ZTF Public Data Release 12

The Zwicky Transient Facility (ZTF) and IPAC at the California Institute of Technology announce the twelfth ZTF Public Data Release. ZTF is an optical time-domain survey covering the northern sky visible from Palomar Observatory since 17 March 2018. This release adds 2 months of observations to the eleventh data release, up to 7 May 2022 for the public portion of the survey, and private survey time prior to 4 January 2021. The private surveys include observational programs awarded by Caltech and performed by the ZTF collaboration.

The products include ~39.6 million single-exposure images, ~165,500 co-added images, accompanying source catalog files containing ~645 billion source detections extracted from those images, and 4.3 billion light curves constructed from the single-exposure extractions.

A guide to ZTF Data Release 12, with data access instructions and supporting documentation, is available at https://irsa.ipac.caltech.edu/data/ZTF/docs/releases/latest

Access to the data products is available via the on-line and API services of the NASA/IPAC Infrared Science Archive (IRSA) at https://irsa.ipac.caltech.edu/Missions/ztf.html

Note: transient alerts extracted from difference-images commenced public distribution on June 4, 2018. These alerts continue to be generated and distributed as the public survey proceeds.

ZTF Phase-I (March 2018 - September 2020) was supported by the National Science Foundation and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations were conducted by COO, IPAC, and UW.

ZTF Phase-II (December 2020 onwards) is supported by the National Science Foundation and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, IN2P3, University of Warwick, Ruhr University Bochum and Northwestern University. Operations are conducted by COO, IPAC, and UW.