Spectral evolution of GRB 151027A parameters through the entire burst duration. Panel a) shows the temporal evolution of the non-thermal component spectral index. Panel b) shows the evolution of the peak energy when the non-thermal component is described by a CPL. Panel c) shows the BB temperature evolution. The last panel d) shows the comparison between the fluxes, integrated in the 0.3–10 keV energy range, associated with the thermal (squares) and non-thermal component (points). The colour codes of the different symbols corresponds to the spectral data sets (the same colour coding) shown in Fig. 1.
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