Ex-Dividend date is Sept. 11, and payment date is October 1. The dividend is $0.22 per share. This, by the way is not a reduction as has occurred in the subsequent three quarters. Will the next quarter's dividend actually increase and gradually move back up to $0.50 a share. Time will tell but I expect so.
Nuveen will issue a press release announcing it. The press release will most likely come out sometime after the market closes on Monday June 1st, or possibly June 2nd. You can find the press release on Yahoo or Google.
My guess is that the ex-date will probably be either June 10th or June 11th. So if you want to get in on the dividend that is payable on July 1st, you will need to own the stock the day before the ex-date.