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_13642023_2 ( circuit VARCHAR, rnd VARCHAR, gtu_winning_team VARCHAR )

### Question ###
On what circuit was the GTU winning team #59 Brumos Porsche - Audi in round 5?

### Accurate SQL ###

SELECT circuit FROM table_13642023_2 WHERE rnd = 5 AND gtu_winning_team = "#59 Brumos Porsche - Audi"