Hersh makes his share of mistakes, but this story reflects a lot reporting and spadework and it rings true. At the time of the bombing my suspicion was that the probable target was a site related to missiles rather than a reactor under construction. This report lends credence to that suspicion.
Annals of National Security: A Strike in the Dark: Reporting & Essays: The New Yorker
A directly related piece.
S. Hersh on CNN.