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Possible optical counterpart of IGR J17254-3257

ATel #2032; I. Zolotukhin (SAI MSU)
on 26 Apr 2009; 13:08 UT
Credential Certification: M.Revnivtsev (mikej@hea.iki.rssi.ru)

Subjects: Optical, X-ray, Binary

We report on archive observations of IGR J17254-3257 field made with 3.6m ESO NTT telescope at the La Silla under programme ID 079.D-0385 on Jun 23, 2007. The I-band frames show a single point source located within 2" uncertainty of x-ray source position obtained with XMM-Newton earlier (Chenevez et al. 2007, A&A, 469, L27). Its estimated coordinates and magnitude are R.A.(J2000)=17:25:24.85, DEC(J2000)=-32:57:16.5 in the 2MASS reference frame (0.2" uncertainty), I_mag = 19.1 +/- 0.5 (large error is due to the lack of precise absolute photometry in the field).

We note however that there is another object 2.7" away from the centre of XMM-Newton position that cannot be completely ruled out as a counterpart of IGR J17254-3257, so we also list it here: R.A.(J2000)=17:25:24.97, DEC(J2000)=-32:57:14.0 (0.2" uncertainty), I_mag = 19.7 +/- 0.5.

Further observations of this field are required to tell between counterpart candidates. In particular CHANDRA observations of the source are planned.