Predicting Spectral Parameters in the Backscattering-dominated Model for the Prompt Phase of GRBs

2021 
We present new results of the backscattering dominated prompt emission model in which the photons generated through pair annihilation at the centre of a gamma ray burst (GRB) are backscattered through Compton scattering by an outflowing stellar cork. %We show that the produced spectral features are capable of producing spectral features that are widely observed in GRBs. Using Comptonized pair annihilation spectrum accompanied by bremsstrahlung radiation for seed photons, we show that the obtained spectra produce low energy photon index $\alpha \sim -1.1$, steeper high energy slopes $\beta \sim -2.25$ and spectral peak energy $\sim 1$ MeV. These slopes are consistent with the average values obtained in GRB prompt phase observations. Moreover, the spectral peak energy is similar to the most abundant observed GRB prompt emission peak energy, after correcting for the cosmological redshift.
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