Spitzer Space Telescope - Guaranteed Time Observer Proposal #30 IRAC Shallow Survey Principal Investigator: Peter Eisenhardt Institution: JPL Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 61.8 Abstract: The NOAO deep survey is presently surveying a 9 - 10 square degree region in Bootes to K=19.5 and R=26. Data in Bw, I, J and H is also being obtained. The MIPS and IRS GTO teams are planning to survey this region with MIPS. The primary objectives for the IRAC survey of this region are to identify galaxy clusters with redshifts greater than one, and to find field brown dwarfs. If the luminosity evolution observed in clusters to redshift one continues to hold, we expect to detect L*+1 (evolving) cluster galaxies to z=2.