Lifetime: February 1987 - November 1991
Country (primary): Japan
The primary science objective of the Gigna mission was to provide observations of X-ray sources in active galactic nuclei and to make precise observations of X-ray celestial bodies.
- Discovered transiten black hole candidates and studied their spectral evolution
- Disocvered weak transients in the galactic ridge
- Found evidence for emission and absoprtion of iron feature in Seyfert galaxies
- Disocvred intense 6-7 keV iron line emission from the galacitc center region