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We present a detailed multi-frequency analysis of an intense monitoringprogramme of Seyfert 1 galaxy NGC 4593 over a duration of nearly for a monthwith Swift observatory. We used 185 pointings to study the variability in sixultraviolet/optical and two soft (0.3-1.5 keV) and hard X-ray (1.5-10 keV)bands. The amplitude of the observed variability is found to decrease from highenergy to low energy (X-ray to optical) bands. Count-count plots ofultraviolet/optical bands with hard X-rays clearly suggest the presence of amixture of two major components: (i) highly variable component such as hardX-ray emission and (ii) slowly varying disc-like component. The variationsobserved in the ultraviolet/optical emission are strongly correlated with thehard X-ray band. Cross-correlation analysis provides the lags for the longerwavelengths compared to the hard X-rays. Such lags clearly suggest that thechanges in the ultraviolet/optical bands follow the variations in the hardX-ray band. This implies the observed variation in longer wavelengths is due toX-ray reprocessing. Though, the measured lag spectrum (lag vs. wavelength) iswell described by {\lambda}^(4/3) as expected from the standard disc model, theobserved lags are found to be longer than the predicted values from standarddisc model. This implies that the actual size of the disc of NGC 4593 is largerthan the estimated size of standard thin disc as reported in AGN such as NGC5548, Fairall 9.

Correlated X-ray/UV/optical emission and short term variability in a Seyfert 1 galaxy NGC 4593