The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to survey the gamma-ray sky from 20 MeV to several hundreds of GeV. In this energy band there are no astronomical sources with sufficiently well known and sharp spectral features to allow an absolute calibration of the LAT energy scale. However, the geomagnetic cutoff in the cosmic ray electron-plus-positron (CRE) spectrum in low earth orbit does provide such a spectral feature. The energy and spectral shape of this cutoff can be calculated with the aid of a numerical code tracing charged particles in the Earth's magnetic field. By comparing the cutoff value with that measured by the LAT in different geomagnetic positions, we have obtained several calibration points between ~6 and ~13 GeV with an estimated uncertainty of ~2%. An energy calibration with such high accuracy reduces the systematic uncertainty in LAT measurements of, for example, the spectral cutoff in the emission from gamma ray pulsars.
The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration
费米大面积望远镜（Fermi Large Area Telescope，Fermi-LAT，以下简称LAT）是费米伽马射线太空望远镜（Fermi Gamma-ray Space Telescope，Fermi）任务的主要仪器，是一个成像，宽视场，高能γ射线望远镜，覆盖能量范围从20 MeV到300 GeV以上。在飞行任务的头几年，LAT团队对仪器的飞行性能有了相当深入的了解。因此，我们更新了用于减少LAT数据的分析以供公开发布，以及仪器响应函数（IRF），即为数据分析提供的仪器性能描述。在本文中，我们描述了这些更新的动机的影响。此外，我们还讨论了我们最初是如何从蒙特卡罗模拟中推导出IRF的，以及后来如何根据飞行数据和模拟数据之间的差异对这些IRF进行校正的。我们还给出了使用飞行数据进行验证的细节，并量化了IRFs中的剩余不确定性。最后，我们描述的技术LAT团队已经开发出传播这些不确定性的系统误差的估计，如通量和光谱的天体物理源的共同测量。
Updated in-flight calibration of the Hayabusa2/NIRS3 spectrometer: new global near-infrared photometric properties of asteroid (162173) Ryugu
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)（宇宙科学研究所（ISAS），日本宇宙航空研究开发机构（JAXA））；Instituto de Astrofísica de Canarias (IAC)（加那利天体物理学研究所 (IAC)）；Department of Astrophysics, University of La Laguna（拉帕尔马大学天体物理系）；Department of Earth and Planetary Science, The University of Tokyo（东京大学地球行星科学系）；LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, CY Cergy Paris Université（巴黎天文台 LIRA，PSL 大学，索邦大学，巴黎西岱大学，法国国家科学研究中心，CY 塞吉巴黎大学）
The Cosmic Infrared Background Experiment-2: An Intensity Mapping Optimized Sounding-rocket Payload to Understand the Near-IR Extragalactic Background Light
