- Only part of the event data are used in order to have a more reasonable estimation of burst durations. Only include data before T0+100 s for the analysis. This is because when using all of the data, battblocks find a duration of ~ 19 s. However, from the image analyses, the detection is only ~ 2 sigma in the image from T0+5 s to T0+16 s (before slew). The detection in the image from T0+1 s to T0+5 s is ~ 4 sigma, and thus there might be a tail up to ~ T0+5 s. Therefore, we choose to adopt the results using data before T0+100 s, which gives a T100 that is consistent with the image analyses. The lag analysis is inconclusive due to the weakness of the burst (GCN 19148).