标题： 伽马射线暴-超新星晚期射电再增亮的观测限制 显示英文标题

标题： Observational Constraints on Late-Time Radio Rebrightening of GRB-Supernovae

摘要： 我们针对三个与伽马射线暴（GRB）相关的超新星（SNe）的射电辐射晚期增亮现象进行了搜索。此前有人提出，与GRB相关的异常明亮的超新星在恒星爆炸数十年后应该会进入Sedov-Taylor阶段，而这种超新星“遗迹”辐射将会超过GRB的射电余辉，并在相当远的距离内被探测到。我们在超新星1998bw/GRB 980425、超新星2003dh/GRB 030329和超新星2006aj/GRB 060218爆炸后的10至18年时间内，对其射电亮度进行了深度限制，其中最深的限制是对GRB 980425/SN 1998bw的$L_{\nu}$ $< 4 \times 10^{26}$ erg s$^{-1}$ Hz$^{-1}$。我们还对周围介质的密度施加了约束，这些约束基于与磁场和同步加速辐射电子相关的微观物理参数的不同假设值。对于GRB 060218/SN 2006aj和GRB 980425/SN 1998bw，这些密度限制对周围介质的密度分布有影响，而GRB 030329/SN 2003dh未被探测到意味着其余辉将不再在GHz频率下可检测到。 显示英文摘要

摘要： We present a search for late-time rebrightening of radio emission from three supernovae (SNe) with associated gamma-ray bursts (GRBs). It has been previously proposed that the unusually energetic SNe associated with GRBs should enter the Sedov-Taylor phase decades after the stellar explosion, and this SN "remnant" emission will outshine the GRB radio afterglow and be detectable at significant distances. We place deep limits on the radio luminosity of GRB 980425/SN 1998bw, GRB 030329/SN 2003dh and GRB 060218/SN 2006aj, 10-18 years after explosion, with our deepest limit being $L_{\nu}$ $< 4 \times 10^{26}$ erg s$^{-1}$ Hz$^{-1}$ for GRB 980425/SN 1998bw. We put constraints on the density of the surrounding medium for various assumed values of the microphysical parameters related to the magnetic field and synchrotron-emitting electrons. For GRB 060218/SN 2006aj and GRB 980425/SN 1998bw, these density limits have implications for the density profile of the surrounding medium, while the non-detection of GRB 030329/SN 2003dh implies that its afterglow will not be detectable anymore at GHz frequencies.