This document outlines the high-level science requirements of the Zwicky Transient Facility (ZTF), an optical time-domain survey to be based at Palomar Observatory. ZTF is the successor to the Palomar Transient Factory (PTF; 2009–2012) and Intermediate Palomar Transient Factory (iPTF; 2013–present) surveys. PTF and iPTF used a secondhand camera on the Palomar 48-inch Schmidt telescope to survey the sky for astronomical transients and variables. ZTF will instead use a purpose-built survey camera on the same telescope to achieve more than an order of magnitude improvement in survey speed relative to PTF.
The Zwicky Transient Facility collaboration shall construct an Observing System to be located on the Palomar 48-inch Schmidt Telescope and an associated Data System. These elements will be used to conduct a wide-area, high-cadence time-domain survey in order to discover rare and fast evolving explosive transients, large samples of photometrically variable objects, and solar system bodies.
This document outlines the primary science goals of the ZTF project and indicates where these goals lead to specific capability requirements for the ZTF Observing or Data Systems. Detailed discussion of the requirements flow-down and implementation is left to the various Instrument and subsystem Requirements Documents.
TODO: detailed list of CIN for cross-reference.