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In-orbit background simulation study of SVOM/GRM

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Abstract

The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a Chinese-French satellite dedicated to the observation and study of Gamma-Ray Bursts (GRBs) and other variable sources. Among the four scientific payloads onboard SVOM, the Gamma-Ray Monitor (GRM) is designed to detect GRBs in the 15 keV to 5 MeV energy range. The final performance of GRM can be affected by the space environment background during the flight. In this paper, the authors present the in-orbit background simulation results by using the GEANT4 Monte-Carlo simulation toolkit. Additionally, we studied the Earth occultation effect of the space background due to the anti-solar pointing strategy of SVOM. The total background count rate of each spectrometer of GRM fluctuates between about 840 counts/s and 1341 counts/s, and is dominated by the cosmic X-ray background. Finally, we discuss the emission lines of the background and their potential use for in-orbit calibration of GRM. Our simulation study results can help to understand the impact of the space radiation environment on GRM with the latest geometrical model and can be further compared and updated with the real in-orbit measurement in the future.

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Notes

  1. http://geant4.web.cern.ch/.

  2. https://www.spenvis.oma.be/.

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Acknowledgements

The authors thank support from the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA15060303), the National Key Research and Development Program of China (Grant No. 2016YFA0400800), the Joint Research Fund in Astronomy under the cooperative agreement between the National Natural Science Fundation of China and the Chinese Academy of Sciences (Grant No. U1631242), the National Basic Research Program (973 Program) of China (Grant No. 2014CB845800), and the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2014009).

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Authors and Affiliations

  1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Jiang He, Jian-Chao Sun, Xing Wen, Yong-Wei Dong, Juan Zhang, Lu Li, Jiang-Tao Liu, Xin Liu, Hao-Li Shi, Bo-Bing Wu, Ling-Jun Wang, Rui-Jie Wang, Li Zhang & Shuang-Nan Zhang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jiang He, Xing Wen, Xin Liu, Bo-Bing Wu & Shuang-Nan Zhang

  3. Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai, 201210, China

    Shuang Liu, Yang Liu, Wen-Qiao Zhang & Yan-Yan Zhao

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  1. Jiang He
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Correspondence to Jiang He.

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He, J., Sun, JC., Wen, X. et al. In-orbit background simulation study of SVOM/GRM. Astrophys Space Sci 365, 167 (2020). https://doi.org/10.1007/s10509-020-03880-9

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