The Allen Telescope Array is a 42-element radio telescope situated at Hat Creek, CA.
One of the major science goals of the ATA is to image large areas of the sky and search for transient events. We have recently published scientific papers describing results from two such surveys, the 1.4 GHz ATA Twenty-cm Survey (ATATS) and the 3.14 GHz Pi GHz Sky Survey (PiGSS). ATATS imaged 700 square degrees of sky 11 times to a sensitivity of ~12 mJy / beam in each epoch. PiGSS imaged four 10 square degree fields (Lockman, ELAIS-N1, NDWFS, and Coma) between 40 and 150 times each, to a sensitivity of ~3 mJy / beam in each epoch, and ~300 uJy / beam in deep fields made from all of the epochs at each position. PiGSS also imaged a 5000 square degree region of sky to ~3 mJy / beam; 2500 square degrees of this region was imaged twice.
Here is a recent poster describing some of the results from the above surveys.
For more information, email scroft@astro.berkeley.edu.