Fermi Gamma-ray Space Telescope

The Fermi Science Support Center (FSSC) runs the guest investigator program, creates and maintains the mission time line, provides analysis tools for the scientific community, and archives and serves the Fermi data. This web site is the portal to Fermi for all guest investigators.

This view shows the entire sky at energies greater than 1 GeV based on five years of data from the LAT instrument on NASA's Fermi Gamma-ray Space Telescope. Brighter colors indicate brighter gamma-ray sources.
This view shows the entire sky at energies greater than 1 GeV based on five years of data from the LAT
instrument on NASA's Fermi Gamma-ray Space Telescope. Brighter colors indicate brighter gamma-ray sources.
Image Credit: NASA/DOE/Fermi LAT Collaboration

Look into the "Resources" section for finding schedules, publications, useful links etc. The "Proposals" section is where you will be able to find the relevant information and tools to prepare and submit proposals for guest investigator projects. At "Data" you will be able to access the Fermi databases and find the software to analyse them. Address all questions and requests to the helpdesk in "Help".

Fermi Observations for MW 881

Mission Week 881 begins with a continuation of the symmetric +/-50 deg. profile from the previous week. Then, on DOY 107 (2025-4-17) at 01:20 UT a 10-minute freeze observation occurs during which a symmetric +/-50 deg. profile is loaded. This profile continues until the end of the mission week. The survey repeat period DECREASED from 5677s to 5676s. Note that positive rock angles are south, and negative rock angles are north.

» More Timeline Info

Latest News

Feb 6, 2025

Cycle 18 Solicitation Amended

The Fermi Cycle 18 solicitation was amended on February 5 to clarify that the page limit for the Science/Technical/Management section of Phase-1 proposals is four pages for Regular proposals and six pages for Large proposals. These page limits include figures but not references. This is a change from Cycle 17 when the 4- and 6-page limits included references. As a reminder, the solicitation was amended on January 17 to change the proposal due date to March 5, 2025. Full details of the Fermi Cycle 18 solicitation can be found in Roses Appendix D.6

Jan 22, 2025

Fermi Phase 1 Deadline Now 5 Mar 2025

The Phase 1 deadline for the Fermi GI program has been deferred to 5 March 2025. Please see the Cycle-18 call for proposals (ROSES D.6) for details and contact the Fermi Helpdesk with any questions (fermihelp@milkyway.gsfc.nasa.gov).

Jan 6, 2025

LAT Data Processing Restored

LAT data processing was restored over the weekend. It will take another day or more to finish processing the remaining backlog.

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