  The four-year Kepler mission collected long cadence images of the open
clusters NGC 6791 and NGC 6819, known as "superstamps." Each superstamp region
is a 200-pixel square that captures thousands of cluster members, plus
foreground and background stars, of which only the brightest were targeted for
long or short cadence photometry during the Kepler mission. Using image
subtraction photometry, we have produced light curves for every object in the
Kepler Input Catalog that falls on the superstamps. The IRIS catalog includes
light curves for 9,150 stars, and contains a wealth of new data: 8,427 of these
stars were not targeted at all by Kepler, and we have increased the number of
available quarters of long cadence data for 382 stars. The catalog is available
as a high-level science product on MAST, with both raw photometric data for
each quarter and corrected light curves for all available quarters for each
star. We also present an introduction to our implementation of image
subtraction photometry and the open source IRIS pipeline, alongside an overview
of the data products, systematics, and catalog statistics.

Solar and Stellar Astrophysics;Instrumentation and Methods for Astrophysics