Discovery of an optical flare from GRB 060926 by the MASTER robotic telescope: Possible formation of a marginally rotating black hole |
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| Authors: | V M Lipunov V G Kornilov E S Gorbovskoy A V Krylov N V Tyurina D A Kuvshinov A A Belinski P A Gritsyk A V Sankovich V V Vladimirov |
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| Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia;(2) LomonosovMoscow State University, Moscow, Russia;(3) Moscow “Optika” Association, Moscow, Russia |
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| Abstract: | 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 7M ⊙ 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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| Keywords: | gamma-ray bursts black holes robotic telescopes gravitational collapse |
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