a marginally rotating black hole

Details Discovery of an optical flare from GRB 060926 by the MASTER robotic telescope: Possible formation of a marginally rotating black hole Discovery of an optical flare from GRB 060926 by the MASTER robotic telescope: Possible formation of a marginally rotating black hole

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astl...34..145l&link_type=abstract

Astronomy Letters, Volume 34, Issue 3, pp.145-151

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The MASTER robotic telescope has obtained the first optical images of GRB 060926. We have discovered an optical flare from GRB 060926, a recurrent brightening that closely follows its behavior in the X-ray range. We have determined the spectral slope for GRB 060926 from the X-ray to optical range in the first minutes. Based on the spinar model, we show that the parameters of the optical and X-ray flares suggest that the gamma-ray burst resulted from the core collapse of a 7 M &sun; star with an initial effective Kerr parameter of 7.6 and an initial magnetic-to-gravitational energy ratio of 10-4.

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