Photometry of K2 Campaign 9 bulge data

K2 in its Campaign 9 observed dense Galactic bulge regions in order to constrain the microlensing parallaxes and probe for free-floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to very high stellar density, large camera pixels, and unstable pointing of the spacecraft. Here we present a new method for K2 photometry extraction. We extend Causal Pixel Model developed for less-crowded fields by: using the pixel response function together with accurate astrometric grids, combining signals from a few pixels, and ^fully including the astrophysical model. We test the method on two microlensing events and a long-period eclipsing binary.