Central Bureau for Astronomical Telegrams
IAUC 5786: GRS 1915+105; PSR 0540-693; alpha PsA
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 5787
.dvi or
.ps format.
Circular No. 5786
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
GRS 1915+105
J. Greiner, Max-Planck-Institut fur Extraterrestrische Physik,
Garching, communicates: "Using a ROSAT HRI observation of the 1992
transient GRS 1915+105 in Aquila, its x-ray position has been
determined to about +/- 10" accuracy: R.A. = 19h15m11s.8, Decl. =
+10 56'47" (equinox 2000.0). A check of the second Palomar Sky
Survey plates (courtesy of N. Reid, Palomar Observatory) has
revealed three highly reddened stars fainter than magnitude R = 21
within the 10" x-ray error box. Two of these objects are variable
between 1992 June 10 and Aug. 8: one has brightened (as the x-ray
source; cf. IAUC 5619), while the other has become fainter. The
radio position (IAUC 5773) is about 5" from the central position
given above and coincides in position with the third, non-variable
optical object. Optical spectroscopy is in progress."
PSR 0540-693
A. Shearer, M. Redfern, T. Rowold, P. O'Kane, R. Butler, and
C. O'Byrne, University College, Galway; and H. Pedersen, Copenhagen
University Observatory, communicate: "We have observed the position
of the optical pulsar 0540-693 (Middleditch and Pennypacker
1985, Nature, 313, 659) using the European Southern Observatory's
New Technology Telescope (+ UCG/DIAS/ESO MAMA image sharpening
camera, TRIFFID) on 1993 Jan. 15-16. On each night, the 19.838-Hz
barycentric power spectrum component (computed from the pulsar
period given in Manchester et al. (1993, Ap.J. 403, L103) showed a
single spatial peak, consistent in height with Middleditch and
Pennypacker, in the center of the nebulosity and coincident with
the northern maximum of Caraveo et al. (1992, Ap.J. 395, L103)."
alpha PISCIS AUSTRINI
V. Mannings and J. P. Emerson, Department of Physics, Queen
Mary and Westfield College, London, report: "We find a 3-sigma upper
limit of 24 mJy at 1.3 mm for alpha PsA (Fomalhaut), the observation
acquired in excellent conditions on Apr. 28.72-28.75 UT using
the James Clerk Maxwell Telescope (+ UKT14) at Mauna Kea. A
19".8 beam and 90" chop in azimuth were used. This upper limit is
a factor of 2 below the 1.3-mm detection reported on IAUC 5732."
1993 May 10 (5786) Daniel W. E. Green
Read IAUC 5787
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
