1. INTRODUCTION

2. THE Swift MISSION AND THE BAT INSTRUMENT

3. PROCEDURE
3.1. Data Processing Improvements
3.2. Gain Correction
3.3. Cleaning of Bright Sources
3.4. Pixelization in Mosaicked Sky Maps
3.5. Crab Weighting

4. THE Swift-BAT 70 MONTH CATALOG
4.1. Counterparts
4.2. Source Types and Distribution
4.4. Confused Sources
4.5. Lightcurves

5. SURVEY CHARACTERIZATION
5.1. Source Positional Uncertainty
5.2. Exposure and Noise and Systematic Errors

6. CONCLUSIONS