Table 3: Spectral fitting parameters in the 18-120 keV energy range (uncertainties at 90% level).
$1{\rm st}$ week $2{\rm nd}$ week $3{\rm rd}$ week

(rev. 633) (rev. 635) (rev. 637)

Photon index $1.77 \pm 0.07$ $1.87 \pm 0.09$ $1.80 \pm 0.07$

Flux (20-40 keV) $173 \pm 5$ $144 \pm 5$ $169 \pm 5$

10^-12 erg cm $^{-2}~\rm s^{-1}$

**Table 3:** Spectral fitting parameters in the 18-120 keV energy range (uncertainties at 90% level).
	$1{\rm st}$ week	$2{\rm nd}$ week	$3{\rm rd}$ week
	(rev. 633)	(rev. 635)	(rev. 637)
Photon index	$1.77 \pm 0.07$	$1.87 \pm 0.09$	$1.80 \pm 0.07$
Flux (20-40 keV)	$173 \pm 5$	$144 \pm 5$	$169 \pm 5$
10^-12 erg cm $^{-2}~\rm s^{-1}$

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