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POLAR is a compact space-borne detector designed to perform reliablemeasurements of the polarization for transient sources like Gamma-Ray Bursts inthe energy range 50-500keV. The instrument works based on the ComptonScattering principle with the plastic scintillators as the main detectionmaterial along with the multi-anode photomultiplier tube. POLAR has beenlaunched successfully onboard the Chinese space laboratory TG-2 on 15thSeptember, 2016. In order to reliably reconstruct the polarization informationa highly detailed understanding of the instrument is required for both dataanalysis and Monte Carlo studies. For this purpose a full study of the in-orbitperformance was performed in order to obtain the instrument calibrationparameters such as noise, pedestal, gain nonlinearity of the electronics,threshold, crosstalk and gain, as well as the effect of temperature on theabove parameters. Furthermore the relationship between gain and high voltage ofthe multi-anode photomultiplier tube has been studied and the errors on allmeasurement values are presented. Finally the typical systematic error onpolarization measurements of Gamma-Ray Bursts due to the measurement error ofthe calibration parameters are estimated using Monte Carlo simulations.

In-Orbit Instrument Performance Study and Calibration for POLAR Polarization Measurements