Senate Amendment Tracking System

Overview
The Senate Amendment Tracking System (ATS) is a web application that displays images of submitted and proposed amendments to legislation pending before the U.S. Senate. Amendments are available on ATS approximately fifteen minutes after the Bill Clerk receives them.

Source

 * Ada S. Cornell, Laura A. Hanson & Michael Greene, "Legislative Research for Congressional Staff: How to Find Documents and Other Resources" 12 (Mar. 25, 2014) (full-text).