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INTEGRAL IBIS, SPI, and JEM-X observations of LVT151012

机译：LVT151012的整体IBIS，SPI和JEM-X观察结果

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During the first observing run of LIGO, two gravitational wave events and one lower-significance trigger (LVT151012) were reported by the LIGO/Virgo collaboration. At the time of LVT151012, the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) was pointing at a region of the sky coincident with the high localization probability area of the event and thus permitted us to search for its electromagnetic counterpart (both prompt and afterglow emission). The imaging instruments on board INTEGRAL (IBIS/ISGRI, IBIS/PICsIT, SPI, and the two JEM-X modules) have been exploited to attempt the detection of any electromagnetic emission associated with LVT151012 over three decades in energy (from 3 keV to 8 MeV). The omni-directional instruments on board the satellite, i.e., the SPI-ACS and the IBIS/Veto, complemented the capabilities of the IBIS/ISGRI and IBIS/PICsIT for detections outside their imaging field of view in order to provide an efficient monitoring of the entire LVT151012 localization region at energies above 75 keV. We did not find any significant transient source that was spatially and/or temporally coincident with LVT151012, obtaining tight upper limits on the associated hard X-ray and γ -ray radiation. For typical spectral models, the upper limits on the fluence of the emission from any 1 s counterpart of LVT151012 ranges from F _( γ ) = 3.5 × 10 ~(-8) erg?cm ~(-2) (20–200 keV), within the field of view of the imaging instruments, to F _( γ ) = 7.1 × 10 ~(-7) erg?cm ~(-2) (75–2000 keV), considering the least favorable location of the counterpart for a detection by the omni-directional instruments. These results can be interpreted as a tight constraint on the ratio of the isotropic equivalent energy released in the electromagnetic emission to the total energy of the gravitational waves: E _(75?2000 keV)/ E _(GW)& 4.4 × 10~(-5) . Finally, we provide an exhaustive summary of the capabilities of all instruments on board INTEGRAL to hunt for γ -ray counterparts of gravitational wave events, exploiting both serendipitousand pointed follow-up observations. This will serve as a reference for all future searches.
机译：在LIGO的第一次观测过程中，LIGO / Virgo合作报告了两次重力波事件和一个低位触发（LVT151012）。在LVT151012发生时，国际伽玛射线天体物理学实验室（INTEGRAL）指向与该事件的高定位概率区域重合的天空区域，因此允许我们搜索其电磁对等物（瞬态和余辉发射） ）。 INTEGRAL板上的成像仪器（IBIS / ISGRI，IBIS / PICsIT，SPI和两个JEM-X模块）已被利用来尝试检测与LVT151012相关的任何电磁辐射，这些能量在三十年的能量中（从3 keV到8keV） MeV）。卫星上的全向仪器，即SPI-ACS和IBIS / Veto，对IBIS / ISGRI和IBIS / PICsIT的功能进行了补充，以对其成像视场之外的区域进行检测，以便对整个LVT151012定位区域的能量高于75 keV。我们没有发现任何与LVT151012在空间和/或时间上重合的重要瞬变源，从而获得了相关硬X射线和γ射线辐射的严格上限。对于典型的光谱模型，LVT151012的任何1 s对应物的发射通量的上限范围为F _（γ）= 3.5×10〜（-8）erg？cm〜（-2）（20–200 keV ），在成像仪器的视场内，考虑对应物的最不利位置，使其F _（γ）= 7.1×10〜（-7）erg？cm〜（-2）（75–2000 keV）用于全向仪器的检测。这些结果可以解释为对电磁辐射中释放的各向同性等效能量与重力波总能量之比的严格约束：E _（75？2000 keV）/ E _（GW）< 4.4×10〜（-5）。最后，我们利用偶然的和有针对性的后续观察，对INTEGRAL上所有仪器对重力波事件的γ射线对应物的能力进行了详尽的总结。这将作为以后所有搜索的参考。

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