They come in two types, long and short, with the former the most common and thought to be caused by the core-collapse of a supernova.
伽马射线爆有长时间的和短时间的两种，其中据信由超新星核的坍塌引起的长时间伽马射线爆是最常见的。
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The white source near the center of the image is a dense, rapidly rotating neutron star, or pulsar, all that remains of a core-collapse supernova explosion.
Gravity causes the core to collapse, making the core temperature rise to nearly 18 billion degrees F (10 billion degrees c), breaking the iron down into neutrons and neutrinos.