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A pair of monster black holes swirl in a cloud of gas in this artist’s concept of AT 2021hdr.In March 2021, astronomers observed a high-energy burst of light from a distant galaxy. Assigned the name AT 2021hdr, it was thought to be a supernova.
In 2022, another outburst was observed, and over time the Zwicky Transient Facility found a pattern of outbursts every 60–90 days.This can create periodic bursts as the stellar remnant orbits the black hole, but TDEs don't tend to have such regular patterns. The team observed AT 2021hdr using the Neil Gehrels Swift Observatory and found periodic oscillations of ultraviolet and X-ray light that match the transient bursts observed by ZTF., the black holes have a combined mass of about 40 million Suns, and they orbit each other every 130 days.
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