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Large Area X-ray Propositional Counter (LAXPC) instrument on AstroSat isaimed at providing high time resolution X-ray observations in 3 to 80 keVenergy band with moderate energy resolution. To achieve large collecting area,a cluster of three co-aligned identical LAXPC detectors, is used to realize aneffective area in access of about 6000 cm2 at 15 keV. The large detectionvolume of the LAXPC detectors, filled with xenon gas at about 2 atmospherepressure, results in detection efficiency greater than 50%, above 30 keV. Inthis article, we present salient features of the LAXPC detectors, their testingand characterization in the laboratory prior to launch and calibration in theorbit. Some preliminary results on timing and spectral characteristics of a fewX-ray binaries and other type of sources, are briefly discussed to demonstratethat the LAXPC instrument is performing as planned in the orbit.

Large Area X-ray Proportional Counter (LAXPC) Instrument on AstroSat and Some Preliminary Results from its performance in the orbit