A magnitude 16 supernova, 2008gg, was discovered by the Catalina Sky Survey on the 10th October, 2008, in the galaxy NGC 539 in the constellation Cetus. The supernova is located 18".7 east and 30".7 south from the centre of the galaxy. As yet the type is unknown.
Position(2000): RA = 01 25 23.41, Dec. = -18°10'20".2
A possible magnitude 16 supernova was observed by T. Kryachko and S. Korotkiy (Kazan State University Astrotel observatory ) in the spiral galaxy NGC 539 in the constellation Cetus (z=0.032), on the 10th October 2008.
Position(2000): RA = 01 2523.04 ± 0.1, Dec = -18 10 20.8 ± 0.1
