Abstract

We have studied the morphology of the prompt emission of 36 long gamma-ray bursts with redshifts, well determined spectra by the Band model and 64 msec resolution light curves whose peak counts are 10 times larger than background fluctuations. We parametrize the morphology by the absolute deviation from their constant luminosity (ADCL) and find a clear gap in the distribution, which divides LGRBs into two subclasses: small-ADCL events (<0.17) and large ones (>0.17). We find that two subclasses are apparently separated in the spectral peak energy (Ep) - the peak luminosity (Lp) diagram. The Ep - Lp correlations both for small and large ADCL events are much tighter than the one for the whole events.

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