The SED of the afterglow at a mean time of t = 53 ks (Table A.2). The data is corrected for Galactic extinction and underlying host galaxy contribution. The fit is a single power law (χ²/d.o.f. = 0.17). There is no evidence of extinction by dust in the GRB host galaxy (A_V(host) = 0 mag). For the fit, the redshift was fixed to z = 2.61, the Lyman α absorption affects the g′ band slightly. From left to right, we present results for the g′r′i′z′JHK bands.