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

Skowron J., Udalski A., Kozłowski S., Szymański M. K., Mróz P., Wyrzykowski Ł., Poleski R., Pietrukowicz P., Ulaczyk K., Pawlak M., Soszyński I.

Acta Astronomica

2016

Vol. 66, No. 1

1--13

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 exo-planetary 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.

The Optical Gravitational Lensing Experiment. Real Time Data Analysis Systems in the OGLE-III Survey

Udalski A.

Acta Astronomica

2003

Vol. 56, No. 4

291--305

We describe three real time data analysis systems implemented during the third phase of the OGLE survey (OGLE-III). The EWS system is designed to detect on-going microlensing events. The EEWS system monitors the microlensing phenomena for anomalies from the single mass microlensing. The NOOS system detects transient objects in the OGLE-III fields (SNe, microlensing events, variable stars) that normally are below the detection threshold. Information on objects detected by each of these systems is distributed to the astronomical community for follow up observations. Also a short description of the OGLE-III hardware and photometric data pipeline is presented.