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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >An optically dark GRB observed by HETE-2: GRB 051022
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An optically dark GRB observed by HETE-2: GRB 051022

机译：HETE-2观察到的光学暗GRB：GRB 051022

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GRB 051022 was detected at 13:07:58 on 2005 October 22 UT by HETE-2. The location of GRB 051022 was determined immediately by the fight localization system. This burst contained multiple pulses, and had a rather long duration of about 190 s. The detections of candidate X-ray and radio afterglows were reported, whereas no optical afterglow was found. Optical spectroscopic observations of the host galaxy revealed a redshift of z = 0.8. Using data derived by a HETE-2 observation of the prompt emission, we found absorption of N-H = (8.8(-2.9)(+3.1)) x 10(22) cm(-2) and visual extinction of A(V) = 49(-16)(+17) mag in the host galaxy. If this is the case, no detection of any optical transient would be quite reasonable. The absorption derived by Swift XRT observations of the afterglow is fully consistent with those obtained from an early HETE-2 observation of the prompt emission. Our analysis implies an interpretation that the absorbing medium may be outside the external shock at R similar to 10(16) cm, which could be a dusty molecular cloud.
机译：HETE-2在2005年10月22日UT于13:07:58检测到GRB 051022。 GRB 051022的位置由战斗本地化系统立即确定。该脉冲包含多个脉冲，持续时间约为190 s。报告了检测到的候选X射线和放射余辉，但未发现光学余辉。对宿主星系的光谱观察表明，z = 0.8的红移。使用由HETE-2即时发射观测得到的数据，我们发现NH =（8.8（-2.9）（+ 3.1））x 10（22）cm（-2）的吸收和A（V）=的消光主星系中的49（-16）（+ 17）磁。如果是这种情况，则没有任何光学瞬变的检测将是非常合理的。通过Swift XRT对余辉的观察得出的吸收与从早期HETE​​-2对瞬态发射的早期观察获得的吸收完全一致。我们的分析暗示了一种解释，即吸收介质可能在R类似于10（16）cm的外部冲击之外，这可能是尘土飞扬的分子云。

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