The trigger and localization system of SVOM-GRM
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866914512481812480 |
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| author | He, Jiang Sun, Jian-Chao Huang, Yue Dong, Yong-Wei Zheng, Shi-Jie Zhao, Xiao-Yun Gao, Min Li, Lu Liu, Jiang-Tao Liu, Xin Shi, Hao-Li Song, Li-Ming Tan, Wen-Jun Wu, Bo-Bing Wang, Chen-Wei Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Xiong, Shao-lin Zhang, Juan Zhang, Li Zhang, Shuang-Nan |
| author_facet | He, Jiang Sun, Jian-Chao Huang, Yue Dong, Yong-Wei Zheng, Shi-Jie Zhao, Xiao-Yun Gao, Min Li, Lu Liu, Jiang-Tao Liu, Xin Shi, Hao-Li Song, Li-Ming Tan, Wen-Jun Wu, Bo-Bing Wang, Chen-Wei Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Xiong, Shao-lin Zhang, Juan Zhang, Li Zhang, Shuang-Nan |
| contents | The Space multi-band Variable Object Monitor (SVOM) is an astronomical satellite jointly developed by China and France, primarily focused on the detection of gamma-ray bursts (GRBs) and transient sources. The SVOM satellite was launched on 22nd June, 2024 with four payloads installed onboard. As one of payload, GRM comprises 3 gamma-ray detectors (each detector has an effective area of approximately 200~cm$^{2}$) with distinct pointing directions, enabling the temporal and spectral measurements as well as localization of GRBs in the energy range of 15-5000 keV. This article firstly introduces the on-board localization algorithm design for GRM and presents preliminary test results. Then, leveraging abundant ground-based computational resources, a joint fitting method for spectral and localization analysis using Monte Carlo Markov Chain (MCMC) is implemented. In contrast to the on-board localization algorithm, the on-ground MCMC method comprehensively considers the influence of spectral characteristics, thereby mitigating systematic biases. Finally, a systematic analysis based on this method is provided, highlighting the localization and spectral measurement capabilities of GRM. The preliminary localization analysis result for the on-board detected GRB 240629A by both GRM and Fermi/GBM shows that the localization result (error$\sim$4.14$^{\circ}$) of GRM is consistent with the Fermi/GBM result. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_18018 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The trigger and localization system of SVOM-GRM He, Jiang Sun, Jian-Chao Huang, Yue Dong, Yong-Wei Zheng, Shi-Jie Zhao, Xiao-Yun Gao, Min Li, Lu Liu, Jiang-Tao Liu, Xin Shi, Hao-Li Song, Li-Ming Tan, Wen-Jun Wu, Bo-Bing Wang, Chen-Wei Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Xiong, Shao-lin Zhang, Juan Zhang, Li Zhang, Shuang-Nan Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena The Space multi-band Variable Object Monitor (SVOM) is an astronomical satellite jointly developed by China and France, primarily focused on the detection of gamma-ray bursts (GRBs) and transient sources. The SVOM satellite was launched on 22nd June, 2024 with four payloads installed onboard. As one of payload, GRM comprises 3 gamma-ray detectors (each detector has an effective area of approximately 200~cm$^{2}$) with distinct pointing directions, enabling the temporal and spectral measurements as well as localization of GRBs in the energy range of 15-5000 keV. This article firstly introduces the on-board localization algorithm design for GRM and presents preliminary test results. Then, leveraging abundant ground-based computational resources, a joint fitting method for spectral and localization analysis using Monte Carlo Markov Chain (MCMC) is implemented. In contrast to the on-board localization algorithm, the on-ground MCMC method comprehensively considers the influence of spectral characteristics, thereby mitigating systematic biases. Finally, a systematic analysis based on this method is provided, highlighting the localization and spectral measurement capabilities of GRM. The preliminary localization analysis result for the on-board detected GRB 240629A by both GRM and Fermi/GBM shows that the localization result (error$\sim$4.14$^{\circ}$) of GRM is consistent with the Fermi/GBM result. |
| title | The trigger and localization system of SVOM-GRM |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.18018 |