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Time lags in the 0.4-5-Hz quasi-periodic oscillations (QPOs) of the rapid burster are investigated using two Exosat observations. Different QPO modes were noted during long type 2 bursts and in the persistent emission. The 1-5 keV X-ray signal lagged behind the 5-21-keV signal by 7.6 + or - 2.1 ms in the persistent emission QPO with frequencies of greater than 3.6 Hz. The fractional strength of the QPO was found to increase with photon energy during the persistent emission interval. The results provide evidence for a soft lag in QPOs which is suggested to be due to spectral softening during each QPO cycle. 16 references.

Time lags in the quasi-periodic oscillations of the rapid burster (MXB 1730-335)