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The soft MeV gamma-ray sky, from a few hundred keV up to several MeV, is oneof the least explored regions of the electromagnetic spectrum. The mostpromising technology to access this energy range is a telescope that usesCompton scattering to detect the gamma rays. Going from the measured data toall-sky images ready for scientific interpretation, however, requires awell-understood detector setup and a multi-step data-analysis pipeline. We havedeveloped these capabilities for the Compton Spectrometer and Imager (COSI).Starting with a deep understanding of the many intricacies of the Comptonmeasurement process and the Compton data space, we developed the tools toperform simulations that match well with instrument calibrations and toreconstruct the gamma-ray path in the detector. Together with our work tocreate an adequate model of the measured background while in flight, we areable to perform spectral and polarization analysis, and create images of thegamma-ray sky. This will enable future telescopes to achieve a deeperunderstanding of the astrophysical processes that shape the gamma-ray sky fromthe sites of star formation (26-Al map), to the history of core-collapsesupernovae (e.g. 60-Fe map) and the distributions of positron annihilation(511-keV map) in our Galaxy.

COSI: From Calibrations and Observations to All-sky Images