Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Flight', 'Launch date/time (UTC)', 'Variant', 'Launch Pad', 'Payload', 'Payload Mass']

### Response:
SELECT Launch date/time (UTC) FROM table WHERE Payload = gsat-4