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Swift/XRT observations of INTEGRAL sources

ATel #1273; R. Landi, N. Masetti, L. Bassani (INAF/IASF Bologna), F. Capitanio, M. T. Fiocchi (INAF/IASF Rome), A. J. Bird, A. B. Hill (Univ. Southampton), N. Gehrels (NASA/GSFC), C. B. Markwardt (GSFC/UMD), M. Perri (ASDC)
on 13 Nov 2007; 12:51 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)

Subjects: Optical, X-ray, Gamma Ray, Request for Observations

We report the results of X-ray follow-up observations performed with Swift/XRT of six INTEGRAL sources belonging to the 3rd IBIS Survey Catalog (Bird et al. 2007, ApJS. 170, 175).

IGR J14298-6715
In the IBIS error box, we find a source at RA (J2000) = 14h 29m 59.56s and Dec(J2000) = -67d 14m 43.3s (4 arcsec uncertainty). It coincides with a ROSAT Faint Survey object (1RXS J142959.9-671447). There are two USNO-B1.0 sources within the XRT error box one of which is also a 2MASS object. The X-ray spectrum is described by a bremsstrahlung component with kT ~0.15 keV plus a flat (Gamma ~0.8) power law; the observed 2-10 keV flux is 2.6 x 10-12 erg cm-2 s-1.

IGR J14331-6112
The XRT observation locates the source at RA(J2000) = 14h 33m 07.89s and Dec(J2000) = -61d 15m 40.5s (4 arcsec uncertainty). This object is possibly associated to a USNO-B1.0/2MASS source having magnitude R~18.0.The X-ray spectroscopy indicates an unabsorbed flat (Gamma ~0.7) spectrum and a 2-10 keV flux of 4.5 x 10-12 erg cm-2 s-1.

IGR J14471-6414
In the IBIS error box, we detect a source at RA(J2000) = 14h 46m 27.79s and Dec(J2000) = -64h 16m 23.5s (3.7 arcsec uncertainty). It is associated to a ROSAT Faint Survey object (1RXS J144628.3-641627). There are two USNO-B1.0 sources within the XRT error box both of which are also listed in the 2MASS catalogue. The X-ray spectrum is described by an absorbed power law (NH ~4 x 1021 cm-2) having a photon index ~2 and an observed 2-10 keV flux of 4.8 x 10-12 erg cm-2 s-1.

IGR J17445-2747
Within the IBIS uncertainty, we find a source at RA(J2000) = 17h 44m 45.70s and Dec(J2000) = -27d 47m 30.1s (5.1 arcsec uncertainty). This object has a counterpart in the USNO-B1.0 (with magnitude R~12) and 2MASS catalogues. Due to the low quality of the X-ray data, we can infer only a 2-10 keV flux of ~1.5 x 10-13 erg cm-2 s-1.

IGR J18249-3243
The XRT observation locates a source at RA(J2000) = 18h 24m 56.11s and Dec = -32d 42m 58.9s (3.7 arcsec uncertainty). This object is likely associated to the radio source PKS 1821-327. It has a counterpart in the USNO-B1.0 catalogue (with magnitude R~15) and it is also listed in the 2MASS survey. The X-ray spectrum is modelled with an unabsorbed power law with a photon index ~1.6 and a 2-10 keV flux of 5.2 x 10-12 erg cm-2 s-1

IGR J18256-1035
Within the IBIS uncertainty there is a source at RA(J2000) = 18h 25m 43.85s and Dec(J2000) = -10d 35m 02.4s (4.1 arcsec uncertainty). This object is associated with an USNO-B1.0 source with magnitude R~ 18; no counterpart is listed in the 2MASS catalogue. The X-ray spectrum is best fitted with an unabsorbed flat (Gamma ~1) power law with a 2-10 keV flux of 2 x 10-12 erg cm-2 s-1.