The Sensex at the Bombay Stock Exchange in volatile trade, was 47 points down in the afternoon deals. The 30-share barometer that rose 16 points in its previous session, fell 47 points to trade at 19,757 when reports last came in. The index had lost almost 498 points in the previous two sessions.The Nifty at the National Stock Exchange was down 18 points, to 5,891, a short while ago.