Kepler PRF Models

<p>This repository contains Point Response Function (PRF) models empirically computed from Kepler&#39;s Full Frame Images. Each Kepler&#39;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.&nbsp;</p> <p>The PRF model where computing using the procedure described in the&nbsp;Linearized Field Deblending photometric method <a href="https://ui.adsabs.harvard.edu/abs/2021AJ....162..107H/abstract">(Hedges et al. 2021)</a>.&nbsp;This method uses basis splines in polar coordinates to model the PRF profile by solving a linear problem.</p> <p>The PRF models were created using the <a href="https://github.com/SSDataLab/psfmachine"><strong>psfmachine</strong></a> python library and are meant to be used with the same package. Each FITS file contains the parameters to build design matrices and the &quot;weights&quot; 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.</p>