Detector performance of the Gamma-ray Transient Monitor onboard DRO-A Satellite. (arXiv:2401.07513v1 [astro-ph.IM])

Detector performance of the Gamma-ray Transient Monitor onboard DRO-A Satellite. (arXiv:2401.07513v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Feng_P/0/1/0/all/0/1">Pei-Yi Feng</a> (1, 2), <a href="http://arxiv.org/find/astro-ph/1/au:+An_Z/0/1/0/all/0/1">Zheng-Hua An</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_D/0/1/0/all/0/1">Da-Li Zhang</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_C/0/1/0/all/0/1">Chen-Wei Wang</a> (1 and 2), <a href="http://arxiv.org/find/astro-ph/1/au:+Zheng_C/0/1/0/all/0/1">Chao Zheng</a> (1 and 2), <a href="http://arxiv.org/find/astro-ph/1/au:+Yang_S/0/1/0/all/0/1">Sheng Yang</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Xiong_S/0/1/0/all/0/1">Shao-Lin Xiong</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_J/0/1/0/all/0/1">Jia-Cong Liu</a> (1 and 2), <a href="http://arxiv.org/find/astro-ph/1/au:+Li_X/0/1/0/all/0/1">Xin-Qiao Li</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Gong_K/0/1/0/all/0/1">Ke Gong</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_X/0/1/0/all/0/1">Xiao-Jing Liu</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Gao_M/0/1/0/all/0/1">Min Gao</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Wen_X/0/1/0/all/0/1">Xiang-Yang Wen</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+liu_Y/0/1/0/all/0/1">Ya-Qing liu</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Zhao_X/0/1/0/all/0/1">Xiao-Yun Zhao</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_F/0/1/0/all/0/1">Fan Zhang</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Sun_X/0/1/0/all/0/1">Xi-Lei Sun</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Lu_H/0/1/0/all/0/1">Hong Lu</a> (1) ((1) Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China, (2) University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China, (3) State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China)

Gamma-ray Transient Monitor (GTM) is an all-sky monitor onboard the Distant
Retrograde Orbit-A (DRO-A) satellite with the scientific objective of detecting
gamma-ray transients ranging from 20 keV to 1 MeV. GTM is equipped with 5
Gamma-ray Transient Probe (GTP) detector modules, utilizing the NaI(Tl)
scintillator coupled with a SiPM array. To reduce the SiPM noise, GTP makes use
of a dedicated dual-channel coincident readout design. In this work, we firstly
studied the impact of different coincidence times on detection efficiency and
ultimately selected the 500 ns time coincidence window for offline data
processing. To test the performance of GTPs and validate the Monte Carlo
simulated energy response, we conducted comprehensive ground calibration tests
using Hard X-ray Calibration Facility (HXCF) and radioactive sources, including
energy response, detection efficiency, spatial response, bias-voltage response,
and temperature dependence. We extensively presented the ground calibration
results, and validated the design and mass model of GTP detector. These work
paved the road for the in-flight observation and science data analysis.

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