Fig. 3
Swift/XRT (Evans et al. 2007) to optical/NIR (GROND) spectral energy distribution of the afterglow of GRB 090510 at t = 31 ks after the burst. The inset shows the βopt vs. 
plane, constraining their corresponding error bars. Filled triangles refer to the GROND-observed NIR upper limits (J = 22.2, H = 21.6, and Ks = 21.0), filled circles to the observed optical magnitudes (g′,r′,i′,z′).
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