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Swift/XRT follow-up of the unidentified INTEGRAL source IGR J14043-6148

ATel #3184; R. Landi, A. Malizia (INAF/IASF Bologna), A. Bazzano, M. Fiocchi (INAF/IASF Rome), A. J. Bird (Univ. Southampton), N. Gehrels (NASA/GSFC)
on 23 Feb 2011; 14:38 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)

Subjects: X-ray

We report the results of an X-ray follow-up observation performed with Swift/XRT of the unidentified INTEGRAL source IGR J14043-6148 listed in the 4th IBIS Survey Catalogue (Bird et al. 2010, ApJS, 186, 1).

Inside the 90% IBIS error circle, we find an X-ray source detected at 6.5 sigma c.l. (0.3-10 keV), which is still observed at 6.1 sigma c.l. above 3 keV. It is positioned at R.A.(J2000) = 14h 04m 29.63s and Dec.(J2000) = -61d 47m 19.7s (4.5 arcsec uncertainty). Within the XRT positional uncertainty, we find a USNO-B1.0 object (USNO-B1.0 0282-0474947) having magnitudes R ~18.5 and B ~20, which is also reported in the 2MASS/GLIMPSE catalogue (16, 13, 11 and 8 magnitudes in J, H, K and 8micron, respectively). The XRT location is also compatible with a non thermal radio source (G311.45-0.13) having a 6 cm flux of 0.5 Jy (Caswell & Barnes, 1985, MNRAS, 216, 753); this object is slightly resolved and has been proposed to be either a small SNR or a background galaxy. The X-ray spectroscopy provides a 2-10 keV flux of 2.9 x 10-12 erg cm-2 s-1, assuming an absorbed (NH ~7 x 1022 cm-2) power law with photon index 1.8. Given the X-ray characteristics we favour the AGN nature for the object, although we cannot exclude that it could be a composite SNR/pulsar wind nebulae.