Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7531: 2000ey; 2000el; KS 1947+300 = GRO J1948+32

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 7530 SEARCH Read IAUC 7532

View IAUC 7531 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 7531
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2000ey IN IC 1481
     R. Chornock, W. D. Li and A. V. Filippenko, University of California,
Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the discovery with
the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of an apparent
supernova on unfiltered images taken on Nov. 11.2 (mag about 16.2),
20.2 (mag about 15.4) and 28.2 UT (mag about 15.6).  The new object is
located at R.A. = 23h19m25s.20, Decl. = +5o54'21".1 (equinox 2000.0), which
is 0".6 east and 1".2 south of the nucleus of IC 1481.  A KAIT image of the
same field on Nov. 6.3 showed nothing at the position of the supernova
(limiting mag about 18).
     Filippenko and Chornock report that CCD spectra (range 330-1000 nm)
obtained on Nov. 29 with the Shane 3-m reflector at Lick Observatory show
that the object is a normal type Ia supernova, 1 +/- 2 days past maximum
brightness (using the spectral-feature aging method of Riess et al. 1997,
A.J. 114, 722).


SUPERNOVA 2000el IN NGC 7290
     Chornock, Li and Filippenko also report the independent discovery by
LOTOSS of SN 2000el (IAUC 7523).  Available photometry (all unfiltered),
obtained after subtracting a template image obtained on 1999 Nov. 25:
2000 Oct. 18.2 UT, [19.0; 23.1, 17.2; 31.1, 16.7; Nov. 8.2, 17.0; 11.2, 17.0;
27.1, 16.8.  Filippenko and Chornock report that Nov. 29 spectra obtained as
above show that the object is a normal type II supernova.  H-alpha has a
classic P-Cyg profile, and there are several prominent Fe II absorption lines.


KS 1947+300 = GRO J1948+32
     J. Swank, Goddard Space Flight Center; and E. Morgan, Massachusetts
Institute of Technology, report that the transient x-ray source KS 1947+300
(IAUC 7523) is a pulsar with a barycentric period on Nov. 21 of 18.7579(5) s.
This period is consistent with the object's being identical with the pulsar
GRO J1948+32 (Chakrabarty et al. 1995, Ap.J. 446, 826), having slowed down
from the 18.70 s of an outburst in 1994 at an average rate of 8 ms/yr.  The
flux was 4.5 x 10**-10 erg cm-2 s-1 above 2 keV, with a cutoff power-law
spectrum (photon index about 0.6, with a 10-keV e-folding energy above 6 keV)
and a small column density (< 10**21 cm-2).  A sequence of RXTE observations
was undertaken, with the source last seen on Nov. 28 at a flux diminished
by a factor of four.

                      (C) Copyright 2000 CBAT
2000 November 29               (7531)              Brian G. Marsden

Read IAUC 7530 SEARCH Read IAUC 7532

View IAUC 7531 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!