MAXI upper limits of the electromagnetic counterpart of GW170817
MAXI upper limits of the electromagnetic counterpart of GW170817
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DOI：
10.1093/pasj/psy076
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发表时间：
2018-05
影响因子：
2.3
通讯作者：
S. Sugita;N. Kawai;S. Nakahira;H. Negoro;M. Serino;T. Mihara;K. Yamaoka;M. Nakajima
中科院分区：
文献类型：
--
作者：
S. Sugita;N. Kawai;S. Nakahira;H. Negoro;M. Serino;T. Mihara;K. Yamaoka;M. Nakajima
本文报道了MAXI观测到的引力波事件GW170817及其电磁对应事件GW170817。GW170817是由高级LIGO和高级处女座探测器探测到的双中子星合并候选者，它是第一个发现光学对应的事件。在MAXI观测中，气体狭缝相机（GSC）在触发后的前92分钟内以90%的概率覆盖了大约62%的GW事件天空区域。在误差区未检测到明显的x射线瞬变，2—10 keV波段显著性为3 $\sigma$的平均通量上限为53/26 mCrab（单轨道观测/ 1天观测）。在GW170817的光学对应物中，GSC在该位置的观测窗口在GW触发后20s开始，但由于ISS进入高粒子背景区，GSC的高压不幸关闭。GSC对位置的第一次观测最终在GW触发后的16797秒（4.6小时）进行，在2- 10 keV波段产生了3 $\sigma$上限8.60$\乘以$10$^{-9}$ erg cm$^{-2}$ s$^{-1}$，尽管这是对口物最早的x射线观测。
We report the MAXI observation of the gravitational-wave (GW) event GW170817 and the electromagnetic counterpart of GW170817. GW170817 is a binary neutron star coalescence candidate detected by the Advanced LIGO and Advanced Virgo detectors, and it is the first event for which the optical counterpart has been discovered. In the MAXI observation, the Gas Slit Camera (GSC) covered approximately 62% of the sky region of the GW event within 90% probability during the first 92 min of orbit after the trigger. No significant X-ray transient was detected in the error region, and the upper limit of the average flux with a significance of 3 $\sigma$ in the 2--10 keV band was 53/26 mCrab (one-orbit observation/one-day observation). In the optical counterpart of GW170817, the observational window of GSC at the position started at 20 s after the GW trigger, but the high voltage of GSC was unfortunately off at the time because the ISS was entering a high-particle-background region. The first observation of the position by GSC was eventually performed at 16797 sec (4.6 hours) since the GW trigger, yielding the 3 $\sigma$ upper limit of 8.60$\times$10$^{-9}$ erg cm$^{-2}$ s$^{-1}$ in the 2--10 keV band, though it was the earliest X-ray observation of the counterpart.