Notes. We considered six time intervals, each one corresponding to a particular emission feature in the light curve. We fitted the GBM (8 keV–10 MeV) observed emission with a Band model (Band et al. 1993) and a power-law function with an exponential cut-off. In Cols. 2 − 4 we list the Band model low-energy index α, the high-energy β and the break energy , with the reduced chi-square value in the 6th column. In the last three columns are listed the power-law index γ, the cut-off energy and the reduced chi-square value respectively, as obtained from the spectral fit with the cut-off power-law spectral function.