Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
ISAAC ANTHONY CARL
   2. Issuer Name and Ticker or Trading Symbol
CRIMSON EXPLORATION INC. [CXPO] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Senior VP - Operations
(Last)
(First)
(Middle)
C/O CRIMSON EXPLORATION INC., 717 TEXAS AVENUE, SUITE 2900		 3. Date of Earliest Transaction (Month/Day/Year)
10/01/2013
(Street)

HOUSTON, TX 77002		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 10/01/2013   F(1)   39,185 D $ 0 155,955 D  
Common Stock 10/01/2013   D   155,955 D (2) 0 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) $ 3.31 10/01/2013   D     100,000   (3) 05/09/2020 Common Stock 100,000 (3) 0 D  
Employee Stock Option (right to buy) $ 3.45 10/01/2013   D     75,000   (3) 08/15/2021 Common Stock 75,000 (3) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
ISAAC ANTHONY CARL
C/O CRIMSON EXPLORATION INC.
717 TEXAS AVENUE, SUITE 2900
HOUSTON, TX 77002		       Senior VP - Operations  

Signatures

 /s/ John A. Thomas   10/03/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Withholding of stock to satisfy tax withholding obligations.
(2) Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of April 29, 2013, among Contango Oil & Gas Company ("Contango"), Contango Acquisition, Inc. ("Merger Sub") and Crimson Exploration Inc. ("Crimson"), Merger Sub merged with and into Crimson (the "Merger"), with Crimson surviving the Merger and continuing as a wholly-owned subsidiary of Contango. Upon the October 1, 2013 closing of the Merger, each share of Crimson common stock was cancelled and converted into the right to receive .08288 shares of Contango common stock.
(3) Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of April 29, 2013, among Contango Oil & Gas Company ("Contango"), Contango Acquisition, Inc. ("Merger Sub") and Crimson Exploration Inc. ("Crimson"), Merger Sub merged with and into Crimson (the "Merger"), with Crimson surviving the Merger and continuing as a wholly-owned subsidiary of Contango. Upon the October 1, 2013 closing of the Merger , each option was cancelled and converted into a fully vested option to purchase .08288 shares of Contango common stock at a price equal to the prior exercise price divided by .08288.
 
Remarks:
This Form 4 has been signed by John A. Thomas, Secretary of Crimson Exploration Inc., on behalf of Mr. Isaac, pursuant to an instrument of Power of Attorney, dated July 25, 2011.  The authority granted pursuant to such instrument is to remain in effect until rescinded in writing by Mr. Isaac.

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