Lightcurves obtained from the Swift /XRT monitoring campaign performed a few days before and after the XMM-Newton and NuSTAR observations of IGR J17544-2619 (we mark in black the lightcurve in the 0.5−10 keV energy range, in red the lightcurve in the 0.5−2.5 keV energy range, and in green the lightcurve in the 2.5−10 keV energy range). The time is measured from the 57 102 MJD, as in Fig. 1. The faint flare recorded by XRT, which is visible above when the source count-rate reaches approximately 0.17 cts s^-1, occurred on 57 103.7 MJD, that is, roughly one day after the onset of the much brighter outburst observed by XMM-Newton and NuSTAR. The downward arrows indicate 3σ upper limits on the source count-rate when IGR J17544-2619 was not detected in the corresponding XRT observation. We also marked with vertical solid lines the time interval of the XMM-Newton observation (the NuSTAR observation is nearly simultaneous). The vertical, dashed magenta lines indicate the time interval of the 7 ks outburst detected by XMM-Newton and NuSTAR (see Sects. 2.1 and 2.2).