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Notable transient events

GW170817
Gravitational wave signal detected by the LIGO observatory on 17 August 2017
Kepler's Supernova
Supernova visible from Earth in the 17th century
SN 1054
Supernova which formed the Crab Nebula, first observed in 1054
SN 1572
Supernova in the constellation Cassiopeia
SN 1972E
Supernova in the NGC 5253 galaxy, first observed in 1972.
SN 1987A
1987 supernova event in the constellation Dorado