Light curve (left panel) and HID (right panel) extracted from NICER (top) and Swift-XRT (bottom). Count rates were calculated in the 0.5–10 keV energy range, while hardness ratios were derived considering the 0.5–3 and 3–10 keV energy bands for both instruments. The colour gradient indicates the temporal sequence. Vertical dashed lines in the left panels denote the epoch of the NuSTAR observation.