GRB060505的谱滞后：长持续时间类的一个可能成员
The Spectral Lag of GRB060505: A Likely Member of the Long Duration Class
摘要：
两个长伽马射线暴，GRB 060505和GRB 060614，发生在附近的星系，红移分别为0.089和0.125。由于它们的接近性和持续时间，开始了深入的后续活动来寻找超新星（SNe）。然而，在这两种情况下都没有发现比原型GRB相关SN 1998 bw暗两个数量级以上的限制。有人建议，爆发，尽管他们的持续时间（4和102秒），属于人口的短伽玛暴已被证明是无关的SNe。在GRB 060614的情况下，这一论点是基于一些指标，包括可忽略的光谱滞后，这与短爆发是一致的。GRB 060505的持续时间较短，但没有测量到光谱滞后。利用Suzakus广域监视器和Swift Burst Alert望远镜对GRB 060505的光谱滞后进行了测量。我们发现，滞后是0.36+/- 0.05秒，不一致的短爆发和长爆发和SN-GRB的属性一致的滞后。这些结果支持了GRB 060505与其他低光度GRB的关联，这些低光度GRB也在恒星形成星系中发现，并表明至少有一些大质量恒星可能在没有明亮SNe的情况下死亡。
英文摘要：
Two long gamma-ray bursts, GRB 060505 and GRB 060614, occurred in nearby galaxies at redshifts of 0.089 and 0.125 respectively. Due to their proximity and durations, deep follow-up campaigns to search for supernovae (SNe) were initiated. However none were found in either case, to limits more than two orders of magnitude fainter than the prototypical GRB-associated SN, 1998bw. It was suggested that the bursts, in spite of their durations (4 and 102 s), belonged to the population of short GRBs which has been shown to be unrelated to SNe. In the case of GRB 060614 this argument was based on a number of indicators, including the negligible spectral lag, which is consistent with that of short bursts. GRB 060505 has a shorter duration, but no spectral lag was measured. We present the spectral lag measurements of GRB 060505 using Suzakus Wide Area Monitor and the Swift Burst Alert Telescope. We find that the lag is 0.36+/- 0.05 s, inconsistent with the lags of short bursts and consistent with the properties of long bursts and SN-GRBs. These results support the association of GRB 060505 with other low-luminosity GRBs also found in star-forming galaxies and indicates that at least some massive stars may die without bright SNe.
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