Physics of Gamma-Ray Bursts Prompt Emission

Figure 18

Spectral decomposition of GRB090902B (taken at time interval (), 9.6–13.0 seconds after the GBM trigger) enables clear identification of the physical origin of the emission. The dash-dotted (red) curve shows the spectrum that would have been obtained if synchrotron radiation was the only source of emission. The dashed (green) curve shows the resulting spectrum from synchrotron and SSC, and the solid (blue) curve shows the spectrum with the full radiative ingredients (synchrotron, SSC, the ~MeV thermal peak, and Comptonization of the thermal photons). Numerical fits are done using the radiative code developed by Pe’er and Waxman [428]. Figure is taken from Pe’er et al. [229].