  We report a search for pulsations in 147 Type 1 X-ray bursts observed with
EXOSAT in 10 X-ray burst sources. Instead of treating each burst separately, we
incoherently averaged the power spectra of all of the bursts of a given burster
to improve statistics. No periodicities were detected; 99% confidence upper
limits on the modulation depths of possible periodic signals with frequencies
between 1 and 2048 Hz range from 2 to 20% depending on source and frequency
range.
