Nov 9, 2026

Deadline for Fermi Cycle 20 Proposals

The deadline for Fermi Cycle 20 proposals is January 28, 2027. For full details, see the proposal page. Get ready for Cycle 20 with the virtual Town Hall and Proposal Workshop on December 15, 2026, from 2:00 to 3:30 PM EST. Full details and the registration form are available on the Workshop webpage. Please register by 10:00 AM EST on December 15 so we can send you the information needed to join the meeting.

Nov 4, 2026

Second Fermi-LAT Catalog of Low-Energy Sources (2FLE) Released

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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Sep 30, 2026

4FHL and GBM Catalog Releases

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.