UPDATE 3-Graham Packaging gets $1.64 bln rival buy-out offer By: Reuters: Company News June 13, 2011 at 11:44 AM EDT * Shares rise as much as 19 pct (Adds comments from analyst, Silgan; background about Blackstone; Updates shares) Read More >> Related Stocks: Alexis Minerals Corporation Blackstone Inc Coca-Cola Company Silgan Holdings Unilever NV