Localization Method for the Pointing Observation with the Collimated Telescopes of Insight-HXMT  

作　　者：Qi Luo Jin-Yuan Liao Yi Nang Cheng-Kui Li Chen Wang Na Sai Ju Guan Yu-Peng Chen Cheng-Cheng Guo Yuan Liu Shu Zhang Shuang-Nan Zhang 

机构地区：[1]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]School of Physics and Technology,Wuhan University,Wuhan 430072,China [5]WHU-NAOC Joint Center for Astronomy,Wuhan University,Wuhan 430072,China

出　　处：《Research in Astronomy and Astrophysics》2023年第5期38-43,共6页天文和天体物理学研究（英文版）

基　　金：a project funded by China National Space Administration(CNSA);the Chinese Academy of Sciences(CAS);supports from the National Key R&D Program of China(2021YFA0718500);the National Natural Science Foundation of China under Grant Nos.U1838202,U1838201,U2038102,and U1838113;the Youth Innovation Promotion Association of the CAS(Grant No.2018014);partially supported by International Partnership Program of Chinese Academy of Sciences(Grant No.113111KYSB20190020)。

摘　　要：An accurate target source position is sometimes useful for the pointing observation with the collimated telescopes of the Hard X-ray Modulation Telescope(Insight-HXMT),which is determined by the reliability of the instrumental response.Insight-HXMT has the unique design that all three main payloads(LE,ME and HE)consist of detector groups with three fields of views(FOVs)whose orientations differ by 60°.As the point-spread functions are different at different positions in the FOV coordinates,the count rate ratios between the detector groups depend on the position of an X-ray source in the FOVs.Based on the multi-FOV design,we develop a localization method for an X-ray source in the pointing observation of Insight-HXMT.The accuracy of the method is investigated with the pointing observations of the Crab with different exposures.We find that the statistical error decreases with the exposure,and the systematic error is dominant for the exposure>128 s.With the exposure of1024 s,the total error is 0°.015 for the Crab.This method can effectively distinguish the Rapid Burster H 1730–333and Slow Burster GX 354–0,which are only 0°.5 apart and can both contribute to bursts in the light curve obtained by Insight-HXMT.We also apply the pointing observation localization method to locate the X-ray counterpart of FRB 200428 with high precision.The located position is consistent with SGR J1935+2154 within 1σuncertainty of 10′,which provides important evidence that fast radio bursts can originate from magnetars.

关 键 词：INSTRUMENTATION detectors-space vehicles instruments-telescopes 

分 类 号：P111[天文地球—天文学]