Table C.2.

Polarimetry results on SN 2022xgc obtained in the R-band and V-band Bessel filters. ^(a): Stokes parameters, $\overline{Q}$ and $\overline{U}$, directly obtained from the ALFOSC data frames Extraordinary and Ordinary images without applying any further corrections. ^(b): instrumental polarization corrected. ^(c): instrumental polarization corrected and polarization angle corrected. ^(d): instrumental polarization corrected, polarization angle corrected and bias corrected.

Date	Source	filter	${\overline{Q}}^{(\mathrm{a})}$	${\overline{U}}^{(\mathrm{a})}$	P[%](a)	P[%](b, c)	θ[°](c)	Pdeb[%](d)
2022-12-14	HD 14069	R	0.06	0.12	0.13 ± 0.04	–	–	–
2022-12-14	HD 251204	R	-2.53	4.10	4.82 ± 0.03	4.75 ± 0.05	–	–
2022-12-14	SN 2022xgc	R	0.11	-0.07	0.13 ± 0.10	0.19 ± 0.11	46.85 ± 16.75	0.13 ± 0.11
2022-12-14	HD 14069	V	0.02	0.16	0.16 ± 0.06	–	–	–
2022-12-14	HD 251204	V	-3.12	3.89	4.99 ± 0.05	4.87 ± 0.08	–	–
2022-12-14	SN 2022xgc	V	0.13	-0.03	0.14 ± 0.12	0.22 ± 0.14	53.05 ± 17.63	0.13 ± 0.14
2023-01-17	HD 14069	R	0.09	0.06	0.11 ± 0.05	–	–	–
2023-01-17	BD+59 389	R	6.39	1.40	6.55 ± 0.04	6.44 ± 0.06	–	–
2023-01-17	SN 2022xgc	R	0.11	0.16	0.19 ± 0.10	0.10 ± 0.11	132.89 ± 33.47	0.10 ± 0.11
2023-01-17	HD 14069	V	-0.07	0.16	0.17 ± 0.04	–	–	–
2023-01-17	BD+59 389	V	6.23	2.22	6.62 ± 0.08	6.63 ± 0.09	–	–
2023-01-17	SN 2022xgc	V	0.34	0.34	0.48 ± 0.18	0.44 ± 0.18	100.92 ± 11.95	0.37 ± 0.18