A Comparative Study of the Rest-Frame and Observer-Frame Energetics of Fermi/GBM GRBs

摘要

Using the first 2 years of data on Fermi/GBM GRBs to be published in a comprehensive spectral catalog, we investigate the E_(peak)/Fluence ratio (energy ratio) and E_(peak)-Fluence relation for GBM bursts. As has been shown with CGRO/BATSE data, this relation gives insight into a fundamental discriminator between long and short bursts as well as the dispersion of possible collimation angles for the burst jets. The same relation can be used to show how bursts without a measured redshift compare to the two main E_(peak)-E_(iso) correlations: the Amati and Ghirlanda relations. Finally, a study of the correlation between the energy ratio and the luminosity distance will be presented, as it can be shown that the energy ratio is a measure of the luminosity distance of the GRB.