The phrase "and announced in a" is correct and usable in written English.
It can be used when referring to something that has been made public or declared in a specific context, such as a report, statement, or event.
Example: "The results of the study were published and announced in a press release."
Alternatives: "and declared in a" or "and revealed in a".
The appointments, to take effect March 22, were made by Bill Keller, the executive editor, and announced in a memorandum to the news staff.
Mr. Obama made no comment on Tuesday about the bill, which he signed in private and announced in a one-sentence statement.
The winner will be decided by a vote of the judges on the morning of March 20 at CERN and announced in a ceremony that evening.
(A century later, however, the society published a critical study of the Hodgson Report and announced in a press release that Blavatsky had been unjustly condemned.) Soon thereafter she left India in failing health.
There in the kitchen, Mr. Gutierrez recalled a Pina Bausch extravaganza in which an elegantly dressed woman walked onstage, looked directly at the audience and announced in a thick German accent: "So, I am here.
Then there was the embarrassing moment when our son prodded the manager's well-fed midriff and announced in a horrid sing-song voice: 'You're having a baby.' You avoid such problems in a big package-type hotel.
In February , 2001 Price attended an I.R.A. event to commemorate the death of a hunger striker, and announced, in an impromptu speech, "Gerry Adams was my commanding officer".
The new policy was presented to the campaign's National Finance Committee in a call Monday evening and announced in an e-mail to supporters.
Somehow Hartlauer, a retailer of lower-priced spectacles (which Silhouette had refused to supply in Austria), subsequently acquired the frames, reimported them and announced in an Austrian press campaign that it would be offering them for sale in its shops.
But faced with furious criticism on the Internet, the ministry changed its position a day later and announced in an angry statement that it would retaliate by taking steps to restrict some American exports to China.
The bursts, observed with NASA's Rossi X-ray Timing Explorer and announced in an electronic circular, are very much like the x-ray bursts that come from soft gamma repeaters, which are known to be magnetars.
