The shaded bands show the gamma-ray and X-ray light curves of detected GRBs (left) and optical afterglow light curves (right). The central line shows the median flux at the indicated time and the shaded bands include 80% of all GRBs (i.e., the 10% brightest and faintest afterglows are above or below the band, respectively). The arrows show the flux upper limits from the X-ray and optical follow-up observations (see Sects. 4.1 and 4.2 for details).