Light curves of GRB afterglows in the different bands (see Table 2 for a definition of the bands). Coloured dots indicate detections, while gray triangles are 3σ detection limits. Observations of an individual burst are connected by a thick coloured line in case of detections and a thin dotted line in case of detection limits. GRBs with only one observation are shown as individual symbols with no connecting lines. Detections of GRB 010222 in bands 6 and 7 are due to the host galaxy and not the afterglow. The detection of XT 080109 in band 6 is due to the host galaxy.