Where does Keogh believe he was in 1960
Keogh does not say, but his notes go through what he thought were the whereabouts of all 56 men from the Irish Brigade in 1960 (when the notes were made)
He says either when the man died if before 1960, whether he was still alive (as with Harry Burke) or whether he did not know if the man were alive or dead.
Keogh is not always 100% accurate, but he did keep up with most of the men from the Irish Brigade (Keogh himself is of course now dead too) On balance I would say that Harry Burke was alive in 1960 and was in contact with Keogh.
When do you think Harry was in an English jail. I cannot find anything in the Times about a trial.