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Fig. 5.

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Time-resolved spectroscopy using the fa model for burst #4. Results for other bursts are shown in Fig. A.2. Gray markers are used for the blackbody model, and magenta markers are used for the first fa case, constant*(diskbb+comptt), and cyan markers for the second fa case, constant*diskbb+comptt. Since their behavior is similar, the magenta markers overlap the cyan ones. Panel a shows the estimated bolometric flux, panel b shows the time evolution of the blackbody temperature, panel c shows the time evolution of the blackbody normalization, panel d shows the evolution of the fa factor, and panel e gives the reduced χ2 fit statistic. Time is relative to the burst onset (t0).

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