SGR 1900+14

An intense gamma-ray burst from this star was detected on August 27, 1998; shortly thereafter a new radio source appeared in that region of the sky.

The atoms in the ionosphere, which are usually ionized by the Sun's radiation by day and recombine to neutral atoms by night, were ionized at nighttime at levels not much lower than the normal daytime level.

The Rossi X-ray Timing Explorer (RXTE), an X-ray satellite, received its strongest signal from this burst at this time, even though it was directed at a different part of the sky, and should normally have been shielded from the radiation.

NASA's Spitzer Space Telescope detected a mysterious ring around SGR 1900+14 at two narrow infrared frequencies in 2005 and 2007.

The origin of the ring is currently unknown and is the subject of an article in the May 29, 2008 issue of the journal Nature.