Confirmation of Radio Counterpart to XTE J1817-330

ATel #721; M. P. Rupen V. Dhawan, A. J. Mioduszewski (NRAO)
on 3 Feb 2006; 21:21 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

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Very Large Array (VLA) observations of the black hole candidate binary XTE J1817-330 (ATel #714) show that the suggested radio counterpart (ATel #717) has faded significantly (3.9sigma) at 4.86 GHz, from 0.83 +/- 0.12 mJy on Jan. 31 to 0.32 +/- 0.06 mJy on Feb. 2, and 0.35 +/- 0.05 mJy on Feb. 3. This variability strongly suggests that this is indeed the counterpart to the X-ray transient.

The Feb. 3 observations, using newly-determined antenna positions, also yield an improved (J2000) position for the source:
18h 17m 43.526s -33d 01' 07.47"
with a likely accuracy of +/- 0.2 arcseconds.

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