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 868

Mission Week 868 begins with a continuation of the -50 deg. modified sine profile from the previous week. Then, on DOY 16 (2025-1-16) at 01:52 UT a 10-minute freeze observation occurs during which a -50 deg. modified sine profile is loaded. Next, on DOY 22 (2025-1-22) at 11:02 UT a 10-minute freeze observation occurs during which an asymmetric -50/+60 deg. profile is loaded. This profile continues until the end of the mission week. The survey repeat period DECREASED from 5685s to 5681s. Note that positive rock angles are south, and negative rock angles are north.

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Latest News

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.

Jan 3, 2025

LAT Processing Delay

The LAT data processing pipeline is currently offline due to issues with its computing cluster. The satellite itself is functioning normally. At this time, we do not have an estimated timeline for repairs. The data server does not have any LAT data from after December 30, 2024, and there may be some gaps starting from December 25, 2024. Once the pipeline is restored, it will take several days to catch up and make the data available through the server and in the weekly files. We will provide an update by Monday or sooner if more information becomes available.

Dec 19, 2024

LAT Outage - Updated

On December 16, 2024, the LAT experienced a flight software misconfiguration, which put the instrument in an incorrect state. The instrument is safe and responding to commands during this pause in data collection. The spacecraft and GBM are operating normally. Reset and recovery efforts are underway, and we expect to resume data taking soon. Update: At around 19:00 UT on December 19, the LAT reset was completed, and data collection resumed. LAT has returned to normal operations. The resulting data outage lasted 3.3 days. We thank the LAT Operations Team and the Fermi Flight Operations Team for their hard work in returning LAT to science data collection.

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