- T100, T90, and T50 might be lower limits. There might be a precursur at ~ T0-110 s. Also, the burst went out of the field of view at ~T0+120 s due to observational constraint (GCN 12551), it looks like there might be another pulse at the end of the available event data. Since it is hard to tell whether there are indeed a precursor or another pulse at later time, we use the T100 determined by battblocks for spectral analysis.