Examining Two-Dimensional Luminosity-time Correlations for Gamma Ray Burst Radio Afterglows with VLA and ALMA

Abstract

Gamma-ray burst (GRB) afterglow emission can be observed from sub-TeV to radio wavelengths, though only 6.6\% of observed GRBs present radio afterglows. We examine GRB radio light curves (LCs) to look for the presence of radio plateaus, resembling the plateaus observed in X-ray and optical. We analyze 404 GRBs from the literature with observed radio afterglow and fit 82 GRBs with at least 5 data points with a broken power law (BPL) model, requiring 4 parameters. From these, we find 18 GRBs that present a break feature resembling a plateau. We conduct the first multi-wavelength study of the Dainotti correlation between the luminosity $L_a$ and the rest-frame time of break $T_a^{\ast }$ for those 18 GRBs, concluding that the correlation exists and resembles the corresponding correlation in X-ray and optical wavelengths after correction for evolutionary effects. We compare the $T_a^{\ast }$ for the radio sample with $T_a^{\ast }$ values in X-ray and optical data (Dainotti et al. 2013, 2020b), finding significantly later break times in radio. We propose that this late break time and compatibility in slope suggests either a long-lasting plateau or the passage of a spectral break in the radio band. We also correct the distribution of the isotropic energy $E_{\mathrm{iso}}$ vs. the rest-frame burst duration $T_{90}^{\ast }$ for evolutionary effects and conclude that there is no significant difference between the $T_{90}^{\ast }$ distribution for the radio LCs with a break and those without.

13 pages, 6 figures, 1 table. Accepted for publication in ApJ

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