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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Swift and Suzaku observations of the X-ray afterglow from the GRB 060105
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Swift and Suzaku observations of the X-ray afterglow from the GRB 060105

机译：Swift和Suzaku从GRB 060105观察X射线余辉

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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 at 06:49:28 on 2006 January 5 (T-0). The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. The X-ray flux faded during observations from 6.8 x 10(-9) ergs(-1) cm(-2) (at T-0 + 87 s with the Swift/XRT) to 1.5 x 10(-13) erg s(-1) cm(-2) [at T-0 + 94-101 ks with the Suzaku X-ray Imaging Spectrometer (XIS)] in the 2-10 keV energy band. Following prompt emission and successive very steep decay, a shallow decay was observed from To + 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 + 30ks, and another steep decay followed from T-0 + 50ks 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 degrees. 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.
机译：结果显示了Swift和Suzaku对GRB 060105进行的早期X射线余辉观测结果。明亮的长伽马射线暴GRB; 060105在2006年1月5日（T-0）的06:49:28触发了Swift Burst Alert Telescope。 Suzaku团队在Swift触发后的19 ks（5.3 hr）开始了预定的机会观察目标。在观察过程中，X射线通量从6.8 x 10（-9）ergs（-1）cm（-2）（在T-0 + 87 s，使用Swift / XRT）下降到1.5 x 10（-13）erg s （-1）cm（-2）[在T-0 + 94-101 ks，使用Suzaku X射线成像光谱仪（XIS）]在2-10 keV的能带中。在迅速发射和连续的非常陡峭的衰减之后，从To + 187 s到T-0 + 1287 s观察到了浅的衰减。在T-0 +（1.5-3）ks观察到间隙之后，在T-0 +（4-30）ks观察到非常早期的陡峭衰减。光曲线在T-0 + 30ks处再次趋于平坦，并且从T-0 + 50ks到观测结束又出现了另一个陡峭的衰减。两种陡峭的衰减都显示出2.3-2.4的衰减指数。在X射线余辉观测中，这种非常早的断裂（如果是喷流断裂）是最早的情况，这表明喷流非常狭窄，其开角远低于1度。独特的Suzaku / XIS数据使我们能够为该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。

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