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All-sky monitors can measure the fluxes of astrophysical sources by measuringthe changes in observed counts as the source is occulted by the Earth. Suchmeasurements have typically been carried out by all-sky monitors like$\textit{CGRO}$-BATSE and $\textit{Fermi}$-GBM. We demonstrate for the firsttime the application of this technique to measure fluxes of sources using acollimated instrument: the Cadmium Zinc Telluride detector on$\textit{AstroSat}$. Reliable flux measurements are obtained for the Crabnebula and pulsar, and for Cyg X-1 by carefully selecting the best occultationdata sets. We demonstrate that CZTI can obtain such measurements for hardsources with intensities $\gtrsim1$Crab.

Using collimated CZTI as all sky X-ray detector based on Earth Occultation Technique