GECAM卫星有效载荷介绍  

The GECAM and its payload

作　　者：李新乔[1] 文向阳 安正华[1] 徐岩冰[1] 梁晓华 杨生[1] 孙希磊[1] 刘晓静[1] 高旻[1] 汪锦州[1] 张大力[1] 龚轲[1] 刘雅清[1] 赵小芸[1] 彭文溪[1] 朱玥[1] 李刚[1] 乔锐[1] 郭东亚[1] 廖进元 卢红[1] 王辉[1] 李延国[1] 陈刚[1] 张帆[1] 熊少林[1] LI XinQiao;WEN XiangYang;AN ZhengHua;XU YanBing;LIANG XiaoHua;YANG Sheng;SUN XiLei;LIU XiaoJing;GAO Min;WANG JinZhou;ZHANG DaLi;GONG Ke;LIU YaQing;ZHAO Xiao Yun;PENG WenXi;ZHU Yue;LI Gang;QIAO Rui;GUO DongYa;LIAO Jin Yuan;LU Hong;WANG Hui;LI YanGuo;CHEN Gang;ZHANG Fan;XIONG ShaoLin(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《中国科学：物理学、力学、天文学》2020年第12期80-96,共17页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：中国科学院战略性先导科技专项(编号:XDA15360100,XDA15360102)资助项目。

摘　　要：引力波暴高能电磁对应体全天监测器(Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor,GECAM)卫星旨在实现对引力波事件的高能电磁对应体的全天监测,并监测全天的快速射电暴的高能辐射、特殊伽马暴以及磁星爆发等高能天体爆发事件,为相关的物理研究提供能谱、光变及定位等观测数据.GECAM由两颗共轨共轭运行的卫星组成,卫星均采用反地心指向,实现视场的全天覆盖.卫星有效载荷包括两种探测器:伽马射线探测器(Gamma-Ray Detector,GRD)和荷电粒子探测器(Charged Particle Detector,CPD).GRD采用溴化镧晶体匹配SiPM(Silicon PhotoMultiplier)技术探测8 keV–2 MeV的X/γ射线,通过两颗星多探头联合探测实现对伽马暴等爆发事件的定位;CPD利用塑料闪烁体匹配SiPM技术探测300 keV–5 MeV的荷电粒子,同GRD联合可鉴别和排除空间粒子事件.有效载荷的载荷处理器(Electronics Box,EBOX)具有在轨触发定位能力,将通过北斗短报文准实时下传触发时间和定位等信息,从而引导其他望远镜进行后随观测.The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM) monitors Gamma-Ray Bursts(GRBs) coincident with gravitational wave events over the whole sky. It also monitors other burst events, such as the high-energy radiation of fast radio bursts, various GRBs, and magnetar bursts. GECAM can measure the energy spectra, light curves, and location of all kinds of bursts. GECAM consists of two small satellites which operate in the same low earth orbit but in opposite geocentric directions. To obtain an all-sky field of view, the two satellites operate in opposite orbital phases. The GECAM payload includes two kinds of detectors: Charged Particle Detector(CPD) and Gamma-Ray Detector(GRD). Each GRD module consists of a La Br3:Ce scintillator and a Si PM array, and its gammaray detection range is 5 ke V–5 Me V. GECAM retrieves the locations of events such as GRBs through analyzing the data of the multiple GRDs on both satellites. Meanwhile, the CPD consists of a plastic scintillator and a Si PM array that detects charged particles of energies from 300 ke V to 5 Me V. The GECAM distinguishes the charged particle burst events in space by jointly analyzing the GRD and CPD data. The payload Electronic Box(EBOX) provides in-flight trigger and burst localization. The trigger and burst location data are transmitted by a Bei Dou Short Message system,which allows GECAM to guide other telescopes to do follow-up observations.

关 键 词：引力波事件 伽马暴 溴化镧 SIPM 在轨触发定位 

分 类 号：P142.84[天文地球—天体物理] P172.3[天文地球—天文学] P111