**Table 4:** Spectral fit parameters from *Swift* and *XMM-Newton* data analysis. The columns list the time interval over which the spectra were fit, the column density at the redshift of the host z = 3.967, the photon index, observed flux, unabsorbed flux, $\chi ^2$ and degrees of freedom. The column density for the Swift/XRT data was obtained by fitting the time intervals simultaneously while allowing the photon index to vary. Errors are quoted at the 90% level for each parameter of interest.
Time interval	Column density $N_{\rm H}$	Power-law index	$f_{\rm obs}$	$f_{\rm unabs}$	$\chi ^2$	d.o.f.
(seconds since Trigger)	$\times10^{21}$ cm-²	$\Gamma$	ergs cm^-2 s^-1	ergs cm^-2s^-1
$^\ddag$ 132-232		$1.30\pm 0.07$	$9.7\times 10^{-10}$	$10\times 10^{-10}$	120	92
232-332	$\rm 11.4^{+7.0}_{-7.0}$	$1.7\pm0.13$	$4.4\times10^{-10}$	$5.1\times 10^{-10}$	80.6	58
332-432		$1.50\pm0.09$	$7.3\times 10^{-10}$	$7.9\times 10^{-10}$	107.6	79
432-532		$\rm 1.56^{+0.10}_{-0.13}$	$7.3\times 10^{-10}$	$7.7\times 10^{-10}$	97.9	84
532-632	3.0 $^\dagger$	$1.87\pm0.06$	$4.4\times10^{-10}$	$4.8\times 10^{-10}$	96.5	94
632-790		$1.84\pm0.05$	$4.5\times 10^{-10}$	$4.9\times 10^{-10}$	86.7	95
4-6.6 ks		$1.60\pm{0.05}$	$2.2\times 10^{-10}$	$2.4\times 10^{-10}$	148.6	148
	$\rm 12.2^{+3.5}_{-3.0}$
9.7-12.4 ks		$1.73\pm0.07$	$1.0\times 10^{-10}$	$1.1\times 10^{-10}$	89.9	111
15.5-23.9 ks		$\rm 1.73^{+0.10}_{-0.09}$	$2.4\times 10^{-11}$	$2.8\times 10^{-11}$	34.6	39
27-47 ks	$11.5\pm6.0$	$\rm 1.84^{+0.16}_{-0.13}$	$4.5\times 10^{-12}$	$4.8\times 10^{-12}$	34.1	41
50-140 ks		$1.75\pm0.14$	$4.8\times 10^{-13}$	$5.7\times 10^{-13}$	28	20
$^\S$ 30-56 ks	$\rm 6.7^{+1.9}_{-1.9}$	$1.91\pm0.03$	$3.0\times 10$ ^-12	3.4 $\times$ 10^-12	388.9	401
30-40 ks	$\rm 7.1^{+2.4}_{-2.4}$	$1.87\pm0.04$	$4.1\times 10^{-12}$	$4.6\times 10^{-12}$	256.9	302
40-56 ks	$\rm 5.5^{+3.0}_{-3.0}$	$1.96\pm0.04$	$2.0\times 10^{-12}$	$2.3\times 10^{-12}$	200.2	202

$^\ddag$ Swift epochs; $^\S$ XMM-Newton epochs ; $^\dagger$ 99% confidence Upper limit.