Near-discovery SOAR photometry of the third interstellar object: 3I/ATLAS. - Frincke, Tessa T; Yaginuma, Atsuhiro; Noonan, John W; Hsieh, Henry H; Seligman, Darryl Z; Holt, Carrie E; Strader, Jay; Do, Thomas; Craig, Peter; Molina, Isabella (Monthly Notices of the Royal Astronomical Society, 2026)