THESEUS任务中的红外望远镜（IRT）
The IRT Telescope on board the THESEUS mission
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中文总结 AI 辅助
介绍THESEUS任务中的IRT望远镜，它是0.7米级，能在特定波段和视场成像及提供光谱，目标是识别GRB近红外对应体、测量光度红移并及时传至地面，便于大型望远镜后续观测，源亮时还能进行光谱分析。
中文摘要 AI 辅助
我们介绍了红外望远镜（IRT），它是THESEUS任务有效载荷的一部分，是欧洲航天局M7发射窗口（2037年发射）的三个A阶段候选任务之一。IRT是一台0.7米级望远镜，采用离轴柯施光学设计，在15×15角分视场的0.7 - 1.8微米范围内具备成像能力。它还在2×2角分的有限视场中，于0.8 - 1.6微米范围内提供无狭缝低分辨率光谱（R~400）。IRT的目标是识别THESEUS上另外两台望远镜（XGIS和SXI）探测到的伽马射线暴（GRB）的近红外对应体，并近乎实时地测量其光度红移。位置和红移将立即传输到地面，以便大型望远镜（如ELT、VLT等）进行更深入的后续观测。如果源足够亮，将进行光谱分析以表征GRB环境。
英文摘要
We present the Infra-Red Telescope (IRT), which is part of the payload of the THESEUS mission, one on the three phase A candidate missions for the M7 slot of ESA (launch date 2037). The IRT is a 0.7 m class telescope with an off-axis Korsch optical design, with imaging capabilities in the 0.7-1.8 microns range over a 15 x 15 arc min field of view. The IRT also provides slit-less low resolution spectroscopy (R~400) over a limited field of view of 2 x 2 arc min, in the 0.8-1.6 microns range. The goal of the IRT is to identify the near infrared counterparts to the Gamma-Ray Bursts (GRBs) detected by the two other telescopes on board THESEUS (the XGIS and the SXI), and to measure on board its photometric redshift in near real-time. The position and the redshift will be transmitted immediately to ground to allow for deeper follow-up by the large telescopes (ELT, VLT, ...). If the source is bright enough, spectroscopy will be performed to characterize the GRB environment.
