Testing the Amati and Yonetoku correlations for short gamma-ray bursts

We use a sample of Swift and Fermi short gamma-ray bursts (SGRBs) to test the validity of the Amati and Yonetoku correlation relationships that were originally found for long bursts. The first relationship is between E p,i , the intrinsic peak energy of the GRB prompt emission, and E iso , the equivalent isotropic energy. The second relationship is between E p,i and L iso , the peak isotropic luminosity. The sample is composed of 17 Swift SGRBs and 5 Fermi SGRBs that have a measured redshift and whose spectral parameters, with their uncertainties, are available online. The uncertainties (error bars) on the values of the calculated energy flux P, of the energy E iso , and of the peak isotropic luminosity peak L iso are estimated using a Monte Carlo approach. We find that SGRBs’ energy and luminosity quantities (E p,i , E iso , and L iso ) can be correlated with Amati- and Yonetoku-like relations reasonably well (good or moderately good Person r-values and reduced chi-squares), although the data show large scatter and hence large error bars on the slope and the intercept of the fitting line. Our results are consistent with other similar works, though we here use the largest sample of SGRBs so far on this topic. We also find that E iso and L iso seem to evolve with redshift as (1 + z) 4.9±0.3 and (1 + z) 5.5±0.9 , respectively, with a moderate goodness of fit. However, we caution that this is probably due to selection effects rather than being a genuine redshift evolution of E iso and L iso .