Rocking the BOAT：GRB 221009A长期射电光变曲线的起伏
Rocking the BOAT: the ups and downs of the long-term radio light curve for GRB 221009A
AI总结：
本研究基于475天、0.15至230GHz的详尽射电观测，发现GRB 221009A余辉需用三个同步辐射成分（前向激波、反向激波及额外激波）解释，且标准解析模型无法拟合其演化，未观测到喷流间断特征。
摘要：
我们报告了对长伽马射线暴（GRB）221009A的射电观测结果，该暴被学界称为史上最亮暴（the Brightest Of All Time，简称the BOAT）。我们的观测覆盖了爆发后的前475天，观测频率跨越三个数量级，从0.15到230GHz。通过将我们的新观测与文献中可用的观测相结合，我们获得了迄今为止任何GRB在观测频次和光谱覆盖方面最详细的射电数据集，并用其研究余辉的光谱和时间演化。通过测试一系列唯象模型，我们发现三个独立的同步辐射成分最能解释该余辉。高时间和光谱分辨率使我们得出结论：标准解析余辉模型无法解释GRB 221009A观测到的演化。我们探讨了观测与模型之间差异最显著之处，并将我们的发现置于迄今为止研究最深入的GRB射电余辉背景中。我们的观测最好通过三个同步辐射辐射区来解释，我们将其解释为前向激波、反向激波以及可能来自茧结构或更宽外流的额外激波。最后，我们发现观测未显示任何可能由喷流间断导致的晚期光谱或时间变化的证据，但注意到任何侧向结构都可能显著影响喷流间断特征。
英文摘要：
We present radio observations of the long-duration gamma-ray burst (GRB) 221009A which has become known to the community as the Brightest Of All Time or the BOAT. Our observations span the first 475 days post-burst and three orders of magnitude in observing frequency, from 0.15 to 230GHz. By combining our new observations with those available in the literature, we have the most detailed radio data set in terms of cadence and spectral coverage of any GRB to date, which we use to explore the spectral and temporal evolution of the afterglow. By testing a series of phenomenological models, we find that three separate synchrotron components best explain the afterglow. The high temporal and spectral resolution allows us to conclude that standard analytical afterglow models are unable to explain the observed evolution of GRB 221009A. We explore where the discrepancies between the observations and the models are most significant and place our findings in the context of the most well-studied GRB radio afterglows to date. Our observations are best explained by three synchrotron emitting regions which we interpret as a forward shock, a reverse shock and an additional shock potentially from a cocoon or wider outflow. Finally, we find that our observations do not show any evidence of any late-time spectral or temporal changes that could result from a jet break but note that any lateral structure could significantly affect a jet break signature.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
