X-ray to optical SED at 0.03, 0.1, 0.24 and 1.5 days. The last two epochs are well modelled by a joint-fit with a single power law with spectral slope β ∼ 0.7. In the first two epochs, the optical data have a slightly shallower spectral slope, β_opt ∼ 0.6, while the X-ray data do not and require a break that moves from 2.1 to 2.6 keV (with β_X = β_opt + 0.5). The solid line is the unextinguished and unabsorbed model. The dashed line represents the extinguished and absorbed model, dominated by the Galactic foreground extinction in the optical/NIR bands and absorption in the X-rays.