  We present a discovery and observation of an extraordinarily bright prompt
optical emission of the GRB 060117 obtained by a wide-field camera atop the
robotic telescope FRAM of the Pierre Auger Observatory from 2 to 10 minutes
after the GRB.
  We found rapid average temporal flux decay of alpha = -1.7 +/- 0.1 and a peak
brightness R = 10.1 mag.
  We interpret the shape of the lightcurve as a transition between reverse and
forward shock emission.
