Top: time series of the GJ 9773 photometry, from LCOGT, TJO, and EYE observatories. Symbols with different colours correspond to different datasets as labelled. The solid black line shows the sinusoidal model that simultaneously best fits all the datasets to the period determined from LCOGT-B, OSN-V and R, and EYE-V datasets. The residuals of this fit are plotted in the bottom panel. Bottom: GLS periodogram of the analysed light curves. Different colours are used to illustrate the periodogram of each dataset, while the solid black lines depict the joint periodogram for LCOGT-B, OSN-V and R, and EYE-V datasets. Solid, dot-dashed, and dotted horizontal grey lines indicate the 10%, 1%, and 0.1% FAP levels for the joint periodogram. The corresponding window function is shown in the top panel of this figure.