Massive stars exploding in a He-rich circumstellar medium - XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc, and 2024aej

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Table F.4.

Log of the spectroscopic observations of SN 2023utc.

Date	MJD	Phase^a	Instrumental setup	Grism/Grating	Spectral range	Exposure time	Resolution
		(d)			(Å)	(s)	(Å)
20231023	60240.82	+7.5	ST+KOOLS-IFU	VPH-blue	4000−8550	900	12
20231027	60244.54	+11.2	FTN+FLOYDS	red/blu	3500−10000	3600	16
20231101	60249.57	+16.3	FTN+FLOYDS	red/blu	3500−10000	3600	16
20231112	60260.60	+27.3	FTN+FLOYDS	red/blu	3500−10000	3600	16

^aPhases are relative to r-band maximum light (MJD = 60233.3 $_{- 0.1}^{+ 0.1}$ $^{+\ 0.1}_{-\ 0.1}$ ; 2023-10-16) in observer frame.

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