七年Swift-XRT点源目录（1 SWXRT）
The seven year Swift-XRT point source catalog (1SWXRT)
摘要：
雨燕是一个多波长天文台，专门为伽马射线暴天文学设计，自2004年以来一直在运行。斯威夫特也是一个非常灵活的多用途设施，支持广泛的科学领域，如活动星系核，超新星，激变变量，银河瞬变，活动恒星和彗星。Swift X射线望远镜（XRT）在其运行的前七年中收集了超过150 M的观测数据。我们提出了在Swift操作的前七年期间以光子计数模式拍摄的XRT成像数据中检测到的所有X射线点源的列表。除了伽马射线暴（GRB）之外，所有这些点状源都将被存储在一个公开可用的目录（1 SWXRT）中。我们考虑了2005-2011年期间曝光时间> 500 s的所有XRT观测结果。用标准技术对数据进行了简化和分析，并编制了每项观测的检测源清单。进行了仔细的目视检查，以去除延伸的、虚假的和堆积的源。计算了位置、计数率、通量和相应的不确定度。我们已经分析了超过35，000个XRT场，曝光范围在500 s和100 ks之间，总曝光时间为140 Ms。目录包括~ 89，000个条目，其中近85，000个不受堆积影响，不是GRB。由于许多XRT场被观测了几次，我们总共有大约36，000个不同的天体源。我们计算了三个能量带的计数率：0.3-10 keV（全，或F），0.3-3 keV（软，或S）和2-10 keV（硬，或H）。每个条目在这些带中的至少一个中具有检测。特别地，我们在F、S和H波段分别检测到~ 80，000、~ 70，000和~ 25，500 $。将计数率转换为0.5-10、0.5-2和2-10 keV波段的通量。一些可能的科学用途的目录也突出显示。
英文摘要：
Swift is a multi-wavelength observatory specifically designed for gamma-ray burst (GRB) astronomy that is operational since 2004. Swift is also a very flexible multi-purpose facility that supports a wide range of scientific fields such as active galactic nuclei, supernovae, cataclysmic variables, Galactic transients, active stars and comets. The Swift X-ray Telescope (XRT) has collected more than 150 Ms of observations in its first seven years of operations. We present the list of all the X-ray point sources detected in XRT imaging data taken in photon counting mode during the first seven years of Swift operations. All these point-like sources, excluding the Gamma-Ray Bursts (GRB), will be stored in a catalog publicly available (1SWXRT). We consider all XRT observations with exposure time > 500 s taken in the period 2005-2011. Data were reduced and analyzed with standard techniques and a list of detected sources for each observation was produced. A careful visual inspection was performed to remove extended, spurious and piled-up sources. Positions, count rates, fluxes and the corresponding uncertainties were computed. We have analyzed more than 35,000 XRT fields, with exposures ranging between 500 s and 100 ks, for a total exposure time of 140 Ms. The catalog includes ~ 89,000 entries, of which almost 85,000 are not affected by pile-up and are not GRBs. Since many XRT fields were observed several times, we have a total of ~36,000 distinct celestial sources. We computed count rates in three energy bands: 0.3-10 keV (Full, or F), 0.3-3 keV (Soft, or S) and 2-10 keV (Hard, or H). Each entry has a detection in at least one of these bands. In particular, we detect ~ 80,000, ~ 70,000 and ~ 25,500$ in the F, S and H band, respectively. Count rates were converted into fluxes in the 0.5-10, 0.5-2 and 2-10 keV bands. Some possible scientific uses of the catalog are also highlighted.
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