EX-101 INSTANCE DOCUMENT

Exhibit 4.13

144A GLOBAL SECURITY

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (1) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO SECTION 2.07 OF THE INDENTURE, (2) THIS GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.07(a) OF THE INDENTURE, (3) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.12 OF THE INDENTURE AND (4) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

THIS NOTE (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933 (THE “SECURITIES ACT”), AND THIS NOTE MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THIS NOTE IS HEREBY NOTIFIED THAT THE SELLER OF THIS NOTE MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.

THE HOLDER OF THIS NOTE AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) THIS NOTE MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I) IN THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (II) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (III) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE) OR (IV) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (IV) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS NOTE FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN (A) ABOVE.

CUSIP 109178AF0

No. R-1		$298,930,000

BRIGHAM EXPLORATION COMPANY

6 7/8% Senior Notes due 2019

Brigham Exploration Company, a Delaware corporation (the “Company”), which term includes any successor under the Indenture hereinafter referred to, for value received, promises to pay to CEDE & CO., or its registered assigns, the principal sum of TWO HUNDRED NINETY-EIGHT MILLION AND NINE HUNDRED AND THIRTY THOUSAND ($298,930,000) UNITED STATES DOLLARS (or such greater or lesser amount as should be reflected on the Schedule attached hereto) on June 1, 2019.

Interest Payment Dates: June 1 and December 1 of each year, commencing December 1, 2011.

Regular Record Dates: May 15 and November 15 of each year.

Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Date of Issuance: May 19, 2011

IN WITNESS WHEREOF, the Company has caused this Note to be signed manually or by facsimile by its duly authorized officers.

		BRIGHAM EXPLORATION COMPANY,
		a Delaware corporation
		By:		/s/ Ben M. Brigham
				Name:		Ben M. Brigham
				Title:		President, Chief Executive Officer and
						Chairman of the Board
		By:		/s/ Eugene B. Shepherd, Jr.
				Name:		Eugene B. Shepherd, Jr.
				Title:		Executive Vice President and
						Chief Financial Officer

(Trustee’s Certificate of Authentication)

This is one of the 6 7/8% Senior Notes due 2019 described in the within-mentioned Indenture.

		WELLS FARGO BANK, N.A., as Trustee
		By:		/s/ Jayne Sillman
		Authorized Signatory
		Date:		May 19, 2011

[Reverse Side of Note]

BRIGHAM EXPLORATION COMPANY

6 7/8% Senior Notes due 2019

Capitalized terms used herein shall have the meanings assigned to them in the Indenture referred to below unless otherwise indicated.

1. Interest. The Company promises to pay interest on the principal amount of this Note at 6.875% per annum from the date hereof until maturity and shall pay Additional Interest, if any, as provided in the Registration Rights Agreement, dated May 19, 2011 referred below. The Company shall pay interest and Additional Interest, if any, semi-annually in arrears on June 1 and December 1 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each an “Interest Payment Date”). Interest on the Notes shall accrue from the most recent date to which interest has been paid on the Notes (or one or more Predecessor Notes) or, if no interest has been paid, from the date of original issuance; provided that if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date; provided further that the first Interest Payment Date shall be December 1, 2011. The Company shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue principal and premium, if any, from time to time on demand at a rate that is 1% per annum in excess of the rate then in effect; it shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue installments of interest and Additional Interest (without regard to any applicable grace periods) from time to time on demand at the same rate to the extent lawful. Interest shall be computed on the basis of a 360-day year of twelve 30-day months. If a payment date is not a Business Day, payment may be made on the next succeeding day that is a Business Day, and no interest shall accrue on such payment for the intervening period.

2. Method of Payment. The Company shall pay interest on the Notes (except defaulted interest and Additional Interest, if any) to the Persons in whose name this Note (or one or more Predecessor Notes) is registered at the close of business on the May 15th or November 15th immediately preceding the Interest Payment Date, even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as provided in Section 2.13 of the Indenture with respect to defaulted interest. The Company shall pay all Additional Interest, if any, on the dates of its choosing and in the amounts set forth in the Registration Rights Agreement. The Notes shall be payable as to principal, premium, if any, and interest and Additional Interest, if any, at the office or agency of the Company maintained for such purpose, or, at the option of the Company, payment of interest and Additional Interest, if any, may be made by check mailed to the Holders at their addresses set forth in the register of Holders, and provided that payment by wire transfer of immediately available funds shall be required with respect to principal of and interest, premium, if any, on, all Global Notes and all other Notes the Holders of which shall have provided wire transfer instructions to the Company or the Paying Agent. Such payment shall be in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts.

3. Paying Agent and Registrar. Initially, Wells Fargo Bank, N.A., the Trustee under the Indenture, shall act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity.

4. Indenture. The Company issued the Notes under an Indenture dated as of May 19, 2011 (the “Indenture”) among the Company, the Initial Guarantors and the Trustee. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended. The Notes are subject to all such terms, and Holders are referred to the Indenture and such Act for a statement of such terms. To the extent any provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. The Indenture pursuant to which this Note is issued provides that an unlimited amount of Additional Notes may be issued thereunder, subject to compliance with the covenants therein.

5. Optional Redemption.

(a) On or after June 1, 2015, the Company may redeem all or a portion of the Notes, on not less than 30 nor more than 60 days’ prior notice, in amounts of $1,000 or whole multiples of $1,000 in excess thereof at the following redemption prices (expressed as percentages of the principal amount), plus accrued and unpaid interest, if any, thereon, to the applicable redemption date (subject to the rights of holders of record on relevant record dates to receive interest due on an interest payment date), if redeemed during the twelve-month period beginning on June 1 of the years indicated below:

Year		Redemption Price
2015			103.438	%
2016			101.719	%
2017 and thereafter			100.000	%

(b) In addition, at any time and from time to time prior to June 1, 2014, the Company may use the net proceeds of one or more Equity Offerings to redeem up to an aggregate of 35% of the aggregate principal amount of Notes issued under the Indenture (including the principal amount of any Additional Notes issued under the Indenture) at a redemption price equal to 106.875% of the aggregate principal amount of the Notes redeemed, plus accrued and unpaid interest, if any, to the redemption date (subject to the rights of holders of record on relevant record dates to receive interest due on an interest payment date). At least 65% of the aggregate principal amount of Notes (including the principal amount of any Additional Notes issued under the Indenture) must remain outstanding immediately after the occurrence of such redemption. In order to effect this redemption, the Company must complete such redemption no later than 180 days after the closing of the related Equity Offering.

(c) The Notes may also be redeemed, in whole or in part, at any time or from time to time prior to June 1, 2015 at the option of the Company at a redemption price equal to 100% of the principal amount of the Notes redeemed plus the Applicable Premium as of, and accrued and unpaid interest and additional interest, if any, to, the applicable redemption date (subject to the right of holders of record on the relevant record date to receive interest due on the relevant interest payment date).

(d) The Notes may also be redeemed as set forth in Section 4.19 of the Indenture.

(e) If a transaction that would constitute a Change of Control under clause (iii) of the definition of Change of Control under the Indenture occurs at any time prior to June 1, 2012, the Company may, at its option, redeem all, but not less than all, of the Notes at a redemption price equal to 110.0% of the principal amount of the Notes redeemed, plus accrued and unpaid interest, if any, to the redemption date (subject to the rights of holders of record on relevant record dates to receive interest due on an interest payment date). If the Company elects to exercise this redemption right, it must furnish a redemption notice to the Trustee pursuant to Section 3.01 of the Indenture within 60 days following the Change of Control (or, at the Company’s option, prior to such Change of Control but after the transaction giving rise to such Change of Control is publicly announced). Any such redemption may be conditioned upon the Change of Control occurring if the notice is mailed prior to the Change of Control. If the Company exercises the Change of Control redemption right, it may elect not to make the Change of Control Offer contemplated by Section 4.19 of the Indenture unless it defaults in payments due upon redemption.

6. Mandatory Redemption. The Company shall not be required to make mandatory redemption or sinking fund payments with respect to the Notes.

7. Repurchase at Option of Holders.

(a) Upon the occurrence of a Change of Control, each Holder may require the Company to purchase such Holder’s Notes in whole or in part in amounts of $1,000 or whole multiples of $1,000 in excess thereof, at a purchase price in cash in an amount equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase, pursuant to a Change of Control Offer in accordance with the procedures set forth in the Indenture.

(b) Under certain circumstances described in the Indenture, the Company will be required to apply the proceeds of Asset Sales to the repayment of the Notes and/or Pari Passu Indebtedness.

8. Selection and Notice of Redemption. If less than all of the Notes are to be redeemed or purchased in an offer to purchase at any time, the Trustee shall select the Notes to be redeemed or purchased among the Holders of the Notes not more than 60 days prior to the redemption date in compliance with the requirements of the principal national securities exchange, if any, on which the Notes are listed or, if the Notes are not so listed, on a pro rata basis, by lot or in accordance with any other method the Trustee considers fair and reasonable. Redemptions pursuant to Section 3.07(b) of the Indenture shall be made on a pro rata basis or on as nearly a pro rata basis as practicable (subject to the provisions of the Depositary). In the event of partial redemption by lot, the particular Notes to be redeemed shall be selected, unless otherwise provided herein, not less than 30 nor more than 60 days prior to the redemption date by

the Trustee from the outstanding Notes not previously called for redemption. Notices of redemption may not be conditional. If any Note is to be redeemed in part only, the notice of redemption that relates to that Note will state the portion of the principal amount thereof to be redeemed. A new Note in principal amount equal to the unredeemed portion of the original Note will be issued in the name of the Holder thereof upon cancellation of the original Note. Notes called for redemption become due on the date fixed for redemption. On and after the redemption date, interest and Additional Interest, if any, shall cease to accrue on Notes or portions of them called for redemption.

9. Denominations, Transfer, Exchange. The Notes are in registered form without coupons in denominations of $2,000 and whole multiples of $1,000 in excess thereof. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company is not required to transfer or exchange any Note selected for redemption. Also, the Company is not required to transfer or exchange any Note for a period of 15 days before a selection of Notes to be redeemed.

10. Persons Deemed Owners. The registered Holder of a Note will be treated as its owner for all purposes.

11. Amendment, Supplement and Waiver. The Indenture or the Notes may be amended or supplemented only as provided in the Indenture.

12. Defaults. In the case of an Event of Default arising from certain events of bankruptcy, insolvency or reorganization specified in the Indenture, with respect to the Company or any Significant Subsidiary, all outstanding Notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in principal amount of the then outstanding Notes may declare all unpaid principal of, premium, if any, and accrued interest on all Notes to be due and payable immediately, by a notice in writing to the Company (and to the Trustee if given by the Holders of the Notes) and upon any such declaration, such principal, premium, if any, and interest shall become due and payable immediately. The Trustee may withhold from Holders of the Notes notice of any continuing Default or Event of Default (except a Default or Event of Default relating to the payment of principal or interest) if it determines that withholding notice is in their interest. The Holders of not less than a majority in aggregate principal amount of the Notes outstanding by notice to the Trustee may on behalf of the Holders of all outstanding Notes waive any past Default and its consequences under the Indenture except a Default (1) in the payment of the principal of, premium, if any, or interest on any Note (which may only be waived with the consent of each Holder of Notes affected) or (2) in respect of a covenant or provision which under the Indenture cannot be modified or amended without the consent of the Holder of each Note affected by such modification or amendment.

13. Trustee Dealings with the Company. The Trustee, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for the Company or its Affiliates, and may otherwise deal with the Company or its Affiliates, as if it were not the Trustee.

14. No Recourse Against Others. No director, officer, employee, member, limited partner or stockholder of the Company or any Restricted Subsidiary, as such, will have any liability for any obligations of the Company or the Restricted Subsidiaries under the Notes, the Indenture or the Guarantees to which they are a party, or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive liabilities under the federal securities laws.

15. Authentication. This Note shall not be valid until authenticated by the manual signature of the Trustee or an authenticating agent.

16. Additional Rights of Holders of Restricted Global Notes and Restricted Definitive Notes. In addition to the rights provided to Holders under the Indenture, Holders of Restricted Global Notes and Restricted Definitive Notes issued on the Issue Date shall have all the rights set forth in the Registration Rights Agreement dated as of May 19, 2011, among the Company, the Guarantors and the parties named on the signature pages thereof.

17. CUSIP Numbers. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers in notices of redemption as a convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon.

18. Governing Law. This Note shall be governed by, and construed in accordance with, the laws of the State of New York, without giving effect to the conflicts of laws principles thereof.

The Company shall furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to:

BRIGHAM EXPLORATION COMPANY
6300 Bridge Point Parkway
Building Two, Suite 500
Austin, Texas 78730
Facsimile: (512)  ###-###-####
Attention: General Counsel

ASSIGNMENT FORM

To assign this Note, fill in the form below:

(I) or (we) assign and transfer this

Note to:
		(Insert assignee’s legal name)

(Insert assignee’s soc. sec. or tax I.D. no.)

(Print or type assignee’s name, address and zip code)

and irrevocably appoint

to transfer this Note on the books of the Company. The agent may substitute another to act for him.

Date:

Your Signature:

(Sign exactly as your name appears on the face of this Note)

Signature Guarantee*:

OPTION OF HOLDER TO ELECT PURCHASE

If you want to elect to have this Note purchased by the Company pursuant to Section 4.11 or 4.19 of the Indenture, check the appropriate box below:

o Section 4.11       o Section 4.19

If you want to elect to have only part of the Note purchased by the Company pursuant to Section 4.11 or Section 4.19 of the Indenture, state the amount you elect to have purchased:

$ ________________

Date:

Your Signature:
(Sign exactly as your name appears on the face of this Note)
Tax Identification No.:

Signature Guarantee*:

SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE

The following exchanges of a part of this Global Note for an interest in another Global Note or for a Definitive Note, or exchanges of a part of another Global Note or Definitive Note for an interest in this Global Note, have been made:

Amount of Decrease in

Amount of Increase in

Principal Amount

Principal Amount at

Principal Amount at

Maturity of this

Maturity of this

Maturity of this

Global Following such

Date of Exchange

Global Note

Global Note

Decrease (or Increase)

NOTATION OF GUARANTEE

For value received, each Guarantor (which term includes any successor Person under the Indenture) has, jointly and severally, fully and unconditionally and irrevocably guaranteed, to the extent set forth in the Indenture, dated as of May 19, 2011 (the “Indenture”), among Brigham Exploration Company, a Delaware corporation (the “Company”), the Guarantors and Wells Fargo Bank, N.A., as trustee (the “Trustee”), and subject to the provisions in the Indenture, (a) the due and punctual payment of the principal of, premium, if any, and interest on the Notes (as defined in the Indenture), whether at maturity, by acceleration, redemption or otherwise, the due and punctual payment of interest on overdue principal and premium, and, to the extent permitted by law, interest, and the due and punctual performance of all other obligations of the Company to the Holders or the Trustee all in accordance with the terms of the Indenture and (b) in case of any extension of time of payment or renewal of any Notes or any of such other obligations, that the same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration or otherwise. The obligations of the Guarantors to the Holders of Notes and to the Trustee pursuant to the Guarantee and the Indenture are expressly set forth in Article Ten of the Indenture and reference is hereby made to the Indenture for the precise terms of the Guarantee. This Guarantee shall be governed by and construed in accordance with the laws of the State of New York.

		BRIGHAM, INC., a Nevada corporation
		By:		/s/ Eugene B. Shepherd, Jr.
				Name:		Eugene B. Shepherd, Jr.
				Title:		Executive Vice President and Chief Financial Officer
		BRIGHAM OIL & GAS, L.P., a Delaware limited partnership
		By:		BRIGHAM, INC.,
				Its managing general partner
		By:		/s/ Eugene B. Shepherd, Jr.
				Name:		Eugene B. Shepherd, Jr.
				Title:		Executive Vice President and Chief Financial Officer