Name the circuit for gt3 alex mortimer bradley ellis
CREATE TABLE "calendar" (
  "round" real,
  "circuit" text,
  "date" text,
  "length" text,
  "pole_position" text,
  "gt3_winner" text,
  "gt4_winner" text
);
SELECT "circuit" FROM "calendar" WHERE "gt3_winner"='Alex Mortimer Bradley Ellis';