:	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING
		SEC File Number 000-25705
		Cusip Number 36229U102

(Check One)	¨  Form 10-K     ¨  Form 20-F     ¨  Form 11-K     x  Form 10-Q    ¨  Form N-SAR
	For Period Ended: September 26, 2008
	¨  Transition Report on Form 10-K
	¨  Transition Report on Form 20-F
	¨  Transition Report on Form 11-K
	¨  Transition Report on Form 10-Q
	¨  Transition Report on Form N-SAR
	For the Transition Period Ended:

READ ATTACHED INSTRUCTION SHEET BEFORE PREPARING FORM. PLEASE PRINT OR TYPE

Nothing in the form shall be construed to imply that the Commission has verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates:             

PART I — REGISTRANT INFORMATION

GSI GROUP INC.

Full Name of Registrant

Former Name if Applicable

125 MIDDLESEX TURNPIKE

Address of Principal Executive Office (STREET AND NUMBER)

BEDFORD, MA 01730

City, State and Zip Code

PART II — RULES 12b-25(b) and (c)

If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check appropriate box)

x	(a)	The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense;
¨	(b)	The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, 11-K, Form N-SAR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report of transition report on Form 10-Q, or portion thereof will be filed on or before the fifth calendar day following the prescribed due date; and
¨	(c)	The accountant’s statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.

PART III — NARRATIVE

State below in reasonable detail the reasons why the Form 10-K, 11-K, 20-F, 10-Q, N-SAR, or the transition report or portion thereof, could not be filed within the prescribed time period.

In August 2008, GSI Group, Inc. (the “Company”) acquired Excel Technology Inc. (“Excel”). As a result of delays in the integration of the financial accounting systems of the Company and Excel, the Company is unable to file its Quarterly Report on Form 10-Q for the quarterly period ended September 26, 2008 within the prescribed time period without unreasonable effort or expense.

PART IV — OTHER INFORMATION

(1) Name and telephone number of person to contact in regard to this notification

Sergio Edelstein	(781)	266-5700
(Name)	(Area Code)	(Telephone Number)

(2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such reports been filed? If answer is no identify report(s).    x  Yes    ¨  No

(3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof?    x  Yes    ¨  No

If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made:

Due to the significance of the purchase accounting analyses related to the Company’s acquisition of Excel that have not yet been completed, a reasonable estimate of results for the quarterly period ended September 26, 2008 cannot be made at this time.

GSI Group Inc.

(Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.

Date:	November 6, 2008	By	/s/    Sergio Edelstein
			Sergio Edelstein
			President and Chief Executive Officer