SIMBAD references

J. A. Tomsick and R. Lingenfelter, University of California at San Diego; R. Walter, INTEGRAL Science Data Centre; J. Rodriguez and A. Goldwurm, Commissariat a l'Energie Atomique (CEA), Saclay; S. Corbel, Universite Paris 7 and CEA, Saclay; and P. Kaaret, Harvard-Smithsonian Center for Astrophysics, report the detection of a variable hard x-ray source, IGR J16320-4751, with the IBIS instrument's ISGRI detector onboard the INTEGRAL satellite. The source was detected at R.A. = 16h32m.0, Decl. = -47o51' (equinox 2000.0; uncertainty 2') during an observation of 4U 1630-47 on Feb. 1.4 UT. The 15-40-keV source flux varies from < 10 to 50 mCrab on a time scale of 1000 s, and the source was detected above 60 keV. The position is consistent with that of the source AX J1631.9-4752 (detected during ASCA observations in 1994 and 1997). The ASCA/GIS source count rate varies by a factor of 4 during the 14000-s 1997 observation, and Sugizaki et al. (2001, Ap.J. Suppl. 134, 77) fit the GIS energy spectrum with an absorbed power law with a photon index of 0.2 ± 0.2 and a hydrogen column density of (9 ± 1) x 10**22 cm**-2, finding a mean 0.7-10-keV flux near 5 x 10**-11 erg cm**-2 s**-1. The hard power-law index may suggest that the source is a high-mass x-ray binary, indicating that it may be possible to identify the source at other wavelengths.