This notice on the NRA website lists many of those Senators (58 total), including Isakson, as having signed a letter to the administration saying they will not ratify the treaty. http://www.nraila.org/unArmsTradeTreaty
It takes a 2/3 vote of the full Senate to ratify a treaty, or 67 of the 100 Senators (not 2/3 of those present). They cannot come anywhere close to passing this treaty in the U.S. Senate.
Why would you even post something like that without some level of verification?
You can safely add them to your "NOT a credible source of information" list, because that is patently false. There has been no gun ban vote in the U.S. Senate.