- Only part of the event data are used in order to have a more reasonable estimation of burst durations. Only use event data before T+700 s. There might be an extended emission out to ~T+160 s, which is picked out by battblocks with the 16-s binned light curve if using all event data. However, we decided to present the result with a T90 without the extended emission part because of the following reasons: (1) battblocks does not pick out this "extended emission" part with light curves with other time bins, (2) battblocks does not find this "extended emission" part if using a lightly different length of event data, (3) no significant detection (i.e., SNR > 3.5) are found in the mosaic image (15-350 keV) from T+50 s to T+100 s (the most obvious part of the extended emission in the SN=5 or 10 s binning plot), and (4) an indipendent analysis from Jay Norris did not find any extended emission. 
- Maybe short GRB with extended emission.