Kepler PRF Models

This repository contains Point Response Function (PRF) models empirically computed from Kepler's Full Frame Images. Each Kepler's CCD and observation quarter has its own PRF model stored in a single FITS file that contains information of the original data in the header and weight values in a BinaryTable. 

The PRF model where computing using the procedure described in the Linearized Field Deblending photometric method (Hedges et al. 2021). This method uses basis splines in polar coordinates to model the PRF profile by solving a linear problem.

The PRF models were created using the psfmachine python library and are meant to be used with the same package. Each FITS file contains the parameters to build design matrices and the "weights" that solve the linear problem, both are used to evaluate the PRF in a coordinate grid and perform PSF-photometry. See the package documentation for examples on how to use these files.