The Swift satellite observed supernova 2009Y in NGC 5728 using the onboard Ultraviolet/Optical Telescope on the 5th February, 2009. A magnitude of v = 15.0 ±0.1 was recorded.
A magnitude 14.9 supernova, 2009Y, was discovered on the 1st February, 2009, by Martin Perth Observatory (LOSS) in the Seyfert, barred spiral galaxy, NGC 5728, in the constellation Libra. The supernova is located 9" east and 25" north from the center of the galaxy. As yet the type is unknown.