CREATE TABLE table_54438 ("Character" TEXT, "Portrayed by" TEXT, "First appearance" TEXT, "Last appearance" TEXT, "Duration" TEXT, "Episodes" TEXT)

Where did the character of Aiden Burn csi detective first appear?
SELECT "First appearance" FROM table_54438 WHERE "Character" = 'aiden burn csi detective'
SELECT "First appearance" FROM "table_54438" WHERE "Character" = 'aiden burn csi detective'