Radio observations of XTE J1748-361 (= A1744-36?)
ATel #208; S. Corbel (Univ. Paris 7), R. P. Fender (Univ. Amsterdam), T. Tzioumis (ATNF), C. Brocksopp (MSSL)
on 20 Nov 2003; 14:28 UT
Distributed as an Instant Email Notice Transients
Credential Certification: S. CORBEL (corbel@discovery.saclay.cea.fr)
Subjects: Radio, X-ray, Binary, Black Hole, Neutron Star, Transient
Referred to by ATel #: 210
We report on radio observations of the recent X-ray transient XTE J1748-361
(ATEL #204), which is possibly coincident with A1744-36 (Atel #205, # 206).
Radio observations have been carried out with the Australia Telescope
Compact Array (ATCA) on 2003 November 12 (MJD 52955.77).
If XTE J1748-361 is associated with A1744-36, then its X-ray position is
known to better than 1" based on Chandra observations (Atel # 205). In that
case, we do not detect radio emission at the Chandra position of A1744-36
with an rms noise level of 0.15 mJy/beam at 4800 MHz and 8640 MHz.
On the contrary, if XTE J1748-361 is unrelated to A1744-36, then its
best position is given in Atel #204 with an error circle of 0.2 degree.
In that case, we found a new radio source slightly outside the ASM error
circle at the following position: alpha(J2000) = 17:48:49.14 and
delta(J2000) = -36:00:29.27 with a total positional uncertainty of 0.25",
and a flux density of 2.8 +/- 0.2 mJy at 4800 MHz. Further observations
would be needed to confirm a possible association with XTE J1748-361.
