UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: June 16, 2017
Form: S-4
CIK: 0001172139
Company Name: BILL BARRETT CORP
File Number: 333-218414
CIK: 0001524790
Company Name: Aurora Gathering, LLC
File Number: 333-218414-02
CIK: 0001466850
Company Name: Circle B Land Co LLC
File Number: 333-218414-01
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