0.5–7 keV light curves for each FXRT candidate: full exposure, in units of counts (first column 1); zoomed-in view, from the detection of the first photon to the end of the exposure, in units of count rate (cts s⁻¹), with log-log scaling and five counts per bin (second column); long-term light curve, with each point representing individual Chandra exposures (cyan circles with 1σ error bars) to highlight the significance of detections and non-detections, in units of counts (third column); long-term light curve, with each point representing individual Chandra (cyan), XMM-Newton (red), and Swift-XRT (green) exposures in units of flux (erg s⁻¹ cm⁻²) (fourth column). For the long-term light curves, the observation that includes the transient is denoted by a large blue star (1σ error bars), while triangles denote observations with (3σ) upper limits. All the fluxes are reported in the 0.5–7 keV band in the observer’s frame. In the case of FXRT 4 in Col. 4, additional data points are partially blocked by the blue star.