Recovery of the X-ray polarisation of Swift J1727.8−1613 after the soft-to-hard spectral transition

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Table 1.

Best-fit spectral parameter values of the joint IXPE spectro-polarimetric fit in XSPEC with Model (1).

Component	Parameter [unit]	Value
`tbabs`	N_H [10²² cm⁻²]	0.24 (frozen)

`diskbb`	kT_in [keV]	0.38 ± 0.04
	norm [10²]	$6_{- 3}^{+ 7}$ $6^{+7}_{-3}$

`powerlaw`	Γ	1.73 ± 0.02
	norm	$0 . 239_{- 0.008}^{+ 0.007}$ $0.239^{+0.007}_{-0.008}$

`const`	factor DU 1	1.0 (frozen)
	factor DU 2	1.037 ± 0.003
	factor DU 3	1.022 ± 0.003

Notes. With Model (2) we obtained the same best-fit values within the uncertainties.

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