Abstract We present the discovery of a correlation, in a sample of 16 gamma-ray burst 8. 5 GHz radio afterglows, between the intrinsic luminosity measured at 10 days in the rest frame, LRadio, 10d, and the average rate of decay past this time, α10d. The correlation has a Spearman’s rank coefficient of −0. 70 ± 0. 13 at a significance of 3σ and a linear regression fit of ₁₀₃ = -0. 29^+0. 19-₀. ₂₈ (Lₑ₀₃₈₎, ₁₀₃) + 8. 12^+8. 86-₅. ₈₈. This finding suggests that more luminous radio afterglows have higher average rates of decay than less luminous ones. We use a Monte Carlo simulation to show the correlation is not produced by chance or selection effects at a confidence level of 3σ. Previous studies found this relation in optical/UV, X-ray and GeV afterglow light curves, and we have now extended it to radio light curves. The Spearman’s rank coefficients and the linear regression slopes for the correlation in each waveband are all consistent within 1σ. We discuss how these new results in the radio band support the effects of observer viewing geometry, and time-varying microphysical parameters, as possible causes of the correlation as suggested in previous works.
Shilling et al. (Sun,) studied this question.
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