Aragon ICO opened 17 May 2017 at around 6:30pm GMT. The crowdsale which was scheduled to run for 30 days, or until the cap was reached, closed in about 30 minutes.
For this crowdsale only ethereum was accepted. Transactions from exchanges were not accepted and so an ether wallet is a must. I went ahead and used myetherwallet for this.
Aragon had made available the information on receiving address and block number for the ico yesterday, giving out a reminder also not to send any ether prior to the block mine completion.
There seemed to have been a minor glitch on the first 5 minutes of the crowdsale as some transactions appeared to have been rejected. I and my other two colleagues, with whom I did the countdown with, experienced the same thing. We were amazed at first when the sale appeared to have been closed in seconds.
It re-opened after a few minutes and we were able to send in some ether.
The cap of 275 000 ether, which was revealed minutes before the ico start, has been reached though within minutes.