Even though it's a highly sophisticated orbiting telescope, there was an element of luck in capturing the black star burst. "We got lucky to have captured an outburst from the black hole during our observing campaign," said Fiona Harrison, the mission's principal investigator at Caltech in Pasadena. "These data will help us better understand the gentle giant at the heart of our galaxy and why it sometimes flares up for a few hours and then returns to slumber."
Also like human eyes, sometimes more telescopes viewing an object are better than one. For two days in July, NuSTAR teamed up with NASA's Chandra X-ray Observatory (which sees lower-energy X-ray light) and the W.M. Keck Observatory on Mauna Kea in Hawaii (which took infrared images) to get a better picture of Sagittarius A*.
Typically, Sagittarius A* is on the quiet end of the black hole spectrum. While some black holes devour stars and other sources of fuel in orbit around them, Sagittarius A* just nibbles or lets fuel pass right by. It's unusual behavior scientists can't yet fully explain.