On Nov. 11, 2019, while the REXIS instrument was performing detailed science observations of Bennu, it captured X-rays radiating from a point off the asteroid's edge. "Our initial checks showed no previously cataloged object in that position in space," said Branden Allen, a Harvard research scientist and student supervisor who first spotted the source in the REXIS data.
The glowing object turned out to be a newly flaring black hole X-ray binary—discovered just a week earlier by Japan's MAXI telescope—designated MAXI J0637-430.
NASA has now released a GIF showing a visualization of the outburst detected by the OSIRIS-Rex instrument.
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https://www.dailymail.co.uk/sciencetech/article-8067115/NASA-shares-gif-new-black-hole-30-000-light-years-away-seen-students-studying-asteroid.html
https://phys.org/news/2020-03-osiris-rex-students-unexpected-glimpse-black.html