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IGR/XTE J17464-3213: New radio position and optical counterpart

ATel #146; D. Steeghs, J. M.Miller (CfA), D. Kaplan (Caltech), M. Rupen (NRAO)
on 10 Apr 2003; 18:19 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Danny Steeghs (dsteeghs@cfa.harvard.edu)

Subjects: Radio, Infra-Red, Optical, X-ray, Gamma Ray, Request for Observations, Black Hole, Transient

Referred to by ATel #: 314

Taking into account all VLA observations of this source up to April 8, we have obtained a revised radio position for IGR/XTE J17464-3213;

17 46 15.608 +/- 0.17" -32 14 00.6 +/- 0.5" (J2000)

This is 0.7" south of the position reported in IAUC 8105 bringing the VLA position closer to a nearby optical counterpart present in Magellan I and R-band images (ATEL #141). This possible counterpart is consistent with the K-band source reported by Baba et al. 2003 (IAUC 8112 ). Our images with a spatial sampling of 0.069"/pixel resolve the K-band emission into three distinct point sources. The north-east component position is 17:46:15.57 -32:14:00.88 (J2000) in the USNO frame and was found at I=19.3, R=21.9 in our April 5 images.

The reported K magnitude is in line with the Schlegel et al. (1988) extinction estimate (E(B-V)=3.48, N_H=1.7E22) and suggests a de-reddened I band magnitude of 12.6 for this candidate. Extrapolation of nearly contemporaneous radio flux levels amount to I~11.3. The brightness of this counterpart candidate is thus within an order of magnitude of jet model predictions as applied to e.g. GX339-4 (Markoff et al. 2003). The source is unresolved under 0.5" seeing conditions.

Given the continued radio activity, further optical/IR observations to establish variability are encouraged.

New image:

http://hea-www.harvard.edu/~dsteeghs/IGR1746_Magellan_I_new.gif

Updated Magellan I band image