Table 2: Best-fit parameters of the models adopted to describe the X-ray spectrum of Swift J1656.3-3302.
Parameter Value
power law plus Galactic absorption
$\chi^{2}$/d.o.f. 45.6/34
$\Gamma$ $1.28 \pm 0.10$
XRT/IBIS intercalibr. constant 0.7 +0.4-0.2
$F_{\rm (2-10~keV)}$ $4.9 \times 10 ^{-12}$
$F_{\rm (20-100~keV)}$ $1.9 \times 10 ^{-11}$
power law plus Galactic and intrinsic absorption

$\chi^{2}$/d.o.f.		 25.2/33
$N_{\rm H}$ (1022 cm-2) $\rm 6.7^{+3.2}_{-2.7}$
$\Gamma$ $1.64\pm 0.16$
XRT/IBIS intercalibr. constant $\rm 1.9^{+1.3}_{-0.7}$
$F_{\rm (2-10~keV)}$ $4.6\times10^{-12}$
$F_{\rm (20-100~keV)}$ $2.2\times10^{-11}$
broken power law plus Galactic absorption
$\chi^{2}$/d.o.f. 23.6/32
$\Gamma_1$ $\rm0.86^{+0.23}_{-0.26}$
$\Gamma_2$ $\rm 1.81^{+0.23}_{-0.13}$
$E_{\rm break}$ (keV) $\rm 2.7^{+1.5}_{-0.5}$
XRT/IBIS intercalibr. constant $\rm 2.9^{+1.5}_{-1.3}$
$F_{\rm (2-10~keV)}$ $4.4 \times 10^{-12}$
$F_{\rm (20-100~keV)}$ $2.0 \times 10^{-11}$
Note: In the above fits, when needed, we fixed the redshift of the source at z=2.40 and the Galactic hydrogen column at $N_{\rm H}^{\rm Gal} = 2.2 \times 10 ^{21}$ cm-2. The reported fluxes (in the observer's frame) are in erg cm-2 s-1 and are corrected for the total intervening absorption column density. For the broken power law model, the fit parameters are computed in the observer's frame, and not in the source rest frame.

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