Analysis of Photometric Uncertainties in the OGLE-IV Galactic Bulge Microlensing Survey Data

作者：Skowron J^*; Udalski A; Kozlowski S; Szymanski M K; Mroz P; Wyrzykowski L; Poleski R; Pietrukowicz P; Ulaczyk K; Pawlak M; Soszynski I

来源：Acta Astronomica, 2016, 66(1): 1-13.

• Surveys
• Techniques: photometric
• Methods: data analysis
• Instrumentation: detectors
• Stars: variables: general
• Gravitational lensing

We present a statistical assessment of both, observed and reported, photometric uncertainties in the OGLE-IV Galactic bulge microlensing survey data. This dataset is widely used for the detection of variable stars, transient objects, discovery of microlensing events, and characterization of the exoplanetary systems. Large collections of RR Lyr stars and Cepheids discovered by the OGLE project toward the Galactic bulge provide light curves based on this dataset. We describe the method of analysis, and provide the procedure, which can be used to update preliminary photometric uncertainties, provided with the light curves, to the ones reflecting the actual observed scatter at a given magnitude and for a given CCD detector of the OGLE-IV camera. This is of key importance for data modeling, in particular, for the correct estimation of the goodness of fit.

• 出版日期2016