SIMBAD references

C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC); and J. H. Swank, GSFC, write: "The best x-ray position of the transient XTE J1720-318, derived from RXTE PCA scans on Jan. 15.06 UT, is R.A. = 17h20m00s, Decl. = -31o44'.8 (equinox 2000.0). The estimated systematic uncertainty is 0'.5, consistent with the radio position (IAUC 8054). The x-ray flux declined 30 percent between Jan. 14 and 19, from a maximum of 1.0 x 10**-8 erg cm**-2 s**-1 (2-10 keV). The soft spectrum and low high-frequency variability are consistent with the high soft states of black-hole candidates."