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 681

Mission week 681 starts with a continuation of the modified sine rocking profile from the previous week. On day of year 168 (2021-06-17 ) at 01:30 there is a 10 minute freeze observation during which an updated modified sine profile is loaded. This profile continues until DOY 173 (2021-06-22) at 20:11 when there is a 10 minute freeze observation during which an asymmetric +50/-60 deg. profile is loaded. This profile continues until the end of the week. Note that positive rock angles are south, and negative angles are north.

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Latest News

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May 24, 2021

Fermi Cycle-14 GI Selected Programs Announced

The stage-I selection process for the Fermi Cycle-14 Guest Investigator program has been completed. There were a total of 35 new programs selected for stage-I out of 87 proposals submitted. A list of the selected programs, including the PIs, titles and abstracts is available on the FSSC web site.

May 10, 2021

NASA Mailing List Change

NASA has changed the backend software that runs its mailing lists. The web interface to managing subscriptions can now only be accessed by NASA personnel. NASA is working on a long-term solution that will provide a public web front. Until that is implemented, you can change subscription preferences using commands in an email sent to the service. Subscribe to a list by sending an e-mail to LISTNAME-join@lists.nasa.gov (no subject or text in the body is required). Unsubscribe from a list by sending an e-mail to LISTNAME-leave@lists.nasa.gov (no subject or text in the body is required). If you are having trouble subscribing or unsubscribing from a list, you can send an e-mail to the list owner at LISTNAME-owner@lists.nasa.gov. We have included these instructions on the web page.

Apr 20, 2021

Updated Spacecraft Position and History Files Available

The updated files include the addition of the SC_VELOCITY column. This column contains a vector with the spacecraft velocity in meters per second (in the same coordinate frame as SC_POSITION) at the start of the interval to aid pulsar timing and other precise applications that require the full state vector. The files improve the calculation of the spacecraft geodetic latitude and altitude. The geodetic calculation now uses the exact Ferrari's solution rather than the approximation that was done previously. The changes in latitude are less than 0.04 degrees. The changes in altitude are from 0 to 6 km. In both cases, the difference is minimum at the equator and maximum at the latitude extremes. The files also use the latest the IGRF model, a standard mathematical description of the Earth's main magnetic field. The previous IGRF expired at the end if 2019. The 2020 and 2021 spacecraft files have been reprocessed to use the IGRF-13 model. Both the 30-second and 1-second files have been updated. The FSSC's data server now returns the new files. The weekly and mission long files have been updated on the FSSC's FTP site.

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