Polarpy processes and analyzes data from the POLAR gamma-ray polarimeter, which records spectral and polarization measurements in ROOT format. The package includes utilities to convert raw POLAR data into HDF5 format suitable for use in analysis frameworks and workflows. It supports integration with the 3ML (ascl:2506.018) modeling environment for downstream analysis of spectral and polarization information. Polarpy’s conversion tools streamline handling of POLAR instrument outputs and facilitate preparation of data for scientific modeling. The repository includes example scripts and code to assist users in preparing and analyzing polarization-related datasets.

pynchrotron implements synchrotron emission from cooling electrons. It removes the need for GSL which was originally relied on for a quick computation of the synchrotron kernel. The code has been ported from GSL and written directly in python as well as accelerated with numba. pynchrotron also includes an astromodels (ascl:2506.019) function for direct use in 3ML (ascl:2506.018).