(Reuters) - North Sea-focused Ithaca Energy Inc
Valiant shareholders will get 307 pence in cash and 1.33 Ithaca share for each Valiant share.
The offer represents a premium of 37 percent to Valiant's Thursday close on the London Stock Exchange.
British oil and gas company Valiant Petroleum, which has had a dismal exploration performance in 2012, said in September it was considering selling itself.
(Reporting by Karen Rebelo in Bangalore; Editing by Don Sebastian)