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Swift/XRT localization of IGR J19149+1036

ATel #3326; E. Bozzo, C. Ferrigno, L. Pavan, R. Walter (ISDC, Switzerland), L. Stella (INAF-OAR, Italy)
on 5 May 2011; 10:12 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Gamma Ray, AGN, Binary, Black Hole, Neutron Star, Transient

The field around the recently discovered IGR J19149+1036 (Pavan et al., 2011, A&A, 526, 122) was observed by Swift/XRT twice, on 2010 Dec. 5 and 2011 Feb. 17. The total exposure time was 2.1 ks. In both observations, a single point-like source was detected within the IBIS/ISGRI error circle. By summing up all the available XRT data we estimated the best position at: RA = 19h14m56.73s Dec = +10:36:38.11 (J2000), with an associated uncertainty of 3.7 arcsec. This position is still consistent with IGR J19149+1036 being associated to the Einstein source 2E 1912.5+1031.

The XRT spectrum could be reasonably well fit by using an absorbed power-law model with N_H=(6.5+/-3.0)E+22 cm^(-2), and Gamma=1.8+/-0.8. The 1-10 keV X-ray flux is 1.8E-11 erg/cm^(2)/s (uncorrected for absorption). This would correspond to a flux in the 17-80 keV energy band compatible (to within the uncertainties) with that measured by INTEGRAL.

Within the XRT error circle, we identify J19145680+1036387 (J=14.34+/-0.03, H=12.41+/-0.03, K=11.53+/-0.02) as the most likely 2MASS counterpart to IGR J19149+1036.

By using the on.-line tool Heavens we noticed that IGR J19149+1036 is also detected by the JEM-X telescope on-board INTEGRAL at a significance level of 6.2 sigma. The estimated 3-10 keV X-ray flux is 7E-12 erg/cm^(2)/s.