Central Bureau for Astronomical Telegrams
IAUC 6731: USNO 1425.09823278; GRB 970828; 1997dd; 1997cx
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 6732
.dvi or
.ps format.
Circular No. 6731
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
USNO 1425.09823278
J.-y. Hu, Y.-l. Qiu, W.-d. Li, and J.-y. Wei, Beijing
Astronomical Observatory (BAO); and A. Esamdin, Urmqi Astronomical
Station, report their discovery of a new apparent cataclysmic
variable star: "The discovery was made during the BAO supernova
survey on Aug. 28, using the 0.60-m telescope at Xinglong Station.
The R magnitudes of this star were 13.3 and 13.5 on Aug. 28 and 31,
respectively. The USNO A1.0 catalogue lists the R and B magnitudes
of a star in this location as 19.9 and 20.3, respectively, with the
position given as R.A. = 19h27m11s.63, Decl. = +54o17'51".5
(equinox 2000.0). A spectrogram obtained with the 2.16-m telescope
at Xinglong Station on Aug. 31 shows typical features of
cataclysmic variables during outburst, with absorption Balmer lines
and weak He I lines (including a feature at 447.1 nm)."
GRB 970828
K. Yanagisawa and Y. Nakada, Kiso Observatory, University of
Tokyo; and M. Abe and Y. Ishibashi, Institute of Space and
Astronautical Science, report that a search was made with the Kiso
Schmidt telescope on Aug. 29.46-29.52 and 30.45-30.63 UT for an
optical counterpart to GRB 970828, around the position given by the
ASCA team on IAUC 6729. Three 15-min I-band CCD images (size 12'.5
x 12'.5) revealed no new objects brighter than the limiting
magnitude of the second Palomar Observatory Sky Survey. However,
two faint objects were seen very close to the x-ray position; the
closer object (I about 20.7) is at R.A. = 18h08m29s.48, Decl. =
+59o19'24".3 (equinox 2000.0), while a second object (I = 20.5) has
position end figures 29s.48, 35".1. The positional uncertainties
are 0s.03 in R.A. and 0".2 in Decl. No light variation > 0.5 mag
was detected during the two-day observations.
SUPERNOVA 1997dd IN NGC 6060
Reported unfiltered CCD magnitudes (GSC references stars):
Aug. 29.89 UT, 16.7 (S. Moretti and S. Tomaselli, Forli, Italy);
29.905, 17.1 (L. Boschini, Bergamo, Italy).
SUPERNOVA 1997cx IN NGC 3057
Unfiltered CCD magnitude estimate by Moretti and Tomaselli:
Aug. 29.9 UT, 16.7.
(C) Copyright 1997 CBAT
1997 September 3 (6731) Daniel W. E. Green
Read IAUC 6732
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
