The Gamma Ray Spectrometer (GRS) Data Interface is a web-based data selection and retrieval tool for the GRS Data Node. It is designed for scientists and the public who wish to access data from the Gamma Ray Spectrometer instrument suite on board the 2001 Mars Odyssey mission. Data may be queried and compiled by data type, time, and spatial coordinates (coming soon). For a step-by-step guide on how to use this tool, please follow the How To Use link at the left. The Mars Odyssey Gamma Ray Spectrometer (GRS) is a set of three scientific instruments that work together and complement each other: the Gamma-Ray Spectrometer and Gamma Subsystem (GS), the Neutron Spectrometer (NS), and the High-Energy Neutron Detector (HEND). For more information on the spacecraft, please see the following documents: mission.cat Overview and description of the Odyssey mission's goals and objectives. insthost.cat Description of the Mars Odyssey spacecraft. inst.cat Description of the Gamma-Ray Spectrometer instrument suite. Note for Windows Internet Explorer Users Internet Explorer (IE) users on the Windows platforms may not be able to directly access some files on these web pages. Windows IE users who receive a Invalid Security Catalog error should (Right-Click) on all of the documents with a 'cat' file name extension, such as the above file, inst.cat. Then choose 'Save target as...' (or similar option) to save the file to disk. After the file is saved to disk, open it with NotePad or a similar text editing document. Windows-based Netscape users may (left-click) on files, as usual. Other browsers on the PC platform (Netscape, etc.), UNIX users, and Macintosh users are not affected by this error. Conventions Mouse clicking instructions are included in these pages for the PC-style, two-button mouse. (Left-click) means to click on an icon or text with the left mouse button. Macintosh users have a one-button mouse typically, and should click once with their mouse when (Left-click) is in the instructions. UNIX users with three-button mouses should also use their left mouse button to (Left-click). New Users If you are a new user of the GRS Data Interface, please begin by reading the documentation available by web links in these pages, and start with the How to Use section, which offers step-by-step instructions with detailed explanations. This software is a product of the GRS team of the Lunar and Planetary Laboratory at the University of Arizona. Feedback, suggestions, and input are appreciated.