Top: background-subtracted EPIC-MOS1, MOS2, and pn light curves of eRASSt J040515.6 − 745202 in the energy band 0.2–8.0 keV with time bins of 50 s. Time zero corresponds to 2021 May 14 00:39:53 UT. The red dashed line marks the average count rate obtained from the full EPIC-pn light curve. Bottom: zoom-in showing the X-ray burst with a time binning of 4 s. The light curves for MOS1 and MOS2 were summed up to gain statistics. Time zero corresponds to the burst onset (start of first bin with a significantly increased count rate).