Colour composites obtained from the combination of the F606W, F775W, and F850LP HST observing bands. The left image is made from the 11 February data, and the central image from the 28 August data. Right panel: subtraction of both frames, showing that the optical counterpart was still well detected in February. The location of the GRB is indicated with a red circle. The orange lines in the left panel indicate the position of the slits during the two X-shooter observations.