SVOM GRB 250314A at z ≃ 7.3: An exploding star in the era of re-ionization

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Table C.2.

Results of the spectral analysis of the Swift/XRT and Einstein Probe/FXT X-ray follow-up observations.

Instrument	Time	N_H, X	$N_{H, X}^{host} †$ $N^{\mathrm{host}}_{H,X}{\dagger}$	Photon	C-stat/d.o.f.
	since Tb			index
	(ks)	(10²² cm⁻²)		(Γ)	(d.o.f.)
Swift/XRT	5.68	0.19 $_{- 0.17}^{+ 0.22}$ $^{+0.22}_{-0.17}$	-	2.9 $_{- 0.9}^{+ 1.2}$ $^{+1.2}_{-0.9}$	0.99 (39)
	7.38	0.0246	34 $_{- 26}^{+ 49}$ $^{+49}_{-26}$	2.1 ± 0.3	0.91 (39)

EP/FXT	31.97	0.10 $_{- 0.10}^{+ 0.39}$ $^{+0.39}_{-0.10}$	-	2.4 $_{- 1.1}^{+ 2.2}$ $^{+2.2}_{-1.1}$	1.41 (44)
(A+B)	33.16	0.0246	4 $_{- 4}^{+ 22}$ $^{+22}_{-4}$	2.1 $_{- 0.7}^{+ 1.1}$ $^{+1.1}_{-0.7}$	1.41 (44)

XRT/FXT	5.68	< 0.35	-	1.8 $_{- 0.4}^{+ 2.0}$ $^{+2.0}_{-0.4}$	0.51 (78)
(A+B) joint	33.16	0.0246	21 $_{- 18}^{+ 32}$ $^{+32}_{-18}$	2.7 $_{- 0.7}^{+ 0.9}$ $^{+0.9}_{-0.7}$	0.9 (77)

Notes. $N_{H, X}^{Gal}$ $N^{\mathrm{Gal}}_{H,X}$ is extracted from the HI4PI Map (HI4PI Collaboration 2016) at the R.A., Dec. coordinates of the XRT afterglow. ^†: With additional $N_{H, x}^{Gal}$ $N^{Gal}_{H,x}$ fixed at 2.46 × 10²⁰cm⁻² and z = 7.3.

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