CLE APCH CTLR DESCRIBES SUSPECTED SEPARATION INCIDENT AS ADJACENT CTLR ENTERED AIRSPACE WITHOUT PROPER COORD OR AUTH.

Narrative

WHILE WORKING THE SATELLITE POS; THE PREVIOUS CTLR HAD AN ACFT 'TAGGED UP' INDICATING SHE HAD AUTH THE ARR CTLR TO DSND THAT ACFT AS LOW AS 4000 FT. THAT ACFT LANDED CLE WITHOUT INCIDENT. I HAD AN LJ45 ON A 320 DEG HDG DESTINED FOR BKL AT 3000 FT. THE ARR CTLR DSNDED AN ACFT TO 3000 FT IN MY AIRSPACE AND I ISSUED TFC TO LJ45 IN AMPLE TIME TO ISSUE VISUAL SEPARATION INSTRUCTIONS. I ISSUED TFC OF THE NEXT ARR; AN E135 RJ AT OR ABOVE 4000 FT AT THE TIME. AS I OBSERVED THE RJ DSND BELOW 4000 FT; I REISSUED THE TFC TO LJ45 AND HE RPTED THE TFC IN SIGHT AND I INSTRUCTED THE ACFT TO MAINTAIN VISUAL SEPARATION FROM THAT TFC. I DO NOT KNOW HOW CLOSE THE ACFT WERE TO EACH OTHER AT THE TIME THE VISUAL SEPARATION INSTRUCTION WAS ISSUED. AT THE TIME OF THIS OCCURRENCE; I OBSERVED THE OPERATIONAL SUPVR WHO HAD BEEN WATCHING THE ARR CTLR; TURN AROUND AND WALK BACK TO THE SUPVR'S DECK. UPON BEING RELIEVED; I WENT TO THE SUPVR; ASKING HER WHAT WAS GOING ON THERE. SHE SHOOK HER HEAD IN WHAT APPEARED TO BE FRUSTRATION. LATER; WHEN ASKED ABOUT THE INCIDENT; I TOLD HER THAT I DID NOT KNOW FOR SURE IF THERE WAS A LOSS OF SEPARATION OR NOT.