AMEGO-X (for All-sky Medium-Energy Gamma-ray Observatory Explorer)
is a concept for a gamma-ray space observatory
It would sense the 100 keV to 1 GeV photon energy range,
over a wide field,
observing the entire sky several times a day.
The primary mission would be three years.
Its instruments are a gamma-ray detector that detects the
direction and energy of each photon, and an anti-coincidence detector.
The was proposed in 2021 as a NASAMIDEX mission,
but was not accepted.
Development of the plan has continued, aiming to propose it
as a future mission.