The Fermi spacecraft being readied for launch. The GBM detectors are labeled. Image credit: Jim Grossmann, NASA

Six of the LAT towers installed. Credit: NASA/DOE/Fermi LAT Collaboration

The Fermi spacecraft shortly before launch. The solar panels are folded at the sides. The GBM detector modules and the telemetry antennas can be seen on the left side. Credit: NASA/DOE/Fermi LAT Collaboration

One of the LAT towers formed by a stack of 19 trays. Credit: NASA/DOE/Fermi LAT Collaboration

Candidate gamma-ray event in first LAT flight tower. Credit: NASA/DOE/Fermi LAT Collaboration

The LAT calorimeter module shown during insertion of the crystal detectors. Credit: NASA/DOE/Fermi LAT Collaboration

The LAT Anti-Coincidence Detector with its Goddard and LAT Integration and Testing crews.

Chip Meegan next to some Fermi GBMs. Credit: GBM Team