Fig. 2.
Top panel: bolometric absorption-corrected X-ray light curve of Swift J1816.7–1613 obtained by Swift/XRT in 2017. Black points correspond to individual XRT observations and the red points show the observations in which we fixed the NH at the average value of 9.3 × 1022 cm−2. Grey points represent the 3-day-averaged Swift/BAT flux in the 15–50 keV band (in arbitrary units). Middle panel: variations in the power-law photon index. Bottom panel: variations in the hydrogen column density NH. The vertical green line indicates the date of our NuSTAR observation.
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