Soft Gamma Repeaters

Soft Gamma Repeaters (SGRs) are rare astronomical objects that emit sudden, intense bursts of gamma rays, the most energetic form of light. They are believed to be a type of neutron star—an ultra-dense remnant of a massive star—that has an extremely strong magnetic field, called a magnetar. These powerful magnetic fields cause stress on the star's crust, occasionally triggering magnetic reconnections that produce intense gamma-ray bursts. SGRs typically emit repeated, short-lasting bursts, and their activity is linked to the star's magnetic instability. They are studied to understand extreme physics under intense magnetic and gravitational forces.