To create PHA files for input into e.g. XSPEC or ISIS from the same UVOT images used for the
uvotmaghist task, first copy over or locate the latest canned response matrices for the filters you require from the CALDB. These are named swu<filter>_dateversion.rsp, where dateversion will be something like 20041120v104. Run
uvot2pha, adding the extension number to the input filename.
>uvot2pha 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 : swuuu_20041120v104.rsp
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.