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A fleet of nanosatellites using precise timing synchronization provided bythe Global Positioning System is a new concept for monitoring the gamma-ray skythat can achieve both all-sky coverage and good localization accuracy. We areproposing this new concept for the mission CubeSats Applied for MEasuring andLOcalising Transients (CAMELOT). The differences in photon arrival times ateach satellite are to be used for source localization. Detectors with goodphoton statistics and the development of a localization algorithm capable ofhandling a large number of satellites are both essential for this mission.Large, thin CsI scintillator plates are the current candidates for thedetectors because of their high light yields. It is challenging to maximize thelight-collection efficiency and to understand the position dependence of suchthin plates. We have found a multi-channel readout that uses the coincidencetechnique to be very effective in increasing the light output while keeping asimilar noise level to that of a single channel readout. Based on such adetector design, we have developed a localization algorithm for this missionand have found that we can achieve a localization accuracy better than 20 arcminutes and a rate of about 10 short gamma-ray bursts per year.

CAMELOT: design and performance verification of the detector concept and localization capability