Light curves for the secondary eclipse of WASP-33b for the night I (left panels) and night II (right panels). Top panels: the light curves of WASP-33 normalised with those of the reference star, overplotted is the best fitting “full” model with a low order polynomial baseline correction, stellar pulsations and the eclipse. Middle panels: the light curves corrected for the trends in the baseline and stellar pulsations, clearly showing the transit. Bottom panels: the residuals after subtracting the best-fit model. The thick points with errorbars in these figures show the data binned by 50 points. The vertical dashed lines show the expected times for first to fourth contact.