Multi-band light curves of SN 2017ati. The dashed vertical line marks the reference epoch, corresponding to the maximum light in the o band. Epochs of our spectroscopic observations are indicated by solid red vertical lines at the top. Upper limits are represented by empty symbols with downward arrows. For clarity, the light curves have been vertically offset by constant values, as indicated in the legend. In most cases, the magnitude uncertainties are smaller than the sizes of the plotted symbols.