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We report the discovery of an anti-correlation between the soft and the hardX-ray lightcurves of the X-ray binary Aql X-1 when bursting. This behavior mayindicate that the corona is cooled by the soft X-ray shower fed by the type-IX-ray bursts, and that this process happens within a few seconds. Stacking theAql X-1 lightcurves of type-I bursts, we find a shortage in the 40--50 keVband, delayed by 4.5$\pm$1.4 s with respect to the soft X-rays. Thephotospheric radius expansion (PRE) bursts are different in that neither ashortage nor an excess shows up in the hard X-ray lightcurve.

The hard X-ray behavior of Aql X-1 during type-I bursts