RXTE/PCA (open circles), Swift/XRT (open triangles), and INTEGRAL/ISGRI (filled squares) outburst lightcurve of IGR J17498–2921. For plotting purpose, we chose a time bin of one day. The count rate was converted into flux (0.1–300 keV) using the spectral results reported in Sect. 3.1. The arrows indicate the times of the detected X-ray bursts (see Table 2). The dashed lined correspond to the best-fit linear decay F_-9 =  −0.64   t_day ± 0.09. The three horizontal bars correspond to the time intervals of our spectral results reported in Table 1.