An international team identified previously unseen component of extreme stellar explosions. This very high energy emission had been previously predicted in theoretical studies but never before directly observed. These rays have reached the Earth in January, 2019, having travelled 4 billion years...

Btw, the phenomenon was discovered by a certain dr. van der Horst, using the MAGIC Collaboration telescopes in La Palma :)

https://www.eurekalert.org/pub_releases/2019-11/gwu-rdh112019.php