There are a few Mudcat threads about him. If you do a Google Advanced search you'll land on links to several of them. Whether they contribute to your search I can't say.

Here is his obituary and I see that I posted a link to an article after doing a similar WWW search. Felipa also posted a link to a Journal of Music article.

In the thread "Looking for songs from County Louth" he is mentioned several times.

And Corcoran himself posted here. Obit: Willie Beaton has a post. That is the only time I find Corcoran posting on Mudcat.