Table 4: Best-fit results for the simultaneous spectral fit of the three epochs (see text for details). We report the values obtained for the nominal Crab cross-calibration factor of ISGRI ( $C_{\rm ISGRI}=0.99$), and for $C_{\rm ISGRI}=0.89$ and $C_{\rm ISGRI}=1.09$. $N_{\rm Pex}$ and $N_{\rm Bkp}$ are the normalization factors for the PEXRAV and broken power law models respectively (reported as photon flux at 1 keV in units of $10^{-3} ~\rm ph/cm^2/s/keV$). $\ \ \ ^*$ error obtained fixing the PEXRAV normalization.
  $C_{\rm ISGRI}=0.99$ $C_{\rm ISGRI}=0.89$ $C_{\rm ISGRI}=1.09$
  (nominal from Crab)    
$N_{\rm Pex}$ ( $10^{-3} ~\rm ph/cm^2/s/keV$) $13.3 \pm 5.0$ ($\pm $0)* $19.4 \pm 5.3$ $7.9 \pm 4.7$
$N_{\rm Bkp}$ for rev. 633 ( $10^{-3} \rm\ ph/cm^2/s/keV$) $27.1 \pm 9.3$ ($\pm 5.1$)* $20.3 \pm 9.5$ $33.8 \pm 9.3$
$N_{\rm Bkp}$ for rev. 635 ( $10^{-3} \rm\ ph/cm^2/s/keV$) $19.5 \pm 7.9$ ($\pm 3.8$)* $13.5 \pm 7.8$ $25.7 \pm 8.0$
$N_{\rm Bkp}$ for rev. 637 ( $10^{-3} \rm\ ph/cm^2/s/keV$) $25.4 \pm 8.6$ ($\pm 4.7$)* $18.7 \pm 8.7$ $32.0 \pm 8.6$
photon index 1 $1.46 \pm 0.12$ ($\pm $0.10)* $1.38 \pm 0.15$ $1.51 \pm 0.10$
photon index 2 $1.71 \pm 0.05$ ($\pm $0.04)* $1.66 \pm 0.05$ $1.75 \pm 0.04$
break Energy (keV) $4. \pm 2.$ ($\pm $2.)* $4. \pm 2.$ $4. \pm 2.$
XRT cross-calib $1.01 \pm 0.11$ ($\pm $0.11)* $1.02 \pm 0.11$ $0.98 \pm 0.11$
$\chi^2/\rm d.o.f.$ 38.0/45 40.7/45 36.4/45
null hypothesis probability 0.76 0.65 0.82


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