The CsI detectors of the High Energy X-ray Telescope of the Hard X-ray Modulation Telescope (HXMT/CsI) can be used for gamma-ray all sky monitoring and searching for the electromagnetic counterpart of gravitational wave source. The instrumental responses are mainly obtained by Monte Carlo simulation with the Geant4 tool and the mass model of both the satellite and all the payloads, which is updated and tested with the Crab pulse emission in various incident directions. Both the Energy-Channel relationship and the energy resolution are calibrated in two working modes (Normal-Gain mode & Low-Gain Mode) with the different detection energy ranges. The simulative spectral analyses show that HXMT/CsI can constrain the spectral parameters much better in the high energy band than that in the low energy band. The joint spectral analyses are performed to ten bright GRBs observed simultaneously with HXMT/CsI and other instruments (Fermi/GBM, Swift/BAT, Konus-Wind), and the results show that the GRB flux given by HXMT/CsI is systematically higher by $7.0\pm 8.8\text{\%}$ than those given by the other instruments. The HXMT/CsI-Fermi/GBM joint fittings also show that the high energy spectral parameter can be constrained much better as the HXMT/CsI data are used in the joint fittings.

硬X射线调制望远镜（HXMT / CsI）的高能X射线望远镜的CsI探测器可用于伽马射线全天候监视以及寻找重力波源的电磁对应物。仪器响应主要是通过使用Geant4工具进行的蒙特卡洛模拟以及卫星和所有有效载荷的质量模型获得的，并使用不同入射方向上的Crab脉冲发射对其进行更新和测试。能量通道关系和能量分辨率都在两种工作模式（正常增益模式和低增益模式）下进行了校准，具有不同的检测能量范围。模拟光谱分析表明，HXMT/ CsI在高能带中的频谱参数约束要比在低能带中的约束好得多。使用HXMT / CsI和其他仪器（费米/ GBM，Swift / BAT，Konus- Wind）同时观察到的十个亮GRB进行了联合光谱分析，结果表明HXMT / CsI给出的GRB通量比$7.0\pm 8.8\text{％}$比其他文书所提供的 所述HXMT / CSI-费米/ GBM接头配件还表明，作为高能量的光谱参数可被更好的约束HXMT / CSI数据在关节接头使用。