  The gamma-ray burst's lightcurves have been analyzed using a special wavelet
transformation. The applied wavelet base is based on a typical Fast
Rise-Exponential Decay (FRED) pulse. The shape of the wavelet coefficients'
total distribution is determined on the observational frequency grid. Our
analysis indicates that the pulses in the long bursts' high energy channel
lightcurves are more FRED-like than the lower ones, independently from the
actual physical time-scale.

Astrophysics