VizieR Online Data Catalog NuSTAR hard X-ray survey of the Galactic Center. II. (Hong+, 2016)

Observations of the GC region with NuSTAR began in 2012 July, shortly after launch. The original survey strategy for the GC region was to match the central 2x0.7 region covered by the Chandra X-ray Observatory (Wang et al. 2002Natur.415..148W; Muno et al. 2009, J/ApJS/181/110). The field of views (FOVs) of neighboring NuSTAR observations in the survey were designed to overlap with each other by ~40%. Multiple observations of the same region with relatively large FOV offsets tend to average out the vignetting effects of each observation, enabling a more uniform coverage of the region. Multiple observations are also suitable for monitoring long term X-ray variability of sources in the region. Even when observing a single target, the NuSTAR observation is often broken up into two or more segments with relatively large pointing offsets to allow an efficient subtraction of a detector coordinate-dependent background component (e.g., Mori et al. 2013ApJ...770L..23M). (4 data files).