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

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                                    FORM 8-K

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                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

      Date of Report (Date of earliest event reported): September 26, 2007

                                 GSI GROUP INC.
             (Exact name of registrant as specified in its charter)

                              New Brunswick, Canada
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                 (State or other jurisdiction of incorporation)
                  000-25705                         98-0110412
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     (Commission File Number)             (I.R.S. Employer Identification No.)
                39 Manning Road, Billerica, Massachusetts 01821
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          (Address of principal executive offices, including zip code)
                                 (978) 439-5511
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              (Registrant's telephone number, including area code)

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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 (see General Instruction A.2. below):

|_| Written communications pursuant to Rule 425 under the Securities Act (17 CFR
220.425)

|_| 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))

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ITEM 2.02.  RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

      On  September  26, 2007,  GSI Group Inc.  (the  "Company")  issued a press
release  announcing an  expectation  of increased  financial  results for fiscal
quarter  ended  September  30, 2007. A copy of the press  release is attached as
Exhibit  99.1 to this  Current  Report  on Form 8-K and  incorporated  herein by
reference.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

            (a)   Financial Statements of Businesses Acquired.

                  Not applicable.

            (b)   Pro Forma Financial Information.

                  Not applicable.

            (c)   Shell Company Transactions.

                  Not applicable.

            (d)   Exhibits.

                  99.1     Press Release issued September 26, 2007

      The  information  in this Current  Report on Form 8-K (including the press
release  attached  as  Exhibit  99.1  hereto)  shall not be deemed  "filed"  for
purposes of Section 18 of the  Securities  Exchange Act of 1934, as amended (the
"Exchange  Act") or otherwise  subject to the  liabilities of that section,  nor
shall  it be  deemed  incorporated  by  reference  into  any  filing  under  the
Securities  Act of 1933,  as amended,  or the Exchange  Act,  regardless  of any
general incorporation language in such filing, unless the Company expressly sets
forth in such future filing that such information is to be considered "filed" or
incorporated by reference therein.





                                    SIGNATURE


      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.


                                                  GSI GROUP INC.
                                                  (Registrant)


Date:  September 26, 2007                         By:  /s/  Robert L. Bowen
                                                     ---------------------------
                                                     Robert L. Bowen
                                                     Vice President and
                                                     Chief Financial Officer




                                  EXHIBIT INDEX


        Exhibit No.             Description
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              99.1              Press Release issued September 26, 2007.