Foreground corrected broad-band spectral energy distribution of the afterglow of GRB 080906 with UVOT (open circles) and GROND (filled circles). Upper limits are shown by downward triangles. The SED shows a strong break due to the Lyman-limit being located in the uvw1 band. The photometric redshift is . The inset shows the confidence contours of the redshift solution versus spectral index, where the three-dimensional parameter space has been collapsed onto a two-dimensional z − β grid. Lines and shadings are the same as in Fig. 7.