Multi-wavelength observations of the luminous fast blue optical transient AT 2023fhn - Up to ∼200 days post-explosion

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Table A.3.

AT 2023fhn radio flux densities from our VLA program (SC240143, PI: Chrimes).

Start date	Freq.	Bandwidth	t_exp	Flux Density
JD–2460045	GHz	GHz	min.	μJy/beam
11.80740	1.52	1.024	38	< 130
11.78309	3.00	2.048	32	< 35
11.76507	6.00	4.096	23	< 18
11.74688	10.00	4.096	23	< 18
11.72090	15.08	6.144	35	< 11
11.69229	22.00	8.192	35	< 17
11.66552	33.00	8.192	33	< 25
87.59185	1.52	1.024	39	< 45
87.56657	3.00	2.048	33	110±8
87.54257	6.00	4.096	32	128±5
95.58690	10.00	4.096	31	105±7
95.56438	15.00	6.144	30	71±7
95.52738	22.00	8.192	47	60±10
137.17440	1.52	1.024	39	< 58
137.14178	3.00	2.048	44	110±10
137.10567	6.00	4.096	50	221±5
138.16972	10.00	4.096	42	197±6
138.13664	13.00	2.050	42	180±10
138.13664	15.00	2.050	42	160±10
138.13664	16.96	2.050	42	140±20
249.95139	6.00	4.096	35	< 311^a
249.90997	10.00	4.096	57	< 181^a
249.86861	15.08	6.144	57	< 125^a

Notes. Observation start times are listed with respect to JD–2460045 (12:00 on 10-Apr-2023). The quoted uncertainties do not include the systematic uncertainty of 5% on the absolute flux calibration at these frequencies. Upper limits are given as 3 times the local RMS. ^aThe resolution of the last three observations was lower (as the VLA was in D configuration at the time), so we could not remove contaminating sources at the target location and have consequently listed the upper limit as the flux density at the source location.

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