The study of GRB prompt emissions (PE) is one of the main goals of the Lomonosov space mission. The payloads of the GRB monitor (BDRG) with the wide-field optical cameras (SHOK) and the ultra-fast flash observatory (UFFO) onboard the Lomonosov satellite are intended for the observation of GRBs, and in particular, their prompt emissions. The BDRG gamma-ray spectrometer is designed to obtain the temporal and spectral information of GRBs in the energy range of 10–3000 keV as well as to provide GRB triggers on several time scales (10 ms, 1 s and 20 s) for ground and space telescopes, including the UFFO and SHOK. The BDRG instrument consists of three identical detector boxes with axes shifted by 90∘$90^{\circ}$ from each other. This configuration allows us to localize a GRB source in the sky with an accuracy of ∼2∘$\sim 2^{\circ}$.Each BDRG box contains a phoswich NaI(Tl)/CsI(Tl) scintillator detector. A thick CsI(Tl) crystal in size of ∅130×17mm$\varnothing 130 \times 17~\mbox{mm}$ is placed underneath the NaI(Tl) as an active shield in the soft energy range and as the main detector in the hard energy range. The ratio of the CsI(Tl) to NaI(Tl) event rates at varying energies can be employed as an independent metric to distinguish legitimate GRB signals from false positives originating from electrons in near-Earth vicinities.The data from three detectors are collected in a BA BDRG information unit, which generates a GRB trigger and a set of data frames in output format. The scientific data output is ∼500$\sim 500$ Mb per day, including ∼180$\sim 180$ Mb of continuous data for events with durations in excess of 100 ms for 16 channels in each detector, detailed energy spectra, and sets of frames with ∼5$\sim 5$ Mb of detailed information for each burst-like event. A number of pre-flight tests including those for the trigger algorithm and calibration were carried out to confirm the reliability of the BDRG for operation in space.

中文翻译：

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宽场伽马光谱仪 BDRG：罗蒙诺索夫任务中的 GRB 监视器

GRB瞬发发射（PE）的研究是罗蒙诺索夫太空任务的主要目标之一。罗蒙诺索夫卫星上装有广角光学相机 (SHOK) 和超快闪光天文台 (UFFO) 的 GRB 监视器 (BDRG) 的有效载荷用于观测 GRB，特别是它们的快速发射。BDRG 伽马射线能谱仪旨在获取 10-3000 keV 能量范围内 GRB 的时间和光谱信息，并在多个时间尺度（10 ms、1 s 和 20 s）上为地面和太空望远镜，包括 UFFO 和 SHOK。BDRG 仪器由三个相同的检测器盒组成，轴彼此偏移 90∘$90^{\circ}$。这种配置使我们能够以 ~2∘$\sim 2^{\circ}$ 的精度定位天空中的 GRB 源。每个 BDRG 盒包含一个 phoswich NaI(Tl)/CsI(Tl) 闪烁体探测器。将尺寸为 ∅130×17mm$\varnothing 130 \times 17~\mbox{mm}$ 的厚 CsI(Tl) 晶体放置在 NaI(Tl) 下方作为软能量范围内的有源屏蔽和主探测器在硬能量范围内。不同能量下 CsI(Tl) 与 NaI(Tl) 事件率的比率可用作独立度量，以区分合法的 GRB 信号与源自近地附近电子的假阳性。来自三个探测器的数据收集于一个BA BDRG信息单元，它产生一个GRB触发器和一组输出格式的数据帧。科学数据输出为每天 ~500$\sim 500$Mb，包括 ~180$\sim 180$Mb 的连续数据，用于每个探测器中 16 个通道的持续时间超过 100 毫秒的事件、详细的能谱、和一组帧，其中包含每个突发事件的 ∼5$\sim 5$ Mb 详细信息。进行了包括触发算法和校准在内的一系列飞行前测试，以确认 BDRG 在太空运行的可靠性。