The potential existence of two separate classes of Long-duration Gamma-Ray Bursts (LGRBs) with and without radio afterglow emission, corresponding to radio-bright/loud and radio-dark/quiet populations, has been recently argued and favoured in the GRB literature. The radio-quiet LGRBs have been found to have, on average, lower total isotropic gamma-ray emissions (Eiso) and shorter intrinsic prompt gamma-ray durations (e.g. T90z). In addition, a redshift −T90z anticorrelation has been discovered among the radio-loud LGRBs, which is reportedly missing in the radio-quiet class. Here, we discuss the significance of the differences between the energetics and temporal properties of the two proposed classes of radio-loud and radio-quiet LGRBs. We show that much of the proposed evidence in support of the two distinct radio populations of LGRBs can be explained away in terms of selection effects and sample incompleteness. Our arguments are based on the recent discovery of the relatively strong, highly significant positive correlation between the total isotropic emission (Eiso) and the intrinsic prompt duration (T90z) that is present in both populations of short-hard and long-soft GRBs, predicted, quantified, and reported for the first time by Shahmoradi (2013a;2013b) and Shahmoradi & Nemiroff (2015).

中文翻译：

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是否存在无线电响亮和无线电安静的伽马射线爆发？

最近在 GRB 文献中争论并支持两种不同类别的长持续时间伽马射线暴 (LGRB) 的潜在存在，有和没有射电余辉发射，对应于射电明亮/响亮和射电暗/安静的群体. 已发现无线电安静的 LGRB 平均具有较低的总各向同性伽马射线发射 (Eiso) 和较短的固有瞬发伽马射线持续时间（例如 T90z）。此外，在无线电响亮的 LGRB 中发现了红移 -T90z 反相关，据报道，在无线电安静类中缺少这种反相关。在这里，我们讨论了两类拟议的无线电响亮和无线电安静 LGRB 的能量学和时间特性之间差异的重要性。我们表明，支持 LGRB 的两个不同无线电种群的许多建议证据可以用选择效应和样本不完整性来解释。我们的论点基于最近发现的总各向同性发射 (Eiso) 与存在于短硬和长软 GRB 种群中的固有瞬发持续时间 (T90z) 之间的相对强、高度显着的正相关性，预测，由 Shahmoradi (2013a;2013b) 和 Shahmoradi & Nemiroff (2015) 首次量化和报告。