THE TIME-DELAY OF GAMMA-RAY BURSTS IN THE SOFT ENERGY-BAND

Using a cross correlation method, we find that there may exist gamma-r ay bursts whose soft emission has a time delay relative to the high-en ergy emission. Autocorrelation was used to determine the duration of s ubstructures in different energy bands of selected bursts,in order to examine the correlation between time def ay and broadening of soft emi ssion. The results indicate a positive correlation with correlation co efficient 0.75 between the two parameters, this suggests that scatteri ng could partly be the mechanism of time delay and broadening. The har dness ratios of the bursts with time delays are concentrated in a rela tively narrow range.