Eruptive mass loss less than a year before the explosion of superluminous supernovae - I. The cases of SN 2020xga and SN 2022xgc

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Table B.2.

SN 2022xgc spectroscopic observations.

UT date	MJD	Phase^a	Telescope +	Exposure	Disperser	Wavelength range
	(days)		Instrument	(s)		(Å)
20221113	59896.0	-4.5	NOT + ALFOSC	3344	Gr#4	3900 – 9600
20221114	59897.8	-3.7	P60 + SEDm	2250	–	3950 – 9200
20221118	59901.3	-0.7	P60 + SEDm	2250	–	3950 – 9200
20221122	59905.0	+2.4	Lick + KAST	3600	600/4310 + 300/7500	3500 – 10500
20221201	59914.8	+9.8	NTT + EFOSC2	900	Gr#13	3650 – 9250
20221214	59927.0	+19.2	NOT + ALFOSC	3600	Gr#4	3900 – 9600
20221207	59930.6	+21.9	VLT + X-shooter	3600	–	3000 – 24800
20221222	59935.7	+25.8	NTT + EFOSC2	2700	Gr#13	3650 – 9250
20230113	59957.8	+42.6	NTT + EFOSC2	2700	Gr#11 + Gr#16	3345 – 9995
20230117	59961.0	+45.1	NOT + ALFOSC	4000	Gr#4	3900 – 9600
20230129	59973.6	+54.7	NTT + EFOSC2	2700	Gr#11	3345 – 7470
20230209	59987.6	+61.3	NTT + EFOSC2	2700	Gr#11 + Gr#16	3345 – 9995
20230212	59987.6	+65.4	VLT + X-shooter	4800	–	3000 – 24800
20230221	59996.7	+72.3	NTT + EFOSC2	2700	Gr#11 + Gr#16	3345 – 9995
20230319	60022.5	+92.1	VLT + X-shooter	3600	–	3000 – 24800

Notes.

^(a)

Rest-frame relative to the rest-frame g-band maximum (MJD 59901.9).

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