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        <PersonNm>Rebecca Bernstein</PersonNm>
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        <PersonNm>Bruce Bigelow</PersonNm>
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        <PersonNm>George Jacoby</PersonNm>
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        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>Housing allowances are occasionally granted as hiring incentives. The allowances are generally of a limited duration.</ExplanationTxt>
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        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>Bret Schaefer, CFO and Secretary, received severance of $38,482 in June 2015.</ExplanationTxt>
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        <ExplanationTxt>During the year ended June 30, 2015, the only in-kind contribution was the $12.5 million contribution from the Carnegie Institution of Washington ("Carnegie"). As part of its commitment to fund the Corporation, Carnegie has contributed the long term rights for a period of 100 years to use land in Las Campanas, Chile for the construction and operation of the Giant Magellan Telescope. The contribution was recognized in fiscal year 2015 as all requirements for the contribution were satisfied and it was approved by the Board. This $12.5 million is reflected on the statement of financial position as restricted other assets.</ExplanationTxt>
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        <ExplanationTxt>Related organizations have their own Development depARTMENTs to solicit contributions.</ExplanationTxt>
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        <ExplanationTxt>THE MISSION OF THE ORGANIZATION THE GIANT MAGELLAN TELESCOPE ORGANIZATION IS A COLLABORATIVE EFFORT BETWEEN UNIVERSITIES AND RESEARCH INSTITUTIONS TO BUILD A NEXT-GENERATION EXTREMELY LARGE TELESCOPE FOR ASTRONOMICAL RESEARCH.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS USED TO REVIEW FORM 990 A DRAFT OF THE FORM 990 IS EMAILED TO GMTO EXECUTIVE MANAGEMENT AND THE VOTING BOARD OF DIRECTORS FOR REVIEW AND COMMENT PRIOR TO FILING. ONCE THE FORM 990 HAS BEEN FILED, THE FINAL FORM 990 IS AGAIN EMAILED TO THE VOTING BOARD OF DIRECTORS AND ALSO PUT ON A SHARED DRIVE FOR ACCESS BY THE ENTIRE GMTO ORGANIZATION.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS USED TO MONITOR AND ENFORCE CONFICT OF INTEREST POLICY ANNUALLY EACH BOARD MEMBER MUST COMPLETE A DOCUMENT IN WHICH THE MEMBER ATTESTS WHETHER ANY CONFLICTS OF INTEREST EXIST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINES 15A AND 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION FOR TOP EXECUTIVE HIRES, AN INDEPENDENT COMPENSATION FIRM IS ENGAGED TO VALIDATE PROPOSED COMPENSATION PACKAGES. THE PROPOSED COMPENSATION PACKAGES IS BASED UPON COMPARABILITY DATA. ADDITIONALLY, A COMPENSATION COMMITTEE (COMPRISED OF A FEW BOARD MEMBERS) HAS BEEN CREATED TO APPROVE ALL HIGHER LEVEL MANAGEMENT COMPENSATION PACKAGES. FOR ALL OTHER OFFICERS AND KEY EMPLOYEES, PROPOSED COMPENSATION PACKAGES ARE DETERMINED BY USING COMPARABLE DATA AND/OR ENGAGING AN INDEPENDENT COMPENSATION AND BENEFITS CONSULTING FIRM. THE COMPENSATION COMMITTEE THEN REVIEWS AND APPROVES THE PROPOSED COMPENSATION PACKAGE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>METHOD OF MAKING DOCUMENTS AVAILABLE TO THE PUBLIC FINANCIAL STATEMENTS ARE MADE PUBLIC THROUGH THE FILING OF THE FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:ADMINISTRATION TOTAL FEES:130734</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:DEVELOPMENT TOTAL FEES:28871</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:ENGINEERING TOTAL FEES:173086</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:EXPORT COMPLIANCE TOTAL FEES:71821</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:HR TOTAL FEES:203183</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:IT TOTAL FEES:341324</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:MANAGEMENT ADVISORY TOTAL FEES:553742</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:OTHER TOTAL FEES:34386</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:PROJECT MANAGEMENT TOTAL FEES:161144</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:RECRUITING TOTAL FEES:500654</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:TEMPORARY SERVICES TOTAL FEES:235251</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>