Fermi Summer School will be May 26 to June 5, 2026.
The Second Fermi-LAT Catalog of Low-Energy Sources (2FLE) is now officially available. The catalog details 450 significant gamma-ray sources detected between 20 MeV and 200 MeV over 14 years of Fermi mission data (August 2008 to August 2022).
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The FSSC is pleased to announce the official release of the Fourth Fermi-LAT Catalog of High-Energy Sources (4FHL) and the Fermi-GBM SGR/Magnetar Catalog. The 4FHL catalog contains 673 sources detected in the 50 GeV-2 TeV energy range using 16 years of Fermi Large Area Telescope (LAT) observations. The GBM catalog contains 1254 short bursts from 17 years of observations, representing the most comprehensive catalog of magnetar burst activity to date.
An updated version (2.5.3) of the Fermitools is now available. This update includes a number of user reported bug fixes and several backend library updates and changes. These changes include the removal of the Xerces-C XML parsing interface and its replacement with the header-only rapidXML interface, moving from python 3.11 to 3.12, and a range of bug fixes reported by users as well as FSSC team members. This update is also fixes a critical bug preventing the accurate generation of radial gaussian and radial disk source maps and patches a performance issue affecting analysis using Fermipy that were found in the previous release (2.5.2).
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Fermi Observations for MW 962
Mission Week 962 begins with a continuation of the symmetric +/-50 deg. profile from the previous week. Then, on DOY 309 (2026-11-5) at 00:25 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 5663s to 5662s. Note that positive rock angles are south, and negative rock angles are north.
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 Fermi data.
Guest Investigator Program - Details of the Cycle 19 Call for Proposals, deadline Jan 29 2026.
Targets of Opportunity (ToO) - How to apply for a ToO.
New Users - Overview of Fermi analysis basics.
Data & Products - Download Fermi data and access data products such as catalogs.
Analysis Tools - Tools from the FSSC and the user community.
Analysis Threads - Step-by-step guides to various types of analyses that you can do with Fermi data.
Multiwavelength Coordination and Existing Data - Links to related datasets and coordination resources.
The Observatory - Key information about Fermi and its capabilities required for analysis.
Research Highlights - Major Fermi research areas and links to publications and press releases.
Transient Science - Resources for transient and time domain science.
Fermi Users' Group - External advisory body that provides input and perspectives from relevant science communities and members to the Fermi Project.
Fermi Summer School - Annual summer school aimed at graduate students and post-doctoral researchers.
Fermi Meetings - Links to summer schools, symposia, and workshops.
News and Mailing List - Sign up for Fermi news and other lists
