________________________________________________

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported)

January 31, 2005

GS Mortgage Securities Corp.

(Exact Name of Registrant as Specified in its Charter)

Delaware

333-120274

13-6357101

(State or Other Jurisdiction

Of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

85 Broad Street

New York, New York

10004

(Address of Principal
Executive Offices)

(Zip Code)

Registrant’s telephone number, including area code: (212) 902-1000

None

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events.

The Registrant registered issuances of Mortgage Pass-Through Certificates, Series 2005-AR1 on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, as amended, by a Registration Statement on Form S-3 (Registration File No. 333-120274) (the “Registration Statement”). Pursuant to the Registration Statement, the Registrant issued $680,138,100 aggregate principal amount of Class 1A1, Class 2A1, Class 3A1, Class 3A2, Class 4A1, Class 4A2, Class B1, Class B2, Class B3 and Class R Certificates (the “Publicly Offered Certificates”) on January 31, 2005. This Current Report on Form 8-K is being filed to satisfy an undertaking, contained in the definitive Prospectus dated December 1, 2004, as supplemented by the Prospectus Supplement dated January 27, 2005, to file a copy of the Trust Agreement (as defined below) and other operative agreements executed in connection with the issuance of the Publicly Offered Certificates, a form of which was filed as an exhibit to the Registration Statement.

The Publicly Offered Certificates were issued pursuant to a Master Servicing and Trust Agreement (the “Trust Agreement”), attached hereto as Exhibit 4.5.1, dated as of January 1, 2005, among GS Mortgage Securities Corp., as Depositor, Wells Fargo Bank, N.A., as Securities Administrator and Master Servicer, JPMorgan Chase Bank, N.A., as Custodian, and U.S. Bank National Association, as Trustee, which incorporates by reference the Standard Terms to Master Servicing and Trust Agreement, January 2005 Edition (the “Standard Terms”), attached hereto as Exhibit 4.5.2. The “Certificates” consist of the Publicly Offered Certificates and the Class B4, Class B5 and Class B6 Certificates. The Certificates evidence all of the beneficial ownership interest in a trust fund that consists primarily of a pool of certain conventional, fixed rate, residential mortgage loans with an aggregate outstanding principal balance of approximately $685,623,376 as of January 1, 2005, together with certain other assets. Capitalized terms used herein and not otherwise defined shall have the meanings assigned to them in the Trust Agreement and the Standard Terms.

Item 9.01. Financial Statements and Exhibits.

(a)

Not applicable.

(b)

Not applicable.

(c)

Exhibits:

4.5.1

Master Servicing and Trust Agreement dated as of January 1, 2005, among GS Mortgage Securities Corp., as Depositor, Wells Fargo Bank, N.A., as Securities Administrator and Master Servicer, U.S. Bank National Association, as Trustee, and JPMorgan Chase Bank, N.A., as Custodian

4.5.2

Standard Terms to Master Servicing and Trust Agreement (January 2005 Edition)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GS MORTGAGE SECURITIES CORP.

By: /s/ M. Gill

Name: Michelle Gill

Title: Vice President

Dated: January 31, 2005

EXHIBIT INDEX

Exhibit No.

Description

Page No.

4.5.1

4.5.2

Standard Terms to Master Servicing and Trust Agreement (January 2005 Edition)

GSR Mortgage Loan Trust 2005-AR1 8-K