In March 1999, a flash of light arrived from a distant and anonymous galaxy in the direction of the constellation Virgo. By chance, a telescope was pointing in the right direction to record this event, which was so faint and subtle that astronomers are only now announcing its discovery. Tiny though it was, this flash has illuminated a mystery regarding the most powerful explosions in the universe. And it could even be the starting-point for a new way of doing astronomy.
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