Swift-UVOT紫外可见光棱镜定标
The Swift-UVOT ultraviolet and visible grism calibration
摘要：
我们提出了校准的雨燕UVOT grisms，其中有两个，分别提供低分辨率场光谱在紫外和光学波段。紫外线棱镜覆盖1700-5000埃的范围，在2600埃时，源星等u=10-16 mag的光谱分辨率为75，而可见光棱镜覆盖2850-6600埃的范围，在4000埃时，源星等b=12-17 mag的光谱分辨率为100。在操作期间使用的所有模式。波长精度（1-sigma）在UV棱镜计时模式下为9埃，在UV棱镜标称模式下为17埃，在可见光棱镜中为22埃。在UV棱镜中低于2740埃的范围和在可见光棱镜中低于5200埃的范围从不会受到更高光谱级的重叠。grisms的通量校准包括我们为探测器中的符合损失而开发的校正。符合损失校正的误差小于20%。在标称模式下，光谱在探测器上的位置仅对有效面积（灵敏度）产生百分之几的影响，但在时钟模式下会发生很大变化。有效面积的误差从UV棱镜计时模式的9%到可见光棱镜计时模式的15%。
英文摘要：
We present the calibration of the Swift UVOT grisms, of which there are two, providing low-resolution field spectroscopy in the ultraviolet and optical bands respectively. The UV grism covers the range 1700-5000 Angstrom with a spectral resolution of 75 at 2600 Angstrom for source magnitudes of u=10-16 mag, while the visible grism covers the range 2850-6600 Angstrom with a spectral resolution of 100 at 4000 Angstrom for source magnitudes of b=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1-sigma) is 9 Angstrom in the UV grism clocked mode, 17 Angstrom in the UV grism nominal mode and 22 Angstrom in the visible grism. The range below 2740 Angstrom in the UV grism and 5200 Angstrom in the visible grism never suffers from overlapping by higher spectral orders. The flux calibration of the grisms includes a correction we developed for coincidence loss in the detector. The error in the coincidence loss correction is less than 20%. The position of the spectrum on the detector only affects the effective area (sensitivity) by a few percent in the nominal modes, but varies substantially in the clocked modes. The error in the effective area is from 9% in the UV grism clocked mode to 15% in the visible grism clocked mode .
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