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We propose a single TOO XMM follow-up observation of the faint hard X-ray transient that will revealed by the ART-XC telescope in the frame of the ongoing all-sky survey. The corresponding program is aimed at studies of the Very Faint X-ray Transients (VFXTs) detected both in X-rays with ART-XC and optics either during public surveys (ZTF GAIA etc.) or in dedicated observations. We will support this follow-up effort with ground-based optical telescopes of CMO SAI MSU RTT-150 and AZT-33IK telescopes as well as telescopes of the SAAO observatory in order to perform spectroscopic and photometric observations. The main purpose of this proposal and the joint X-ray-optical follow-up program is to constrain physical properties of the binary system and unveil the nature of the compact object. [truncated! Please see actual data for full text]

我们提议针对当前正在进行的全天巡天项目中由ART-XC望远镜探测到的暗弱硬X射线暂现源，开展一次单次机会目标（Target of Opportunity, TOO）XMM空间望远镜（XMM）后续观测。本配套项目旨在研究极暗弱X射线暂现源（Very Faint X-ray Transients, VFXTs）：这类源既可以通过ART-XC在X射线波段被探测到，也可在光学波段经由公共巡天（如兹威基瞬变设施（Zwicky Transient Facility, ZTF）、盖亚卫星（GAIA）等）或专属观测中被发现。我们将借助莫斯科州立大学施科贝尔岑天文研究所（CMO SAI MSU）的RTT-150、AZT-33IK地面光学望远镜，以及南非天文台（South African Astronomical Observatory, SAAO）的望远镜，开展光谱与测光观测以支撑本次后续研究工作。本申请及本次X射线-光学联合后续观测项目的核心目标，是限定该双星系统的物理属性，并揭示其致密天体的本质。[内容已截断，请查阅完整原文以获取全部信息]