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INTEGRAL observes IGR J17464-3213 in the soft state

ATel #180; P. Kretschmar (ISDC, Geneva & MPE, Garching), J. Chenevez (DSRI, Copenhagen), F. Capitanio (IASF/CNR, Roma), A. Orr (ESTEC, Noordwijk), G. Palumbo (Universita degli Studi di Bologna), S. Grebenev (IKI, Moscow)
on 21 Aug 2003; 18:16 UT
Credential Certification: Peter Kretschmar (Peter.Kretschmar@obs.unige.ch)

Subjects: X-ray, Gamma Ray, Black Hole, Transient

Referred to by ATel #: 189

The X-ray transient and black hole candidate IGR J17464-3213 (ATEL #132) = H1743-322, XTE J1746-322 (ATEL #133, #136) has been observed again during the Galactic Center Deep Exposure of the INTEGRAL Core Program.

Compared to previous INTEGRAL observations the source has now changed to a soft state and is visible with the JEM-X monitor. The source fluxes were ~400 mCrab and ~120 mCrab in the energy ranges 4-6 and 6-10 keV respectively. No significant flux was detected above 20 keV neither with JEM-X nor with IBIS/ISGRI. The JEM-X spectrum can be described by a blackbody model with kT~0.88+-0.07 keV using a fixed absorption value of 2.5e22 derived from earlier observations. No power law tail is required to fit the JEM-X data.

From the JEM-X observations the source position is found to be R.A. = 17h46.3m, Decl. = -32o14.4' with an uncertainty of 0.5'. This is consistent with the VLA position reported in ATEL #137.