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The Chandra High Resolution Camera observed the fields of five hard X-raysources in order to help us obtain X-ray coordinates with sub-arcsecondprecision. These observations provide the most accurate X-ray positions knownfor IGR J16393-4643 and for IGR J17091-3624. The obscured X-ray pulsar IGRJ16393-4643 lies at R.A. (J2000) = 16:39:05.47, and Dec. = -46:42:13.0 (errorradius of 0.6" at 90% confidence). This position is incompatible with thepreviously-proposed counterpart 2MASS J16390535-4642137, and it points insteadto a new counterpart candidate that is possibly blended with the 2MASS star.The black hole candidate IGR J17091-3624 was observed during its 2011 outburstproviding coordinates of R.A. = 17:09:07.59, and Dec. = -36:24:25.4. Thisposition is compatible with those of the proposed optical/IR and radiocounterparts, solidifying the source's status as a microquasar. Three targets,IGR J14043-6148, IGR J16358-4726, and IGR J17597-2201, were not detected. Weobtained 3{\sigma} upper limits of, respectively, 1.7, 1.8, and 1.5 \times10^-12 erg cm^-2 s^-1 on their 2-10 keV fluxes.

Chandra observations of five INTEGRAL sources: new X-ray positions for IGR J16393-4643 and IGR J17091-3624