A B747-400 executed a windshear avoidance go around and on the next landing had an airspeed increase in the flare resulting in a firm landing with of a blown tire.

Narrative

Approaching our destination prior to touchdown we were aware of windshear advisories and reports. We briefed and planned accordingly. Reports were of MOD overshoot windshear by an A380 10 minutes prior to our approach. We added 20 KTS to the ref speed. Approach was gusty but manageable. At 200 FT AGL and stabilized we had a sudden drop in indicated airspeed and a WINDSHEAR; WINDSHEAR indication. We executed a windshear avoidance maneuver and were clear of it almost immediately. We returned for landing and had no further windshear indications. In the flare we had a gain in airspeed and floated. I put the airplane on the ground firmly. It was not a hard landing but firm. After slowing and exiting the runway and on our taxi in the Tower informed us that we appeared to have a blown tire on the right side. We checked and the right side gear showed hot; all 5s except one 0. We requested to stop short of the gate to have the gear inspected. We held the aircraft with the engines shut down using only the left brake until we were chocked to allow the brakes to cool. Maintenance was unable to determine a cause for the tire failure but it appeared that the brake locked up on landing; possibly an antiskid failure.