SIMBAD references

We report on the ROSAT HRI observations of three Galactic Center hard X-ray sources discovered by the ART-P/SIGMA experiments aboard the GRANAT satellite, namely GRS1734-292, GRS1747-341, and GRS1743-290. We found a possible counterpart for GRS1734-292 located at a position α=17h37m28.2s and δ= -29deg08'03.1" (equinox 2000) with an associated error radius of 3arcsec (90% confidence level). The HRI X-ray flux is consistent with previous measurements by ART-P. This variable source was also clearly detected during two PSPC pointed observations of the Galactic Center region. Although the significance of our detection is low (∼3σ), we may have also an X-ray counterpart for the persistent SIGMA source GRS1747-341; its position would be α=17h50m55.0s and δ=-34d11'37.0" (equinox 2000) with an associated error radius of 5.5arcsec (90% confidence level). On the other hand, we failed to detect GRS1743-290; another source which displays persistent emission in the SIGMA hard X-ray band. This result is consistent with the source being highly absorbed as suggested by previous observations.