出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The SPI-ACS is an important component in the InterPlanetary Network, which utilizes Gammaray satellites to localize Gamma Ray Bursts through triangulation. For this purpose, it is important to know the accuracy of the ACS onboard clock. The SPI germanium detectors use a different clock, therefore we can calibrate the ACS clock with the SPI detector clock. In this study we use high energy cosmic-ray events which cause spikes in the ACS and at the same time saturate one or more SPI germanium detectors. We collect such events from more than 900 revolutions, obtain the distribution of the time difference between ACS spikes and corresponding SPI saturations, and compare the result with a Monte-Carlo simulation. We conclude that the ACS on board clock does not have significant drift with respect to the SPI detector clock.
