Fermi Gamma-ray Space Telescope

A space-based telescope which observes in the gamma ray portion of the electromagnetic spectrum. For NANOGrav, Fermi sees point sources of gamma rays on the sky, which provides a “treasure map” to finding potential pulsars to add to our array. Put another way, instead of surveying the sky blindly, we can point our radio telescopes more directly to these sources to find pulsars.