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Description
Gamma-ray bursts (GRBs) are extremely energetic explosions that are powered by ultra-relativistic jets. It is suggested that the shape of the GRB spectrum in the high- energy spectral cutoff region is relevant to the cutoff region of the primary particles within the prompt emission. In this article, a joint-fit Fermi (GBM+LLE) spectral analysis is provided with a sample of 36 GRBs that were detected simultaneously. Attempts have been made to constrain the high-energy cutoff Ec achievable by the high-energy observations to > 130 MeV using the BandCut model. we approved only three out of 36 GRBs that show such high energy cutoff Ec. Whereas others (4 GRBs) show an energy break, Eb, instead. The occurrence of the energy break Eb somewhere in the spectrum between 100-300 keV is due to the BandCut model not be well con- strained towards the end of the high-energy LLE band at >130 MeV. Which then results in spectral parameter values being obtained that are somewhat equivalent to the values obtained from the simple Band model with an energy peak Epeak. This is seemingly close to the high-energy cutoff Ec obtained from the BandCut model, and hence estimate Lorentz factor Γ for three GRBs in the sample.
