of 2) variation in the output of the source.

High resolution analysis of long bursts\[long start result\]
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We compare the time profile of the first seconds of 15 long bursts with the time profiles of 15 short bursts. Fig. \[burst3330 vs burst551\] shows the light curves of a short burst and the first second of a long burst. The time scales of both bursts are quite similar. It is difficult to decide, on the base of these light curves alone, which one belongs to a short burst and which one is a fraction of a long one.

Fig. \[start longs fig\] shows the pulse widths histograms of the beginning of long bursts and of the short bursts. The time scales in both samples are quite similar in the range of 10-200ms. The long bursts have additional pulses in the range of 0.2-1sec. Long bursts contain, of course, longer pulses, but in the sample we considered we demanded that the counts would fall back to the background level within the TTE data. In this way we have limited the pulses width of the long bursts. Both histograms begin at 10-20ms, which is at the limit of the pulse width resolution 