SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati CXOU J124339.6+113317

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [X]          CXOU (Chandra X-ray Observatory Unregistered)  CXOU JHHMMSS.s+DDMMSS
 [X]          CXU (Chandra X-ray Unregistered) . . . . . CXOU JHHMMSS.s+DDMMSS