While you certainly do not have to register to search the archive, download data, analyze data, and write a paper, you may wish to register.
The IRSA Viewer does not access proprietary data, and does not contain any global preferences, so there is no strong reason to log in at this time.
On the other hand, if you are trying to gain access to your proprietary data in a particular archive (other than from the IRSA Viewer), you will need to log in so that the system grants you access to your data. Not all archives served by IRSA have proprietary data. If you got email from an archive's Help Desk about account information, you may already have an account; else you can set up an account (see below). Once you have set up an account, please send us an email at the IRSA Help Desk and we'll tie your new account to your proprietary data.
Select this option to log in if you know your password, or to create a new account.
Select this option to create a new account.
Find this option by selecting "Sign in" in the far top right of the browser page, and then "forgot your password?" appears as an option below the Login button.