RGB-colour image of the host galaxy of GRB 180728A, obtained from i′,r′ g′ images. Bluer regions correspond primarily to g′-band emission. The top panels show the individual g′ r′ i′ z′ GROND imaging. The nearby star (red circle) was removed using a point spread function model, although some residual is left. The magenta circle shows the position of the afterglow/SN. The dashed circle has a radius of 1$\stackrel{″}{.}$5 and shows the region used for aperture photometry. North is up, east is left.