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Two New INTEGRAL Sources: IGR J15479-4529 and IGR J16418-4532

ATel #224; J. A. Tomsick and R. Lingenfelter (UC San Diego), S. Corbel (Universite Paris 7 and CEA Saclay), A. Goldwurm (CEA Saclay), and P. Kaaret (Harvard-Smithsonian CfA)
on 30 Jan 2004; 03:34 UT
Credential Certification: John A. Tomsick (jtomsick@ucsd.edu)

Subjects: X-ray, Black Hole, Cataclysmic Variable, Neutron Star

Referred to by ATel #: 779, 3174

We report on detections of two new INTEGRAL sources by the IBIS/ISGRI instrument during a 290 ks observation of the black hole X-ray transient 4U 1630-47 taken during 2003 February 1-5.

IGR J15479-4529 is detected at a significance of 17-sigma with coordinates R.A. = 15h47m.9 and Decl. = -45o29' (J2000, 2' uncertainty). Its 20-40 keV flux is 3 x 10^-11 erg/cm^2/s, using the current (OSA-3.0) ISGRI response matrix, and it is detected at a significance of 7-sigma in the 40-60 keV energy band. The best INTEGRAL source position is within 3' of the intermediate polar 1RXS J154814.5-452845, which was strongly detected by XMM-Newton out to 10 keV (Haberl, Motch, & Zickgraf 2002, A&A, 387, 201), suggesting a possible association.

IGR J16418-4532 has coordinates R.A. = 16h41m.8 and Decl. = -45o32' (J2000, 2' uncertainty). In the 20-40 keV band, it is detected at 17-sigma with a flux of 3 x 10^-11 erg/cm^2/s. This source is close to the Galactic plane (b = +0.5 degrees), and is one of several INTEGRAL sources that have been found in the Norma Region.