UVOT light curves of TUVO-21acq. Upper panel: long-term light curve, created using all UVOT data covering the position of the source in all three UV filters. Data from optical filters are not shown for aesthetic purposes, as very few images were obtained in these filters and only weak upper limits were found (i.e. no detections). Lower panels: zoomed-in views of the two outburst segments that are labelled in the top panel. Horizontal lines indicate the quiescence level (see Sect. 2.3.1). Triangles indicate upper limits (indicating that the source was not detected at ≥3σ).