Chandra issued a press release on January 11, 2022, "Astronomers Find Most Luminous “COW” to Shine in X-rays”.
Another member of the new COW class of supernova explosions has been discovered, the brightest one seen in X-rays to date. The new event, dubbed AT2020mrf, is only the fifth found so far belonging to the COW class of supernovae. The group is named after the first supernova found in this class, AT2018cow, whose randomly generated name just happened to spell the word "cow." What lies behind these unusual stellar explosions? New evidence points to either active black holes or neutron stars.
For more information visit:
https://chandra.cfa.harvard.edu/press/22_releases/press_011122cow.html.
