Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17971 ( "Round" real, "Circuit" text, "Date" text, "Length" text, "Pole Position" text, "GT3 Winner" text, "GTC Winner" text )

### Question ###
what are all the circuit for 9 september and gt3 winner hector lester allan simonsen

### Accurate SQL ###

SELECT "Circuit" FROM table_17971 WHERE "Date" = '9 September' AND "GT3 Winner" = 'Hector Lester Allan Simonsen'