标题： Swift和Suzaku对GRB 060105 X射线余辉的观测 显示英文标题

标题： Swift and Suzaku Observations of the X-Ray Afterglow from the GRB 060105

摘要： Swift和Suzaku对GRB 060105的早期X射线余辉观测结果如下。 明亮的长时伽马射线暴GRB 060105于2006年1月5日06:49:28由Swift爆发警报望远镜（BAT）触发。 Suzaku团队在Swift触发后19 ks（5.3小时）开始进行预先计划的机遇目标观测。 在瞬发辐射和随后的非常陡峭衰减之后，在T_0+187秒到T_0+1287秒期间观察到了较缓的衰减。在T_0+(1.5-3) ks期间出现观测空白后，在T_0+(4-30) ks期间观察到了极其早期的陡峭衰减。 在T_0+30 ks时光变曲线再次变平，随后从T_0+50 ks到观测结束又出现了另一个陡峭衰减。 两个陡峭衰减都表现出衰减指数为2.3-2.4。 如果这个非常早期的转折是一个喷流转折，那么它是在X射线余辉观测中最早的情况，表明喷流的张角非常小，远低于1度。 独特的Suzaku/XIS数据使我们能够对该GRB中的线发射或吸收设置非常严格的上限。 对于报告的伪红移z=4.0±1.3，铁线等效宽度的上限为50 eV。 显示英文摘要

摘要： Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope (BAT) at 06:49:28 on 5 January 2006. The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. Following the prompt emission and successive very steep decay, a shallow decay was observed from T_0+187 s to T_0+1287 s. After an observation gap during T_0 +(1.5-3) ks, an extremely early steep decay was observed in T_0+(4-30) ks. The lightcurve flattened again at T_0+30 ks, and another steep decay followed from T_0+50 ks to the end of observations. Both steep decays exhibited decay indices of 2.3 - 2.4. This very early break, if it is a jet break, is the earliest case among X-ray afterglow observations, suggesting a very narrow jet whose opening angle is well below 1 degree. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z=4.0+/-1.3 the upper limit on the iron line equivalent width is 50 eV.