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Study of Gamma-Ray Bursts and Afterglows using HETE-2 Satellite

利用 HETE-2 卫星研究伽马射线暴和余辉

基本信息

批准号：
13440063
负责人：
YOSHIDA Atsumasa
金额：
$ 4.86万
依托单位：
AOYAMA GAKUIN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440063/
关键词：
Gamma-Ray Burst GRB afterglow HETE-2 GCN X線バースト軟X線リピーター

项目摘要

The HETE-2 satellite is a small astronomical satellite for mainly studying gamma-ray bursts (GRBs). It was launched on 9^<th> of October in 2000. After having tested functioning of the instruments and adjusted the on-board software during May through August, HETE-2 began steady observations in midsummer of 2001. The satellite operation, maintaining the scientific instruments and quick-look analyses are conducted by the HETE-2 operation team at Mission Operation Center in MIT together with the Japanese team, staffs and graduate students in RIKEN, AGU, Tokyo Tech and NAO. The three scientific instruments are normally working except for one out of four counters in the X-ray detector, of which function was lost by an accident perhaps due to an encounter with a small space debris.HETE-2 successfully localizes GRB locations and sends prompt notifications to ground observers with delay of a few tens of seconds which is three orders of magnitude faster than that of previous experiments such as BeppoSAX. Thereby early afterglows have been observable and it is found that some show very quick decay in time and others display complex structure in their early light curves.Remarkable observational result recently made is that the discovery of a spectral component of Type Ic Supernova in optical spectra of GRB030329 afterglow. This results in compelling evidence of association between GRBs and SNs.The scientific instruments carried by HETE-2 are all sensitive to X-ray below 10 keV, and hereby many X-ray Rich GRBs and X-ray Flashes are detected. The observational data accumulated by HETE-2 suggest that these phenomena have similar properties and thereby a same astrophysical origin.HETE-2 also discovered an unknown zone of high density charged particles around the equator above Ecuador which displayed time variability correlated with the solar activity.

HETE-2卫星是一颗小型天文卫星，主要研究伽马射线暴（GRB）。 HETE-2 于 2000 年 10 月 9 日发射升空。在 5 月至 8 月期间测试了仪器功能并调整了星上软件后，HETE-2 于 2001 年仲夏开始稳定观测。卫星操作、科学仪器维护和快速查看分析由麻省理工学院任务运行中心的 HETE-2 运行团队与日本团队、理化学研究所、AGU、东京工业大学和东京工业大学的工作人员和研究生一起进行。内奥。这三台科学仪器正常工作，除了 X 射线探测器中四分之一的计数器，其功能因一次事故而丧失，可能是由于遇到了小型空间碎片。HETE-2 成功定位了伽玛暴位置，并以几十秒的延迟向地面观察者发送及时通知，这比 BeppoSAX 等之前的实验快了三个数量级。从而可以观测到早期的余辉，发现有些在时间上表现出非常快的衰减，而另一些则在其早期光变曲线中显示出复杂的结构。最近取得的引人注目的观测结果是在GRB030329余辉的光谱中发现了Ic型超新星的光谱成分。这为GRB和SN之间的关联提供了令人信服的证据。HETE-2携带的科学仪器都对10 keV以下的X射线敏感，因此检测到了许多富含X射线的GRB和X射线闪光。 HETE-2 积累的观测数据表明，这些现象具有相似的性质，因此具有相同的天体物理起源。HETE-2 还在厄瓜多尔上方赤道周围发现了一个未知的高密度带电粒子区域，该区域显示出与太阳活动相关的时间变化。