The broad-lined type Ic supernova 2020lao experienced an energetic explosion with no central-engine signatures

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Table A.1.

Journal of spectroscopic observations.

Date	JD 2,400,000	Phase^a	Telescope^b	Instrument	Grating	Exp. (s)
Optical
2020 May 26.2	58995.69	+2.0	GTC^c	OSIRIS	R1000B,R	800
2020 May 27.1	58996.64	+2.9	GTC	OSIRIS	R1000B,R	700
2020 May 27.9	58996.99	+3.7	NOT	ALFOSC	Gr4	2100
2020 May 29.5	58999.00	+5.2	Faulkes	Floyds	Red, Blue	2400
2020 May 30.2	58999.65	+5.8	NOT	ALFOSC	Gr4	2100
2020 May 31.0	59000.46	+6.6	LT	Sprat	VPH	500
2020 June 1.5	59002.01	+8.1	Faulkes^d	Floyds	Red, Blue	3600
2020 June 5.3	59005.80	+11.8	APO	DIS	Red, Blue	2100
2020 June 6.9	59007.44	+13.4	NOT	ALFOSC	Gr4	2100
2020 June 19.0	59019.90	+25.0	LT	Sprat	VPH	1200
2020 June 21.0	59021.54	+27.0	NOT	ALFOSC	Gr4	900
2020 July 6.0	59036.51	+41.5	NOT	ALFOSC	Gr4	3600
2020 August 4.0	59067.50	+71.5	GTC	OSIRIS	R1000B	2×1500
2020 August 31.1	59092.69	+95.9	GTC	OSIRIS	R1000B,R	785

NIR

2020 June 15.4	59015.87	+21.5	IRTF	SpeX	Prism	1357

Notes. ^(a)Rest-frame days past t_exp. ^(b)GTC is the 10.4-m Gran Telescopio Canarias, NOT is the 2.56-m Nordic Optical Telescope, Faulkes is the Las Cumbres Observatory’s 2-m telescope, LT is the 2-m Liverpool Telescope, APO is the 3.5-m Apache Point Observatory telescope, and IRTF is the 3.2-m NASA Infrared Telescope Facility. ^(c)Spectrum as reported by Galbany et al. (2025). ^(d)Classification spectrum from the Transient Name Server as reported by Burke et al. (2020).

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