THE INVESTIGATION OF THE ERROR BOXES OF KVANT AND GRANAT X-RAY SOURCES IN THE REGION OF GALACTIC-CENTER

The error circles of ten X-ray sources are investigated at optical and infrared wavelengths using Palomar sky survey plates, and deep photog raphic survey plates obtained with the UK Schmidt telescope at the Ang lo-Australian observatory. The objects were cross-identified with the catalogs of variable stars, IRAS point sources and Einstein of X-ray s ources in the same sky region. As expected, very strong interstellar d ust absorption is typical for all the X-ray source fields. Variable st ar No 2547 from the list by Terzan and Gosset (1992) was found to be l ocated near the southern boundary of the KS 1731-260 error circle. The star is identified with the source IRAS.17311-2604, and varies from 1 6(m) to fainter than 20(m) on our r-band plates. IRAS 17342-2908 and a nother infrared source 358.83+1.39 discovered by Kawara et al. (1983) at 2.21 mu m are located near the error box of GRS 1734-292. We have f ound an optical counterpart for these infrared sources, the star is ve ry red and bright in the near infrared with no signs of high amplitude light variations. It may be a highly reddened OB-star. As in the prev ious case, the positions of IRAS 17342-2908 and infrared source 358.83 +139, were found to coincide with a red star also bright in the near i nfrared and al these objects are covered by the error circle of GRS 17 36-297. The error circle of KS 1741-293 is covered by both error boxes of IRAS 17417-2919 and of FIR 5, a far infrared source discovered ear lier by Odenwald and Fazio (1984) at 40-250m wavelength band. The latt er object is known to be extended with the diameter of 2.'7 +/- 0.'6 a nd coincides with the radio source G 359.54-068 also known to be exten ded with the diameter of 2'90. No trace of an optical counterpart to t his object is seen on optical and near infrared plates, and there are no highly reddened star in the error box. The center of highly reddene d globular cluster Terzan 6 is located on the south-western boundary o f the 95 arcsecond diameter error circle of GRS 1747-312. On the deep infrared UKST plates the cluster is seen to extend inside the error ci rcle. So this may be another association of a globular cluster with an X-ray source. Optical photographic reproductions of error circles and their neighborhood are presented, some stars with outstanding blue or red colors are marked.