Occultation light curves of WASP-43b as observed with GROND. In each panel, shown from top to bottom are the occultation light curves of g′r′i′z′JHK. Left panel: light curves that are normalized by the reference stars. Middle panel: baseline-corrected light curves that are binned every 8 min for display purpose (see Sect. 3.1 for baseline correction). Right panels: best-fit light-curve residuals, also binned every 8 min. Best-fit models for all panels are overlaid in solid or dashed lines. The occultation depth is detected in the K-band (0.197 ± 0.042%) and marginally detected in the i′-band (0.037 %).