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Table 1.

Liverpool-Maidanak monitoring of QSO 2237+0305 in 2006–2019.

Band Total frames Selected frames (a) Epochs/nights Tframe(b) (s) Tnight(c) (s) FWHM(d) (″)
g 277 260 203 253 318 1.54 ± 0.16
V 731 695 180 290 1124 1.26 ± 0.14
r 366 328 253 200 255 1.46 ± 0.15
R 2295 2192 445 260 1290 1.25 ± 0.15
I 705 678 179 200 758 1.17 ± 0.13

Notes.

(a)

Number of individual frames after removing those with relatively poor quality. The removed frames produce anomalous photometric results and account for 4–10% of the total in each optical band.

(b)

Average exposure time per individual frame.

(c)

Average exposure time per night.

(d)

Mean value and standard deviation of the full width at half-maximum (FWHM) of the seeing disc.

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