Scientists were making final preparations for the launch of the rocket using a complex technology mastered by just a handful of countries, a top Indian Space Research Organisation (ISRO) official said.
The 415-tonne rocket carrying a two-tonne advanced communications satellite is set for launch from India's space centre at Sriharikota in the southeastern state of Andhra Pradesh at 1048 GMT, ISRO director Deviprasad Karnik said.
