- Only part of the event data are used in order to have a more reasonable estimation of burst durations. Only use event data with T<T0+100 s. This is because there seems to be some very weak tail out to ~T+100 s, but the significance is so low that it doesn't look real. An image from T0+20 s to T0+100 s shows a 3.1 sigam detection, and an image from T0+40 s to T0+100 s shows a 2.2 sigma detection. Therefore, we thinkg the tail is from noise fluctuation, and cut the data till T0+100 s so that battblocks will not pick out the tail. 
# single-ish pulse GRB.