The satellite GSAT-6A, which lifted off on the back of the heavyweight GSLV rocket last week, has dropped out of the radar of space agency ISRO. The space research organisation said in a statement today that they have lost communication with the satellite as it was being prepped for the final push that will place it in orbit. Top officials at ISRO did not spell out what exactly went wrong and whether the 2066-ton satellite can be retrieved at all. After Thursday's launch, the satellite was meant to be placed in orbit in three phases.