WINGTIP OF A320 STRIKES TAIL OF OTHER ACFT WHILE TAXIING IN CLOSE QUARTERS AT ORD.

Narrative

WE WERE INSTRUCTED TO TAXI TO RWY 32L BEHIND A COMPANY B737. WHILE ON TXWY 'J' GND CTL CHANGED OUR TAXI RTE TO STAY ON TXWY J TO TXWY W THEN TXWY T TO HOLD SHORT OF J1. AS THE B737 TURNED ONTO J1 WE PASSED BEHIND HIM AND HEADED TO TXWY W. WHILE TURNING ONTO TXWY W THE B737 CALLED GND CTL AND STATED THAT THEY FELT A SHUDDER AS WE PASSED BEHIND THEM. I CHKED THE WING OF MY ACFT AND SAW NO DAMAGE. AT THAT TIME I WAS CONSIDERING RETURNING TO THE GATE FOR AN INSPECTION EVEN THOUGH WE DID NOT HAVE ANY INDICATION THAT WE HAD MADE CONTACT WITH THE B737. I DID FEEL THAT IT WAS PRUDENT TO RETURN AND HAVE THE ACFT INSPECTED. GND CTL THEN TOLD US THAT THE COMPANY WANTED US TO RETURN. ONCE AT THE GATE I CALLED THE FLT DUTY MGR TO ADVISE HIM OF THE INCIDENT. SUPPLEMENTAL INFO FROM ACN 716210: WE WERE UNAWARE OF ANY IMPACT UNTIL ACR Y QUERIED GND CTL AND RETURNED TO THE GATE. REGARDING THE INCIDENT CHAIN OF EVENTS; I WAS DISTR WITH UPDATING THE BOX FROM RWY 9L; OUR ANTICIPATED DEP RWY; TO RWY 32L AT T10 AND XCHKING THE AMENDED TAXI RTE AT APPROX THE SAME TIME THE IMPACT OCCURRED. AS SUCH; I WAS NOT BACKING UP THE CAPT AT A HIGHER RISK TIME IN HIS TAXI PROFILE.