Neutron stars may be too weak to power some gamma-ray bursts; Black holes may be power source

Long-duration gamma-ray bursts flash across the universe to signal the collapse of a massive star, but this collapsar model predicts either a neutron star or a black hole is left behind. New calculations of the energy released by gamma-ray bursts find it too large to be powered by a neutron star, even highly magnetized, spinning magnetars. Thus, astronomers conclude, the likely power source is a black hole.

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