Small Spacecraft Payload Study for X-ray Astrophysics including GRB Science

This paper presents microsatellite spacecraft payload study for prompt observation of transient astrophysical objects in X-ray energy range. By combining telescope concepts and miniaturized detectors, the small will be able to probe temporal emissions bright events such as Gamma-Ray Bursts (GRBs), transients or electromagnetic counterparts Gravitational Wave Events (GWEs), but also short long term observations other types variable sources. The is based on CubeSat nanosatellite platform with a volume 16U. carries two telescopes onboard. first intended monitoring localization, second detailed spectroscopic observation. monitor/localization wide field view several arc degrees used localization flux measurement transients, well permanent Galactic center area. Lobster Eye optics together pixel detector Timepix3 Quad detector. Rapid follow-up by soft spectroscopy enabled limited FOV (Field View) arcmins no spatial and/or angular resolution. uses condenser replicated parabolic total reflection system (or, alternatively, Wolter system) Ketek SDD resolution about 130 eV In addition technical instrumental aspects, observational strategy issues justifications are addressed paper.