Table 1: Best-fit spectral parameters for the two segments of the XRT observation (WT and PC data), fitted both separately and together. We report the results either leaving the hydrogen column density as a free parameter, or freezing it to the Galactic value.
$N_{\rm H}$ (10²¹ cm^-2) $\Gamma$ $\chi^2_\nu$ ( $\chi^2/$ d.o.f.)

XRT (WT) $\rm 1.3^{+0.7}_{-0.6}$ $\rm 1.92^{+0.27}_{-0.24}$ 1.10 (29.7/27)

XRT (PC) $\rm 1.4^{+0.8}_{-0.7}$ $\rm 2.00^{+0.38}_{-0.31}$ 1.05 (12.6/12)

XRT (WT+PC) $\rm 1.4^{+0.6}_{-0.5}$ $\rm 1.95^{+0.21}_{-0.21}$ 1.10 (42.0/38)

XRT (WT) 0.46 (frozen) $1.58\pm0.12$ 1.22 (34.1/28)

XRT (PC) 0.46 (frozen) $1.58\pm0.14$ 1.41 (19.1/13)

XRT (WT+PC) 0.46 (frozen) $1.61\pm0.10$ 1.20 (47.0/39)

**Table 1:** Best-fit spectral parameters for the two segments of the XRT observation (WT and PC data), fitted both separately and together. We report the results either leaving the hydrogen column density as a free parameter, or freezing it to the Galactic value.
	$N_{\rm H}$ (10²¹ cm^-2)	$\Gamma$	$\chi^2_\nu$ ( $\chi^2/$ d.o.f.)
XRT (WT)	$\rm 1.3^{+0.7}_{-0.6}$	$\rm 1.92^{+0.27}_{-0.24}$	1.10 (29.7/27)
XRT (PC)	$\rm 1.4^{+0.8}_{-0.7}$	$\rm 2.00^{+0.38}_{-0.31}$	1.05 (12.6/12)
XRT (WT+PC)	$\rm 1.4^{+0.6}_{-0.5}$	$\rm 1.95^{+0.21}_{-0.21}$	1.10 (42.0/38)
XRT (WT)	0.46 (frozen)	$1.58\pm0.12$	1.22 (34.1/28)
XRT (PC)	0.46 (frozen)	$1.58\pm0.14$	1.41 (19.1/13)
XRT (WT+PC)	0.46 (frozen)	$1.61\pm0.10$	1.20 (47.0/39)

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