Jon Ostrower at FlightGlobal as usual already has a pretty good account of what happened online.
On its take-off roll the aircraft had "just gotten airborne" when the right wingtip struck the ground, causing the aircraft to lose altitude, collapsing the gear, skidding on the runway and catching fire.
Gulfstream confirmed the accient and fatalities in the hours after the crash on Saturday. The crew was identified as experimental test pilots Kent Crenshaw and Vivan Ragusa and technical specialists David McCollum and Reece Ollenburg died in the April 2 accident. All four were residents of Savannah.
“We mourn the loss of our colleagues and friends and extend our deepest sympathies to their families,” said Joe Lombardo, president, Gulfstream. “The Gulfstream team has already rallied to support the people these men left behind, and we know that the local and aviation communities will do the same. On their behalf, we ask for your kindness, support and understanding as they, and the rest of the Gulfstream family, grieve the passing of these fine professionals.”