This reference catalog contains astrometry and grizy photometry for 2,990,470,528 point sources at Dec > -30 deg to i ~ 22.5 mag. Details on the contents, construction and use of the catalog are available from the README.txt file included in the catalog, which I will summarise here. To allow us (and others) to take advantage of this, I have produced a point source catalog in the LSST reference catalog format and also in the format we have used in the past. Telescopes both large and small (depths overlapping i ~ 17 to 21 mag) observing fields north of Dec=-30 deg in the optical will have good PS1 calibration sources in the field, observed through the same column as the target sources, allowing simple relative calibration for astrometry, photometry and spectroscopy. This provides a high-quality network of calibration sources over three quarters of the sky to a modest depth.
The Pan-STARRS 3pi stack data (images and catalogs) were released to the world as DR1 on 2016 December 19.
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