The log files for the SIRGAS-CON stations are available at:
ftp.sirgas.org/pub/gps/DGF/station/log
If you cannot access the SIRGAS FTP server using your Internet Browser, please access ftp.sirgas.org using an FTP client (such as Filezilla, WinSCP, SmartFTP, Cyberduck, Commander One, AndFTP, FTPClient) or using Windows File Explorer (read instructions).