Fig. 3
Top panel: X-ray light curve of the observed flux in the 0.3−10 keV band using Swift, XMM-Newton, and Chandra observations. The solid line corresponds to the best-fit model (broken power-law), while the dashed line shows the fit when a single power-law model is considered. Bottom panel: photon index evolution during the X-ray follow-up observations. The dashed line is the photon index (Γ = 2.06) obtained by the joint spectral fit to the IBIS and Swift data. The 1σ error (± 0.05) is shown as a grey area.
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