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

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Table A.1.

Details of all Chandra observations of AT 2023fhn from program 24500143 (PI: Chrimes).

ObsID	Start date	t_exp	Data mode	F_X
	JD-2460045	ks		erg s⁻¹ cm⁻²
26624	14.78957	29.68	FAINT	$({7.6}_{- 1.8}^{+ 2.2})$ $(7.6^{+2.2}_{-1.8})$
26625	27.98310	29.68	FAINT	$\begin{matrix} \end{matrix}} (4.5)_{- 2.9}^{+ 4.7}) \times 10^{- 16}$ $\left. \begin{array}{c}\ \\ \ \end{array}\right\} (4.5)^{+4.7}_{-2.9}) \times 10^{-16}$
27833	29.47145	29.67	FAINT
26626	61.80356	16.88	VFAINT	$\begin{matrix} , \end{matrix}} < 8.2 \times 10^{- 16}$ $\left.\begin{array}{c} \,\\ \,\\ \,\\\,\\ \,\\,\,\end{array}\right\} \lt 8.2 \times 10^{-16}$
27895	62.33516	10.94	VFAINT
27835	65.12251	13.89	FAINT
27905	65.45429	13.89	FAINT
27906	65.79704	13.89	FAINT
27907	66.13969	13.89	FAINT
26627	198.66317	10.74	VFAINT	$\begin{matrix} \end{matrix}} < 3.5 \times 10^{- 16}$ $\left.\begin{array}{c} \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \\ \, \end{array}\right\} \lt 3.5 \times 10^{-16}$
28997	198.96634	10.74	VFAINT
28998	199.27127	11.12	VFAINT
27837	205.89744	13.4	VFAINT
29031	206.23509	13.3	VFAINT
29032	206.57170	13.5	VFAINT
29034	207.96147	10.93	VFAINT
29033	208.26639	14.39	VFAINT
27838	215.80840	16.85	VFAINT
29054	216.19957	17.84	VFAINT
29056	216.60163	14.39	VFAINT
28991	218.76822	9.94	VFAINT
28999	219.12318	18.69	VFAINT
29055	219.54352	16.85	VFAINT

Notes. ObsID, exposure start times (since JD-2460045) and data mode are listed. All observations are made with ACIS-S. The fluxes F_X are unabsorbed and measured in the energy range 0.5-7.0 keV. Individual observations in each of the four epochs are merged as indicated. Uncertainties are given at 1σ, upper limits at 2σ.

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