NASA telescope may have found antimatter annihilating in possibly the biggest explosion since the Big Bang 

 Using NASA's Fermi telescope, astronomers have discovered a hidden "annihilation feature" in the gamma-ray burst known as the "BOAT," or the "brightest of all time." 

https://cdn.mos.cms.futurecdn.net/ybc2paYF3NcZMpWc8mz4F3.png

https://www.space.com/nasa-boat-gamma-ray-burst-antimatter-annihilation