Table 2: Spectral fit results.
Spectrum Photon index $N_{\rm H}$ $\chi^{2}_{\rm red}$ (d.o.f.) C-stat (%)a Start time End time
    (1020 cm-2)     (s since T0) (s since T0)
BAT total $\rm 2.63_{-0.36}^{+0.42}$ ... 1.4 (56) ... -2.560 4.160
BAT T90 $\rm 2.64_{-0.38}^{+0.46}$ ... 1.3 (56) ... -2.432 3.648
BAT T50 $\rm 2.65_{-0.48}^{+0.61}$ ... 1.0 (56) ... -0.064 2.048
BAT peak $\rm 2.65_{-0.60}^{+0.82}$ ... 0.9 (56) ... 0.064 1.024
XRT  WT $\rm 2.11_{-0.28}^{+0.31}$ 2.8b 1.0 (6) ... 92 596
XRT WT+PC  $\rm 2.12_{-0.23}^{+0.25}$ 2.8b 1.0 (8) ... 92 599
XRT  PC  $\rm 2.13_{-0.19}^{+0.44}$ 2.8b ... 220.7 (58.0) 99 599
XRT  PCc $\rm 2.06_{-0.24}^{+0.24}$ 2.8b ... 270.7 (67.1) 599 18308
a Cash statistic (C-stat) and percentage of Monte Carlo realizations that had statistic < C-stat. We performed 104 simulations.
b Fixed to the Galactic value.
c Snapshots 1 through 4, with the exclusion of the first $\sim $600 s (non piled-up data).

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