  A new procedure for smoothing a gamma-ray burst (GRB) lightcurve and
calculating its variability is presented. Applying the procedure to a sample of
25 long GRBs, we have obtained a very tight correlation between the variability
and the peak luminosity. The only significant outlier in the sample is GRB
030329. With this outlier excluded, the data scatter is reduced by a factor of
\sim 3 compared to that of Guidorzi et al. (2005), measured by the deviation of
fit. Possible causes for the outlier are discussed.
