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

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 《Astronomy Letters》2008,34(3):145-151

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.  相似文献