Spectral evolution of GRB 190114C. Two spectral components are shown: smoothly broken power law (SBPL, red symbols) and power law (PL, blue circles). 1σ errors are shown. Panel A: count rate light curve (black solid line for GBM NaI detector 3 and purple solid line for GBM BGO detector 0). Panel B: flux (integrated in the 10 keV–40 MeV energy range) of the two spectral components. The green line is a power law with slope −2.8 up to 15 s, with slope −1 when the decay of the flux is shallower. Panel C: temporal evolution of the spectral photon index of the SBPL (red and black symbols) and of the PL (blue symbols). Panel D: evolution of the peak energy (Epeak) of the SBPL model.
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