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An unusual supernova in the error box of the γ-ray burst of 25 April 1998

Piro, L.; Pian, E.; Palazzi, E. +46 more

The discovery of afterglows associated with γ-ray bursts at X-ray, optical and radio wavelengths and the measurement of the redshifts of some of these events, has established that γ-ray bursts lie at extreme distances, making them the most powerful photon-emitters known in the Universe. Here we report the discovery of transient optical emission in…