Comparing high-energy properties of GRBs in the BAT sample and metallicities of their host galaxies. High-energy properties of events plotted with circles are taken from Nava et al. (2012). The three events plotted with squares have their peak energy (i.e. the peak in νFν spectrum) outside the energy coverage of the BAT instrument: we estimated the peak by using the correlation between Eγ,peak and spectral index Γ, found by Sakamoto et al. (2009), and then computed Eγ,iso and Lγ,iso in the extrapolated 1–10 000 keV range (e.g. Pescalli et al. 2016).
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