The Cassiopeia-A DR1 data release consists of a series of g-band exposures on Cassiopeia-A (the SNe remnant) itself, as well as a series of exposures of the surrounding region intended to search for light echos. The field id values are:
4807 4808 4872 4931 4933 4934
4988 4989 4990 4991 5043 5044
5093 5094 5139 5140 5182 5042
