Fermi Science Support Center

LAT Source Detectability

A web-based tool that calculates the threshold flux for a 5sigma detection by the LAT of a point source superimposed on the diffuse gamma-ray emission at a specified point. The source spectrum is assumed to be a power law with a spectral index of -2.1. The observation over the specified time is in Fermi's survey mode.

Enter Source Name or Source Location Coordinates:

Coordinates must be separated with a comma. Acceptable formats include:

  • Galactic Coordinates in Degrees (l=longitude, b=latitude)
    Example: 123.345, 45.123
  • RA and Dec (B1950 or J2000) in Degrees or hh:mm:ss.s, dd:mm:ss.s
    Example: 39.982, -25.192 or 02:39:55.7, -25:11:31.2

Observation Time in Survey Mode:

Observation Time =