Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Flight | Launch date/time (UTC) | Variant | Launch Pad | Payload | Payload Mass |
| --- | --- | --- | --- | --- | --- |
| D1 | 18 April 2001 10:13 | Mk I(a) | First | GSAT-1 | 1,540kg |
| D2 | 8 May 2003 11:28 | Mk I(a) | First | GSAT-2 | 1,825kg |
| F01 | 20 September 2004 10:31 | Mk I(b) | First | EDUSAT | 1,950kg |
| F02 | 10 July 2006 12:08 | Mk I(b) | Second | INSAT-4C | 2,168kg |
| F04 | 2 September 2007 12:51 | Mk I(b) | Second | INSAT-4CR | 2,160kg |
| D3 | 15 April 2010 10:57 | Mk II | Second | GSAT-4 | 2,220kg |
| D4 | 25 December 2010 10:34 | Mk I(c) | Second | GSAT-5P | 2,130kg |
| Planned launches | Planned launches | Planned launches | Planned launches | Planned launches | Planned launches |
| D5 | December, 2013 | Mk II | Second | GSAT-14 | 1,980kg |
Question:
Tell me the launch date/time for payload of gsat-4
Answer:
15 April 2010 10:57