Supernova prediction: SN Refsdal

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The supernova SN Refsdal, located in a galaxy with a redshift of 1.49, is notable for being the first supernova whose visibility was predicted in advance due to gravitational lensing. Observers have detected multiple images of the supernova, with significant time delays between them. One image captured the event approximately 50 years ago, while another is expected to become visible within the next decade. The labeling system used by the research team has caused some confusion among observers. This event highlights the potential of gravitational lensing in studying distant astronomical phenomena.
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The supernova happened long ago of course, but as far as I know it is the first time the visibility for us is predicted in advance: the host galaxy is at a redshift of 1.49, and due to gravitational lensing we see multiple images with a significant time delay between them. I don't understand the labeling system of the team (see reference below), but they saw the supernova in at least one of the images, another image probably had the supernova 50 years ago, and another image should get it within the next decade.

Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
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Wow, that's pretty cool.
 

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