- T100, T90, and T50 are lower limits. Looks like the burst went out of the field of view before the burst duration ends (Swift did not slew to the burst due to Sun constraints). 
- Only part of the event data are used in order to have a more reasonable estimation of burst durations. Event data cut to T<T0+100 s. However, the T100 range does not cover the total burst duration because the burst went out of the field of view (at ~T0+140 s).
- The event data are only available for part of the burst duration.
- Spectral analysis is only available for part of the burst duration.