Table 2: BAT and XRT spectral analysis results of relative to 5 ad hoc selected intervals of the GRB evolution (see bottom panel in Fig. 3). The BAT fluxes in the XRT band are extrapolated from the best fit models. Quoted errors and upper limits are at the 90% confidence level.
Interval Time (s) $N_{\rm H}$ (10²² cm^-2) $\Gamma$ $\chi^2_\nu$ (d.o.f.) Flux (10^-9 erg cm^-2 s^-1)

Start Stop 0.2-10 keV 15-350 keV

BAT A -1.43 23.2 - -1.19 $\pm$ 0.07 0.96 (57) 3.1 52.8

BAT+XRT B 23.2 41.6 7.5 $\pm$ 1.5 -1.37 $\pm$ 0.02 1.0 (189) 2.6 11.9

XRT C 41.6 82.3 4.7 $\pm$ 1.2 -1.63 $\pm$ 0.05 1.19 (205) 1.33 -

XRT D 82.3 224 <2.1 -1.7 $\pm$ 0.1 1.24 (22) 0.03 -

XRT E 628 8163 <2.9 -1.74 $\pm$ 0.07 1.243 (80) 0.006 -

**Table 2:** BAT and XRT spectral analysis results of relative to 5 ad hoc selected intervals of the GRB evolution (see bottom panel in Fig. 3). The BAT fluxes in the XRT band are extrapolated from the best fit models. Quoted errors and upper limits are at the 90% confidence level.
	Interval	Time (s)	$N_{\rm H}$ (10²² cm^-2)	$\Gamma$	$\chi^2_\nu$ (d.o.f.)	Flux (10^-9 erg cm^-2 s^-1)
		Start	Stop				0.2-10 keV	15-350 keV
BAT	A	-1.43	23.2	-	-1.19 $\pm$ 0.07	0.96 (57)	3.1	52.8
BAT+XRT	B	23.2	41.6	7.5 $\pm$ 1.5	-1.37 $\pm$ 0.02	1.0 (189)	2.6	11.9
XRT	C	41.6	82.3	4.7 $\pm$ 1.2	-1.63 $\pm$ 0.05	1.19 (205)	1.33	-
XRT	D	82.3	224	<2.1	-1.7 $\pm$ 0.1	1.24 (22)	0.03	-
XRT	E	628	8163	<2.9	-1.74 $\pm$ 0.07	1.243 (80)	0.006	-

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