The words science by press conference are pretty much universally used in derision. Wikipedia has a list of results that where rushed into a press conference and later turned out to be erroneous. However it’s much harder to find results released this way that do seem to be correct.
For the purpose of this question an early press release is any release where date of the first non-scientific conference is the same as, or earlier than, the date the paper is made public (e.g., publishing in a journal or posting it online as a pre-print), and a press conference is organised by the researchers (i.e., it can be reasonably considered their intention to release the result that way).
Are there examples of science by press conference that do not seem to contain any major flaws?