Optical light curve for ATLAS17aeu. Filled points identify our data, while empty symbols are data from the literature. The power-law decay of the optical afterglow (blue dotted line) and the SN 1998bw (grey open triangles) template at z = 0.5 are shown. The overall fit to the light curve, assuming SN 1998bw as a template (fainter by 0.2 mag) is shown (blue dashed line). The overall fit is then shifted arbitrarily to guide the eye and match the g-band (green dashed line) and i-band (red dashed line) data.