soft gamma-ray repeater (SGR): An object that produces repeated bursts of lower-energy gamma rays; thought to be produced by magnetars.
[6.4] MAGNETARS & SOFT GAMMA-RAY REPEATERS
[6.5] BLACK HOLES DISCOVERED?
[6.6] MINIHOLES ...
Until 1997, the big problem was that, with the exception of soft gamma-ray repeaters (which may be a distinct class of objects), no gamma-ray burst had been seen in wavelengths longer than X-rays and no quiescent counterpart had been seen.
pulsar is also responsible for a historic gamma-ray burst that occurred on March 5, 1979, and was detected by several satellites. Since then, N 49 has had several subsequent gamma-ray emissions, and is now recognized as a "soft gamma-ray repeater, ...
 See also: Second, Energy, Earth, Dwarf, Milky Way Galaxy
  
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