Discovered: April 13th, 2008, by the Lick Observatory Supernova Search Team, and independently by Koichi Itagaki, of Japan.
Follow this Link to a NASA Web site on supernovas. It has a very nice animation and a description of what these objects are.
Galaxy NGC 3404:
NGC 3404 is in the constellation of Hydra. A rough distance estimate for this galaxy is 221 million light years, and at that distance, the diameter would be 135,500 light years. This is a very elongated galaxy that is seen nearly edge-on. Although the type is uncertain astronomers usually consider it to be a barred spiral galaxy. It is also classified as IC 2609.
George Normandin, KAS
May 1st, 2008