article_snippet.sent: Researchers used the European Space Agency's INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) to discover a new X-ray source near the center of the globular cluster NGC 6388.
article_snippet.sent: NGC 6388 in the X-ray spectrum. 
article_snippet.sent: Chandra's excellent X-ray vision enabled the astronomers to determine that the X-rays from NGC 6388 were not coming from the putative black hole at the center of the cluster, but instead from a location slightly off to one side.
article_snippet.sent: Optical observations had hinted that an intermediate-mass black hole with mass equal to several hundred Suns or more resides at the center of NGC 6388.
article_snippet.sent: The new composite image shows NGC 6388 with X-rays detected by Chandra's in pink and visible light from the Hubble Space Telescope in red, green, and blue, with many of the stars appearing to be orange or white.
article_snippet.sent: With the central black hole ruled out as the potential X-ray source, the hunt continued for clues about the actual source in NGC 6388.
article_snippet.sent: the actual source in NGC 6388 was monitored with the X-ray telescope on board NASA's Swift Gamma Ray Burst mission for about 200 days after the discovery by INTEGRAL.
article_snippet.sent: Researchers used the European Space Agency's INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) to discover a new X-ray source near the center of the globular cluster NGC 6388.