

For Immediate Release		NEWS RELEASE Contacts: Gastar Exploration, Inc. Michael A. Gerlich, Chief Financial Officer 713-739-1800 / mgerlich@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.com Anne Pearson / apearson@DennardLascar.com Dennard-Lascar Associates: 713-529-6600

Gastar Exploration Announces Expanded Credit Facility

HOUSTON, December 9, 2013 - Gastar Exploration, Inc. (“Gastar”) (NYSE MKT: GST) today announced that the Borrowing Base under its Senior Secured Revolving Credit Facility has been confirmed by the lending participants in the amount of $100 million, effective immediately. The Borrowing Base was previously set at $50 million. Presently, Gastar has no borrowings drawn under the revolving credit facility. The next borrowing base redetermination is scheduled to occur in May 2014.

Gastar’s Chief Financial Officer, Michael A. Gerlich, commented, “This increase in our credit facility reflects the higher value of our asset base following the completion of our West Edmond Hunton Lime Unit (WEHLU) acquisition in Oklahoma and successful drilling in our areas of focus. We believe the additional liquidity provided by this borrowing base increase, internally generated cash flow and cash on hand will support continued development of our Hunton Lime and Marcellus assets.”

About Gastar Exploration

Gastar Exploration, Inc. is an independent energy company engaged in the exploration, development and production of oil, natural gas, condensate and natural gas liquids in the United States. Gastar's principal business activities include the identification, acquisition, and subsequent exploration and development of oil and natural gas properties with an emphasis on unconventional reserves such as shale resource plays. Gastar is currently pursuing the development of liquids-rich natural gas in the Marcellus Shale in West Virginia and is also in the early stages of exploring and developing the Hunton Limestone horizontal oil play in Oklahoma. For more information, visit Gastar's website at www.gastar.com.

Safe Harbor Statement and Disclaimer

This news release includes “forward looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward looking statements give our current expectations, opinion, belief or forecasts of future events and performance. A statement identified by the use of forward looking words including “may,” “expects,” “projects,” “anticipates,” “plans,” “believes,” “estimate,” “will,” “should,” and certain of the other foregoing statements may be deemed forward-looking statements. Although Gastar believes that the expectations reflected in such forward-looking statements are reasonable, these statements involve risks and uncertainties that may cause actual future activities and results to be materially different from those suggested or described in this news release. These include risks inherent in natural gas and oil drilling and production activities, including risks of fire, explosion, blowouts, pipe failure, casing collapse, unusual or unexpected formation pressures, environmental hazards, and other operating and production risks, which may temporarily or permanently reduce production or cause initial production or test results to not be indicative of future well performance or delay the timing of sales or completion of drilling operations; delays in receipt of drilling permits; risks with respect to natural gas and oil prices, a material decline in which could cause Gastar to delay or suspend planned drilling operations or reduce production levels; risks relating to the availability of capital to fund drilling operations that can be adversely affected by adverse drilling results, production declines and declines in natural gas and oil prices; risks relating to unexpected adverse developments in the status of properties; borrowing base redeterminations by our banks; risks relating to the absence or delay in receipt of government approvals or fourth party consents; risks relating to the WEHLU Acquisition; risks relating to our purchase of assets from Chesapeake Energy, including the risk of being exposed to unknown contingencies or liabilities that could cause Gastar to not realize the expected benefits of the transaction and the risk that we may be required to fund the transaction by borrowing under our revolving credit facility; risks relating to the divestiture of our East Texas assets, including the risk that the transaction will not be completed or will be completed under different terms; and other risks described in Gastar’s Annual Report on Form 10-K and other filings with the U.S. Securities and Exchange Commission (“SEC”), available at the SEC’s website at www.sec.gov. Our actual sales production rates can vary considerably from tested initial production rates depending upon completion and production techniques and our primary areas of operations are subject to natural steep decline rates. By issuing forward looking statements based on current expectations, opinions, views or beliefs, Gastar has no obligation and, except as required by law, is not undertaking any obligation, to update or revise these statements or provide any other information relating to such statements.

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GASTAR EXPLORATION, INC. 8-K