The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a Chinese-French mission dedicated to the study of the transient sky. It is scheduled to start operations in 2024. ECLAIRs is a coded-mask telescope with a large field of view. It is designed to detect and localize gamma-ray bursts (GRBs) in the energy range from 4 keV up to 120 keV. In 2021, the ECLAIRs telescope underwent various calibration campaigns in vacuum test-chambers to evaluate its performance. Between 4 and 8 keV, the counting response of the detection plane shows inhomogeneities between pixels from different production batches. The efficiency inhomogeneity is caused by low-efficiency pixels (LEPs) from one of the two batches, together with high-threshold pixels (HTPs) whose threshold was raised to avoid cross-talk effects. In addition, some unexpected noise was found in the detection plane regions close to the heat pipes. We study the impact of these inhomogeneities and of the heat-pipe noise at low energies on the ECLAIRs onboard triggers. We propose different strategies in order to mitigate these impacts and to improve the onboard trigger performance. We analyzed the data from the calibration campaigns and performed simulations with the ground model of the ECLAIRs trigger software in order to design and evaluate the different strategies. Most of the impact of HTPs can be corrected for by excluding HTPs from the trigger processing. To correct for the impact of LEPs, an efficiency correction in the shadowgram seems to be a good solution. An effective solution for the heat-pipe noise is selecting the noisy pixels and ignoring their data in the 4--8 keV band during the data analysis.
The coded mask of the ECLAIRs telescope onboard the SVOM space mission
Université Paris Cité, CNRS, Astroparticule et Cosmologie（巴黎西岱大学，法国国家科学研究中心，粒子与宇宙学）；CEA Paris-Saclay, Institut de Recherche sur les lois Fondamentales de l’Univers（巴黎萨克雷原子能委员会，基础定律研究所）；CNES（法国国家空间研究中心）
Université Paris Cité（巴黎西岱大学）；CNRS（法国国家科学研究中心）；CEA（法国原子能和替代能源委员会）；Astroparticule et Cosmologie（粒子天体物理与宇宙学）；CEA Paris-Saclay（巴黎萨克雷CEA）；Irfu（法国原子能和替代能源研究院）；Département d’Astrophysique（天体物理学系）；AIM（物质、宇宙与辐射相互作用实验室）
ECLAIRs: the SVOM high-energy transient trigger camera
IRAP, Université de Toulouse/CNRS/CNES（图卢兹大学/法国国家科学研究中心/法国国家空间研究中心 IRAP）；CEA Paris-Saclay, Institut de Recherche sur les lois Fondamentales de l’Univers（巴黎-萨克雷原子能委员会基础定律研究所）；Université Paris Cité, CNRS, CEA, Astroparticule et Cosmologie（巴黎西岱大学/法国国家科学研究中心/法国原子能和替代能源署 粒子物理与宇宙学）；Laboratoire Universe et Particules de Montpellier, CNRS/IN2P3（蒙彼利埃宇宙与粒子实验室/法国国家科学研究中心/法国国家核子和粒子物理研究所）；CNES（法国国家空间研究中心）
The GRB joint scientific analysis pipeline of the ECLAIRs and GRM instruments on board SVOM
Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3（蒙彼利埃宇宙与粒子实验室，蒙彼利埃大学，法国国家科学研究中心/法国国家核子和粒子物理研究所）；Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris（索邦大学，法国国家科学研究中心，联合研究单位7095，巴黎天体物理学研究所）；Institut Universitaire de France（法兰西学院）；INAF –Osservatorio Astronomico di Brera（意大利国家天体物理研究所-布雷拉天文台）
SVOM/VT: Overview of data processing and GRB identifications with X-band data
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University（北京师范大学前沿交叉科学研究院）；School of Physics and Astronomy, Beijing Normal University（北京师范大学物理学院）
Early results from the SVOM Observatory Science program
Université Paris Cité, CNRS, Astroparticule et Cosmologie（巴黎西岱大学）；State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；IRAP, Université de Toulouse, CNRS, CNES（图卢兹大学）；CEA Paris-Saclay, IRFU/DAp-AIM（法国原子能和替代能源委员会）；Department of Astronomy, University of Science and Technology of China（中国科学技术大学）；Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS（斯特拉斯堡大学）
SVOM/VT: Instrument Overview, Science Objectives, and First-Year Performance
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences（中国科学院西安光学精密机械研究所）
