Fig. A.3
X-ray to optical spectral energy distribution of the afterglow of GRB 090426 at t = 8 ks after the burst, calculated based on the fitted light curve (Fig. 4). The fit uses 
× 1022 cm-2 and corresponds to a negligible host extinction, a gas column density of 
× 1022 cm-2, and a spectral slope of βOX = 0.90 ± 0.03 (χ2 = 10.85 with 7 d.o.f., χν = 1.55).
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