XRT and GROND light curves of GRB 150424A. The shaded areas correspond to the time slices of the snapshot analysis. The dotted lines are the best-fitting smoothly broken power-laws. The X-ray light-curve fit has a reduced χ² = 0.57, the optical light-curve fit has a reduced χ² = 1.04. We fit all bands with more than one detection: g′, r′, i′, z′, J, white, u, uvw2, HST160W, HST125W, and HST606W. All detections and upper limits (not shown in the light curve) are given in Table A.3. The temporal slopes α are given in Table 1.