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Creating spectral files

For UVOT spectral files, the canned response matrices are available in the CALDB. They can either be copied to the working directory, or used directly in situ. These are named swu<filter>_dateversion.rsp, where dateversion will be something like 20041120v104. Run uvot2pha, adding the extension number to the input filename.

Input (img or evt) filename []: sw00374210000uuu_sk.img.gz+1 
Source region file name []: Usource.reg 
Background region file name []: Uback.reg 
Output source PHA filename []: Usource.pha 
Output background PHA filename []: Uback.pha 
Response file name []: CALDB

Note that the EBOUNDS extension of the response matrices may need the numbers swapping over (to be lowest energy first) - this is necessary for use in ISIS but not for use in XSPEC.

Also, because the bandpasses of some of the filters overlap in energy/wavelength space, so, too, will the spectral points.