Observed multi-wavelength light curve of GRB 140515A. We report the best fits for the optical (blue) and X-rays (grey) band. The orange line shows the possible decay of the late-time X-ray afterglow, assuming a possible jet break. Inset: the time interval of the X-ray bump on a linear scale. Red curves represent three independent flaring episodes. This is discussed further in Sect. 4.1 and Fig. 7.