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_name_57 ( launch_date_time__utc_ VARCHAR, payload VARCHAR )

### Question ###
Tell me the launch date/time for payload of gsat-4

### Accurate SQL ###

SELECT launch_date_time__utc_ FROM table_name_57 WHERE payload = "gsat-4"