Chandra HRC Localization of the Low-Mass X-Ray Binaries X1624-490 and X1702-429: The Infrared Counterparts

We report on the precise localization of the low-mass X-ray binariesX1624-490 and X1702-429 with the Chandra HRC-I. We determine the best positions to be 16h28m02.825s-49deg11'54.61" and17h06m15.314s-43deg02'08.69" (J2000.0) for X1624-490 andX1702-429, respectively, with the nominal Chandra positional uncertainty of 0.6". We also obtained deep IR observations of the fields of these sources in an effort to identify the IR counterparts. A single, faint(Ks=18.3+/-0.1) source is visible inside the Chandra error circle of X1624-490, and we propose this source as its IR counterpart.For X1702-429, a Ks=16.5+/-0.07 source is visible at the edge of the Chandra error circle. The brightness of both counterpart candidates is comparable to that of other low-mass X-ray binary IR counterparts when corrected for extinction and distance.