Revisiting the Spectral-Energy Correlations of GRBs with {\it Fermi} Data I: Model-wise Properties

Abstract

Gamma-ray bursts (GRBs) exhibit a diversity of spectra. Several spectral models (e.g., Band, cutoff power-law, and blackbody) and their hybrid versions (e.g., Band+blackbody) have been widely used to fit the observed GRB spectra. Here, we attempt to collect all the bursts detected by {\it Fermi}-GBM with known redshifts from July 2008 to May 2022, motivated to (i) provide a parameter catalog independent from the official \emph{Fermi}/GBM team and (ii) achieve a ``clean" model-based GRB spectral-energy correlation analysis. A nearly complete GRB sample was created, containing 153 such bursts (136 long gamma-ray bursts and 17 short gamma-ray bursts). Using the sample and by performing detailed spectral analysis and model comparisons, we investigate two GRB spectral-energy correlations: the cosmological rest-frame peak energy ($E_{\mathrm{p},\mathrm{z}}$) of the $\nu F_{\nu }$ prompt emission spectrum correlated with (i) the isotropic-bolometric-equivalent emission energy $E_{\gamma ,\mathrm{iso}}$ (the Amati relation), and (ii) the isotropic-bolometric-equivalent peak luminosity $L_{\mathrm{p},\mathrm{iso}}$ (the Yonetoku relation). From a linear regression analysis, a tight correlation between $E_{\mathrm{p},\mathrm{z}}$ and $E_{\gamma ,\mathrm{iso}}$ (and $L_{\gamma ,\mathrm{iso}}$) is found for both the Band-like and CPL-like bursts. More interestingly, the CPL-like bursts do not fall on the Band-like burst Amati and Yonetoku correlations, suggesting distinct radiation processes, and pointing towards the fact that these spectral-energy correlations are tightly reliant on the model-wise properties.

35 pages, 7 figures including 24 panels, 7 tables, accepted for publication in The Astrophysical Journal Supplement Series

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