  The Seyfert galaxy NGC 6814 is a highly variable X-ray source despite the
fact that it has recently been shown not to be the source of periodic
variability. The 1.5 year monitoring by ROSAT has revealed a long term downward
trend of the X-ray flux and an episode of high and rapidly varying flux (e.g.
by a factor of about 3 in 8 hours) during the October 1992 PSPC observation.
Temporal analysis of this data using both Fourier and autoregressive techniques
have shown that the variability timescales are larger than a few hundred
seconds. The behavior at higher frequencies can be described by white noise.
