BUZZ-Athlon Energy to open at record high after Encana's buyout offer
** Athlon's shares up 24.4 pct at $58.13 premarket, slightly lower than Encana's offer of $58.50
** Athlon's shares poised to open at record high, topping the $51.55 hit in July
** Encana's offer worth $5.93 billion in cash
** Offer is also at a big premium to Athlon's intrinsic valuation of $37.64 per share, according to StarMine
** Through Friday's close, the stock had more than doubled from its IPO price of $20 in August 2013
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