Cross-calibration of the energy response of the gamma-ray detectors on board GECAM-B

Context . The Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) was primarily designed to detect gamma-ray bursts (GRBs), particularly those associated with gravitational-wave events. The energy response of detectors plays a crucial role in detection performance and scientific data analysis. Aims . We applied the cross-calibration methodology to calibrate and optimize the energy response of the gamma-ray detectors (GRDs) on board GECAM-B, using eight GRBs that were jointly observed by GECAM-B and other well-calibrated instruments. These GRBs enable the comprehensive calibration of all GRDs with different incident angles. Methods . Cross-calibration using well-calibrated instruments is the most efficient way to verify the energy response of the detectors. The basic approach involves performing a joint spectral analysis and introducing a constant factor to quantify the difference in effective area between instruments. This calibration method has been widely used in the cross-calibration of many high-energy astrophysical instruments. Results . We completed the cross-calibration of all 25 GRDs, covering two electronics readout channels and different incidence angles. The results of the joint spectral fitting demonstrate that GECAM-B exhibits good consistency with the well-calibrated Fermi /GBM instrument. Furthermore, the GECAM-B energy response matrix accurately reproduces the observational data without requiring any corrections or modifications. Conclusions . Thanks to the broad energy band, accurate energy response, and anti-saturation design, GECAM-B can constrain spectral models and measure spectral parameters for not only typical bursts but also exceptionally bright events, including GRB 221009A and GRB 230307A, the two brightest GRBs ever detected.

Authors

Institutions

Publication Details

Journal
Astronomy and Astrophysics
Published
2025-07-24
DOI
https://doi.org/10.1051/0004-6361/202555228
Citations
1
Primary Topic
Nuclear Physics and Applications
Type
article
Field-Weighted Citation Impact
1.88

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Cross-calibration of the energy response of the gamma-ray detectors on board GECAM-B

Sheng-Lun Xie, KeWei Gong, Shuo Xiao, D. Y. Guo et al.
1 citations
Astronomy and Astrophysics
Nuclear Physics and Applications
1.88
article

Cross-calibration of the energy response of the gamma-ray detectors on board GECAM-B

Sheng-Lun Xie, KeWei Gong, Shuo Xiao, D. Y. Guo, Y. Zhao, Xinqiao Li, S. L. Xiong, S. J. Zheng, Rui Qiao, L. M. Song, Yanju Liu, Wen-Xi Peng, Ce Cai, Y. Huang, Xiao‐Bo Li, Ping Wang, Jin Wang, Xiaojing Liu, Zhen Zhang, Fan Zhang, Yanqiu Zhang, Chenwei Wang, Xiaoyun Zhao, Jinzhou Wang, Dali Zhang, Chao Zheng, Zhenghua An, Sheng Yang, Xi-Lei Sun, M. Gao, Qi-Bin Yi, J. He, Jia-Cong Liu, Xiang-Yang Wen
article en
1 citations

Abstract

Context . The Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) was primarily designed to detect gamma-ray bursts (GRBs), particularly those associated with gravitational-wave events. The energy response of detectors plays a crucial role in detection performance and scientific data analysis. Aims . We applied the cross-calibration methodology to calibrate and optimize the energy response of the gamma-ray detectors (GRDs) on board GECAM-B, using eight GRBs that were jointly observed by GECAM-B and other well-calibrated instruments. These GRBs enable the comprehensive calibration of all GRDs with different incident angles. Methods . Cross-calibration using well-calibrated instruments is the most efficient way to verify the energy response of the detectors. The basic approach involves performing a joint spectral analysis and introducing a constant factor to quantify the difference in effective area between instruments. This calibration method has been widely used in the cross-calibration of many high-energy astrophysical instruments. Results . We completed the cross-calibration of all 25 GRDs, covering two electronics readout channels and different incidence angles. The results of the joint spectral fitting demonstrate that GECAM-B exhibits good consistency with the well-calibrated Fermi /GBM instrument. Furthermore, the GECAM-B energy response matrix accurately reproduces the observational data without requiring any corrections or modifications. Conclusions . Thanks to the broad energy band, accurate energy response, and anti-saturation design, GECAM-B can constrain spectral models and measure spectral parameters for not only typical bursts but also exceptionally bright events, including GRB 221009A and GRB 230307A, the two brightest GRBs ever detected.

Astronomy and AstrophysicsVol. 701
Guizhou Normal University (CN), Central China Normal University (CN), Institute of High Energy Physics (CN), University of Chinese Academy of Sciences (CN), Dezhou University (CN), Xiangtan University (CN), Hebei Normal University (CN)
National Natural Science Foundation of China, Chinese Academy of Sciences, Hebei Normal University
Openalex Percentile: Top 14%
Nuclear Physics and Applications
1.88
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.