  Here we present the conceptual design of a wide field imager onboard a 6U
class CubeSat platform for the study of GRB prompt and afterglow emission and
detection of electromagnetic counterparts of gravitational waves in soft
X-rays. The planned instrument configuration consists of an array of X-ray
Hybrid CMOS detectors (HCD), chosen for their soft-X-ray response, flexible and
rapid readout rate, and low power, which makes these detectors well suited for
detecting bright transients on a CubeSat platform. The wide field imager is
realized by a 2D coded mask. We will give an overview of the instrument design
and the scientific requirements of the proposed mission.
