The flaring black hole turned out to be a so-called X-ray binary in the constellation Columba.
X-ray binaries are a class of star or black hole that produce bright flares of X-ray radiation.
In this particular case, the black hole was only discovered a week earlier by Japan’s MAXI telescope.
The X-ray outburst was then identified a few days later by NASA’s Neutron Star Interior Composition Explorer (NICER) telescope.
Both the NICER and MAXI telescopes are mounted on the International Space Station (ISS) 250 miles above Earth.