Recommended Target Fields for Commissioning the Vera C. Rubin
  Observatory
  The commissioning team for the Vera C. Rubin observatory is planning a set of
engineering and science verification observations with the Legacy Survey of
Space and Time (LSST) commissioning camera and then the Rubin Observatory LSST
Camera. The time frame for these observations is not yet fixed, and the
commissioning team will have flexibility in selecting fields to observe. In
this document, the Dark Energy Science Collaboration (DESC) Commissioning
Working Group presents a prioritized list of target fields appropriate for
testing various aspects of DESC-relevant science performance, grouped by season
for visibility from Rubin Observatory at Cerro Pachon. Our recommended fields
include Deep-Drilling fields (DDFs) to full LSST depth for photo-$z$ and shape
calibration purposes, HST imaging fields to full depth for deblending studies,
and an $\sim$200 square degree area to 1-year depth in several filters for
higher-level validation of wide-area science cases for DESC. We also anticipate
that commissioning observations will be needed for template building for
transient science over a broad RA range. We include detailed descriptions of
our recommended fields along with associated references. We are optimistic that
this document will continue to be useful during LSST operations, as it provides
a comprehensive list of overlapping data-sets and the references describing
them.
