用伽马射线暴观测校准INTEGRAL SPI反符合屏蔽
Calibration of the INTEGRAL SPI Anti Coincidence Shield with Gamma Ray Bursts observations
摘要：
INTEGRAL SPI仪器的反符合屏蔽（ACS）为探测~ 75 keV以上的伽马射线暴（GRB）提供了极好的灵敏度，但没有方向和能量信息。我们研究了ACS的响应，使用伽玛暴与已知的本地化和良好的光谱信息来自其他卫星。我们推导了不同能区的计数率-通量转换因子，并研究了它与伽玛暴方向和谱硬度的关系。对于一个典型的伽玛射线暴谱，我们发现，在75 keV-1 MeV的范围内，1个ACS计数平均对应于约1 E-10 erg/cm ^2，方向与卫星指向轴正交。这与从蒙特卡罗模拟得出的ACS有效面积大致一致，但有一些迹象表明，后者略微高估了ACS灵敏度，特别是对于靠近仪器轴的方向。
英文摘要：
The Anti Coincidence Shield (ACS) of the INTEGRAL SPI instrument provides an excellent sensitivity for the detection of Gamma Ray Bursts (GRBs) above ~ 75keV, but no directional and energy information is available. We studied the ACS response by using GRBs with known localizations and good spectral information derived by other satellites. We derived a count rate to flux conversion factor for different energy ranges and studied its dependence on the GRB direction and spectral hardness. For a typical GRB spectrum, we found that 1 ACS count corresponds on average to ~ 1E-10 erg/cm^2 in the 75keV-1MeV range, for directions orthogonal to the satellite pointing axis. This is broadly consistent with the ACS effective area derived from the Monte Carlo simulations, but there is some indication that the latter slightly overestimates the ACS sensitivity, especially for directions close to the instrument axis.
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