=======================================================================

               The Optical Gravitational Lensing Experiment.

       Optical Counterparts to the X-ray Sources in the Galactic Bulge

             A. Udalski, K. Kowalczyk, I. Soszynski, R. Poleski, 
           M.K. Szymanski, M. Kubiak, G. Pietrzynski, S. Kozlowski, 
         P. Pietrukowicz, K. Ulaczyk, J. Skowron and L. Wyrzykowski

=======================================================================
e-mail: udalski@astrouw.edu.pl



This directory contains OGLE data for optical counterpart candidates to
the X-ray sources detected by the Chandra survey of the Galactic bulge:
Galactic Bulge Survey - Jonker et al. 2011, ApJS, 194, 18.


The directory structure is as follows:

README                                - this file

OGLE-GBS_counterparts.txt             - cross-identification table between OGLE optical counterpart
                                        candidates and GBS X-ray sources (see Table 1 in the paper)

O-IV_phot/                            - subdirectory with OGLE-IV photometry of candidates

O-III_phot/                           - subdirectory with OGLE-III photometry of candidates

O-II_phot/                            - subdirectory with OGLE-II photometry of candidates

fcharts/                              - subdirectory with finding charts. 60" x 60" subframe
                                        of the OGLE I-band reference image. North is up and
                                        East to the left. 

paper.pdf                             - paper: Udalski, Kowalczyk, Soszynski et al., 2012,
                                        Acta Astronomica, 62, 133.

Any presentation of the scientific analysis or usage of the data from
this directory should include the appropriate reference(s) to OGLE
paper(s).