In-Orbit Calibration and Data Analysis of China＇s First Grazing Incidence Focusing X-Ray Pulsar Telescope

The grazing incidence focusing X-ray pulsar telescope（iFXPT）, as the main payload of the X-ray Pulsar Navigation Test Satellite（XPNAV-1）, will have great significance on China＇s space scientific exploration and X-ray pulsar navigation. With PSR B0531＋21（Crab Pulsar） as the observation target, the pulsar profile has been recovered based on the data obtained by iFXPT, realizing the main objective of ＂observing＂ PSR B0531＋21 for the first time in China. This payload mainly consists of the Wolter-I X-ray optics, silicon drift detector, magnetic deflector, electronics, high-energy particle shield and high-stability structures. Currently, the iFXPT, with its good in-orbit performance, has obtained a considerable observation data. The effective area, sensitivity and energy response have been calibrated both on ground and in-orbit, demonstrating a high degree of consistency. Meanwhile, the in-orbit observation data and information for pulsar navigation has also been analyzed simultaneously. As a result, the feasibility of the exploration scheme and the performance of the telescope have been fully validated.