The approach to Gaussianity of the output

of a narrow-band system

is investigated. It is assumed that the input

is an

-dependent process, in the sense that the random variables

and

are independent for

. With

and

the distribution functions of

and of a suitable normal process, a realistic bound

on the difference

is determined, and it is shown that

as the bandwidth

of the system tends to zero. In the special case of the shot noise process begin{equation} y(t) = sum_i h(t - t_i) end{equation} it is shown that begin{equation} mid F(y) - G(y) mid < (omega_o/lambda) frac{1}{2} end{equation} where

is the average density of the Poisson points

.