CREATE TABLE table_48643 ("Discipline" TEXT, "Circuit" TEXT, "Event" TEXT, "Session" TEXT, "Cause" TEXT)

The 1997 Japanese Formula 3 Championship is part of what circuit?
SELECT "Circuit" FROM table_48643 WHERE "Event" = '1997 japanese formula 3 championship'
SELECT "Circuit" FROM "table_48643" WHERE "Event" = '1997 japanese formula 3 championship'