A Soft Gamma Repeater (SGR) is a type of astronomical object that is a source of sporadic bursts of gamma radiation, often in the form of soft gamma rays with relatively low energy compared to other gamma-ray sources. SGRs are considered a subclass of magnetars, which are highly magnetized neutron stars. Neutron stars are the remnants of supernova explosions and have extremely strong magnetic fields, which can be hundreds of millions to trillions of times stronger than Earth's magnetic field.
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