Some investors are sweeping up Sepracor (SEPR) calls Tuesday morning. Call activity is already running 20x normal. Shares are slightly lower near $15.89 and buyers are using sweep routers to accumulate nearly 1,500 each of the June 17.5 and July 15 calls, causing IVs to lift nearly 10 points to the 69% range atm. Briefing is attributing the activity to takeover chatter.