Radio detection and localization of XTE J1652-453 with the ATCA
ATel #2135; D. E. Calvelo (University of Southampton), T. Tzioumis (ATNF), S. Corbel (CEA Saclay & UniversitÃ© Paris Diderot), C. Brocksopp (UCL-MSSL), R. P. Fender (University of Southampton)
on 22 Jul 2009; 23:10 UT
Credential Certification: Catherine Brocksopp (email@example.com)
Subjects: Radio, Request for Observations, Binary, Black Hole, Transient
Following the discovery of the new X-Ray transient XTE J1652-453 by
RXTE (ATel #2107), we have conducted radio
observations with the Australia Telescope Compact Array and the new
CABB back-end in the H75 configuration on 06-07-2009, 07-07-2009 & 13-07-2009.
A variable radio source is detected at a position consistent with the
refined Swift error circle (ATel #2120)
with preliminary flux density of 0.75 +/- 0.07 mJy at 9 GHz and 0.95 +/-
0.06 mJy at 5.5 GHz on 13-07-09, giving a spectral index of -0.47 +/- 0.23.
The source went undetected in images from the 06-07 & 07-07 suggesting flux density <0.06 mJy
at 5.5 GHz & <0.08 & <0.15 mJy at 9 GHz respectively.
The ATCA radio observations seem to indicate the decay of an optically
thin synchrotron event associated with the activation
of XTE J1652-453.
Analysis of the ATCA images yields a position of : RA = 16h52m20.33s DEC =
-45d20'39.99" with an uncertainty of 0.32' taking into account
the result of the fit as well as the phase calibrator uncertainties
This ATCA position would favor Star B from ATel #2125 as the
most likely near infrared counterpart of XTE J1652-453.