uvotpy: UVOTPY-2.1.3 Analysis of Swift UVOT grism observations

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. Recently the coincidence loss correction was redeveloped and is now 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.

Recent software updates have been described in the Release notes for 2.1.0. Tthe latest calibration files that were missing in the previous versions were added in 2.1.1, while 2.12 and 2.13 fixes small typos affecting the uvotgrism script and output.

Documentation sources are described in the Readme as well as how to cite this software.