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The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is aChinese-French mission dedicated to the study of the transient sky. It isscheduled to start operations in 2024. ECLAIRs is a coded-mask telescope with alarge 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 ECLAIRstelescope underwent various calibration campaigns in vacuum test-chambers toevaluate its performance. Between 4 and 8 keV, the counting response of thedetection plane shows inhomogeneities between pixels from different productionbatches. The efficiency inhomogeneity is caused by low-efficiency pixels (LEPs)from one of the two batches, together with high-threshold pixels (HTPs) whosethreshold was raised to avoid cross-talk effects. In addition, some unexpectednoise was found in the detection plane regions close to the heat pipes. Westudy the impact of these inhomogeneities and of the heat-pipe noise at lowenergies on the ECLAIRs onboard triggers. We propose different strategies inorder to mitigate these impacts and to improve the onboard trigger performance.We analyzed the data from the calibration campaigns and performed simulationswith the ground model of the ECLAIRs trigger software in order to design andevaluate the different strategies. Most of the impact of HTPs can be correctedfor by excluding HTPs from the trigger processing. To correct for the impact ofLEPs, 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 andignoring their data in the 4--8 keV band during the data analysis.

Study of SVOM/ECLAIRs inhomogeneities in the detection plane below 8 keV and their mitigation for the trigger performances