GSLV-Mk III is capable launching 4 ton class of satellites to Geosynchronous Transfer orbit (GTO). It is a three-stage vehicle with two solid motor strap-ons (S200), a liquid propellant core stage (L110) and a cryogenic stage (C25).
GSLV-Mk III-D1 is the first developmental flight, carrying 3136 kg GSAT-19 satellite to a Geosynchronous Transfer Orbit (GTO). The vehicle is configured with a 5 m ogive payload fairing and slanted strap-on nose cone to provide aerodynamic robustness.
On Friday 2 June, 2017, Indian Space Research Prganisation’s Mission Readiness Review (MRR) committee and Launch Authorisation Board (LAB)cleared the 25 and half hour countdown of GSLV MkIII D1 / GSAT-19 mission for Sunday, June 04,2017 starting at 15:58 hr IST