A Deep, Wide-Field, and Panchromatic View of 47 Tuc and the SMC with
  HST: Observations and Data Analysis Methods
  In HST Cycle 17, we imaged the well known globular star cluster 47 Tucanae
for 121 orbits using ACS and both the UVIS and IR channels of WFC3 (GO-11677,
PI - H. Richer). This unique data set was obtained to address many scientific
questions that demand a very deep, panchromatic, and panoramic view of the
cluster's stellar populations. In total, the program obtained over 0.75 Ms of
imaging exposure time with the three HST cameras, over a time span of 9 months
in 2010. The primary ACS field was imaged in the two broadband filters F606W
and F814W filters, at 13 orientations, for all 121 orbits. The parallel WFC3
imaging provides a panchromatic (0.4 - 1.7 micron) and contiguous imaging swath
over a 250 degree azimuthal range at impact radii of 6.5 -- 17.9 pc in 47 Tuc.
This imaging totals over 60 arcmin^2 in area and utilizes the F390W and F606W
broadband filters on WFC3/UVIS and the F110W and F160W broadband filters on
WFC3/IR.
  In this paper, we describe the observational design of the new survey and one
of the methods used to analyze all of the imaging data. This analysis combines
over 700 full-frame images taken with the three HST cameras into a handful of
ultra-deep, well-sampled combined images in each of the six filters. The
results reveal unprecedented color-magnitude diagrams (CMDs) of the cluster
extending to >30th magnitude in the optical, 29th magnitude in the UV, and 27th
magnitude in the IR. The data set provides a characterization of the complete
stellar populations of 47 Tuc, extending from the faintest hydrogen burning
dwarfs through the main-sequence and giant branches, down to very cool white
dwarf remnants in the cluster. The imaging also provides the deepest probe of
the stellar populations of the background Small Magellanic Cloud (SMC) galaxy,
resolving low mass main-sequence dwarfs with M < 0.2 Msun.
