The phrase "announced in front of" is correct and usable in written English.
It can be used when referring to something that was declared or made known publicly or in the presence of an audience.
Example: "The new policy was announced in front of the entire staff during the meeting."
Alternatives: "declared in front of" or "made known in front of".
Essential, of course, for the individual learning process, but probably not best announced in front of a billion people.
The 21st Bad Sex winner was announced in front of 400 guests at the In & Out Club in Mayfair.
As the latter's transfer was announced in front of the English press, Ferguson struggled to explain how he would shoehorn his abundance of attackers into one team.
Our current bout of LINCOLNMANIA may have begun that frigid day in 2007 when Mr. Obama announced in front of the Old State Capitol in Springfield, Ill., that he was running for president.
In the moments just after pairings were announced in front of an energetic crowd at Frost Arena, South Dakota State's players cited one main concern about the opponent for their debut at the men's N.C.A.A. tournament.
"I do not feel a sense of trust and reassurance that judgments are properly made," Joseph Sexton, a deputy editor on the Metro desk, announced in front of several hundred Times employees.
"If you're going to announce in front of 75,000 people about 1993, then why can't we hang a banner in Crisler arena?" There are those who thought that Webber owes the university an apology, at the very least.
(Odd that he said that. He looked so very, very happy to be announcing in front of the nation's TV cameras that they had uncovered the exact opposite).
Saul announces in front of the Senate Intelligence Committee, in a now-open hearing (no explanation on how or why we've gone from closed to open doors in the space of a single episode): "Yesterday, we took the decisive step to bring those to responsible to justice".
