The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 18 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. We thank you in advance for your valuable feedback.
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 555

Mission Week 555 continues the ±50 degree rocking survey profile with a period of two orbits begun in MW553. An updated version of the profile is loaded during a 10 minute freeze observation at the start of MW555, on DOY 017 at 00:20. That profile continues until the end of the mission week.

» More Timeline Info

Latest News

» Fermi Sky Blog
» Fermi Blog

Dec 21, 2018

GBM Update

Due to the position in the Earth's orbit, solar illumination has caused a few of the GBM NaI detectors to reach their operational temperature limits. To reduce the temperatures and preserve the detector lifetimes, these detectors have been powered off. The thermal situation will naturally improve within approximately a week as the solar illumination changes with the orbit. When that occurs all of the NaI detectors will be turned on again. Until then, some data will be unavailable. Triggering continues to be enabled but with reduced efficiency due to fewer operating detectors.

Nov 29, 2018

NASA's Fermi Traces the History of Starlight Across the Cosmos

Scientists using data from NASA's Fermi Gamma-ray Space Telescope have measured all the starlight produced over 90 percent of the universe's history. The analysis, which examines the gamma-ray output of distant galaxies, estimates the formation rate of stars and provides a reference for future missions that will explore the still-murky early days of stellar evolution.
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Nov 27, 2018

Pass 8 Data for the LAT Available

The FSSC is pleased to announce the availability of updated Pass 8 data for the LAT. These data files (P8R3) have a residual background that is significantly lower than the previous Pass 8 data (P8R2) and introduce a new event class, which is defined by a set of additional cuts on top of the SOURCE selection. See arXiv:1810.11394 for more details about the P8R3 data and LAT Data Products for more information. New IRFs and isotropic templates for use with the P8R3 data have been released with Fermitools 1.0.0.

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