Central Bureau for Astronomical Telegrams
IAUC 7874: XTE J1908+094; XTE J1751-305; 2002bz
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Circular No. 7874
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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Phone 617-495-7440/7244/7444 (for emergency use only)
XTE J1908+094
M. P. Rupen, V. Dhawan and A. J. Mioduszewski, National Radio
Astronomy Observatory, report: "We have detected a possible radio
counterpart to the black-hole candidate XTE J1908+094. Observations with
the Very Large Array on Mar. 21 and 22 show a radio source (flux 1.1 +/- 0.1
mJy at 4860 MHz, 0.84 +/- 0.08 mJy at 8460 MHz) at R.A. = 19h08m53s.077,
Decl. = +9d23'04".90 (J2000.0, uncertainty about 0".1 in each coordinate),
within the 17" error box reported from BeppoSAX (IAUC 7873) and about 8" from
its center. The radio spectrum is consistent with this identification,
although no variability has yet been seen, and there is no obvious
extension in the images (resolution 0".20). Further monitoring is underway."
XTE J1751-305
Z. Wang, D. Chakrabarty and J. L. Elliot, Massachusetts Institute
of Technology, report: "We have identified a possible infrared counterpart
for the new accreting millisecond pulsar XTE J1751-305 (IAUC 7867, 7870,
7872). We obtained infrared observations of the pulsar field with the
Magellan Consortium's 6.5-m Baade telescope at the Las Campanas Observatory
on Apr. 9. Only one star lies within the provisional 0".5 error circle
measured by the Chandra X-Ray Observatory on Apr. 10 (C. B. Markwardt,
private communication), down to a limiting magnitude of J = 22. The
magnitude of this star was J = 19.2 +/- 0.2. However, based on the
observed density of stars in this Galactic center field, there is a
significant chance coincidence probability of 20 percent. The preliminary
position for the infrared candidate is R.A. = 17h51m13s.51, Decl.
= -30d37'23".1 (equinox 2000.0, 0".2 uncertainty). Further observations are
required to verify this candidate by searching for 42-min orbital variability
and fading as the x-ray source declines."
SUPERNOVA 2002bz IN MCG +05-34-33
T. Matheson, S. Jha, P. Challis and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm) of
SN 2002bz (cf. IAUC 7866), obtained by P. Berlind on Apr. 5.36 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it
to be a type Ia supernova near maximum. Adopting the NASA/IPAC
Extragalactic Database recession velocity of 11~090 km/s for the host
galaxy, the supernova expansion velocity is about 10~900 km/s for Si
II (rest 635.5 nm) and 14~000 km/s for Ca II (rest 395.1 nm). The
spectral-feature supernova age o(Riess et al. 1997, A.J. 114, 722)
is 3 +/- 2 days before maximum light.
(C) Copyright 2002 CBAT
2002 April 12 (7874) Brian G. Marsden
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