Published by section in 2015 theme

I am using 2015 with a child theme. I am trying to figure out the behavior of the “Published by” section which is sometimes added to the bottom of posts. So far it seemts that this section appears if you are in single post view AND the bibliographic info field in the author’s user page is filled in. This is ok, but since the theme already retrieves the author photo from Gravatar, it would be easier if it would also retrieve the bibliographic info from Gravatar, so I wouldn’t have to enter and keep up to date the biographical info both in the local user account and on Gravatar. Is there a workaround? I am also interested in any link to documentation about the behavior of the Published by section of 2015.