The Swift UVOT grisms (uv: 170-500nm; visible: 285-660 nm) spectral data reduction package is a replacement for the uvotimgrism Ftool from the HEADAS Swift software. This requires a recent HEADAS Swift installation and CALDB as available from HEASARC. The coincidence loss correction is applied now and was formulated in a fully consistent manner to the theory as used successfully for point sources. Updates to the calibration files were made consistent with the reformulated correction.
Documentation sources are described in the Readme as well as how to cite this software.
Since 2023 a number of changes have to be made to support Python API changes and the drop of full support by STScI of stsci.convolve. That will be addressed in version 2.5.