Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6627: 1997bs; GRS 1737-31; 1997br

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 6626 SEARCH Read IAUC 6628

View IAUC 6627 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6627
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)


SUPERNOVA 1997bs IN NGC 3627
     R. R. Treffers, C. Y. Peng, and A. V. Filippenko, University
of California at Berkeley; and M. W. Richmond, Princeton University,
report the discovery on Apr. 15 UT of a supernova (R = 17.0 +/- 0.2)
located about 13" west and 67" south of the nucleus of NGC 3627
(R.A. = 11h20m15s.1, Decl. = +12o59'22", equinox 2000.0).  This is
the first supernova found as part of the Lick Observatory Supernova
Search (the direct successor of the former search at Leuschner
Observatory), which is conducted with the fully automated 0.8-m
Katzman Automatic Imaging Telescope.  An Apr. 10 frame (limiting
mag 17.6) shows no image at the location of SN 1997bs.  A CCD
spectrogram (range 320-800 nm, resolution 0.7 nm), obtained with
the Lick 3-m Shane reflector on Apr. 16 by Filippenko, A. J. Barth,
and A. M. Gilbert (also of Berkeley), shows that the object is a
peculiar type-II supernova (formally known as type IIn), dominated
by relatively narrow (FWHM = 1000 km/s) Balmer emission lines on a
featureless continuum.  There are also many weaker Fe II emission
lines.  SNe 1973R and SN 1989B also occurred in NGC 3627.


GRS 1737-31
     Y. Ueda, T. Dotani, S. Uno, H. Inoue, and F. Nagase, Institute
of Space and Astronautical Science; Y. Maeda and M. Sakano,
University of Kyoto; P. Durouchoux, Centre d'Etudes de Saclay; and
J. H. Swank, Goddard Space Flight Center, NASA, report on behalf
of the ASCA team: "The hard-x-ray transient GRS 1737-31 (IAUC 6599)
was observed with ASCA during Apr. 2.37-2.94 UT (net exposure
27 000 s).  The source was detected with an averageintensity of 6
mCrab (2-10 keV) at R.A. = 17h40m09s, Decl. = -31o02'.4 (equinox
2000.0; error radius 0'.5), which is consistent with the BeppoSAX
position determination (IAUC 6606).  The energy spectrum is well
represented by a power law with photon index 1.6 +/- 0.1, with a
hydrogen column density of (6 +/- 1) x 10E22 cmE-2.  The large
absorption is consistent with the location close to the galactic
center.  Assuming the source distance to be 8500 pc, the 2-10-keV
x-ray luminosity was 1.6 x 10E36 erg/s after correcting for
absorption."


SUPERNOVA 1997br IN ESO 576-40
     Corrigendum.  On IAUC 6623, line 14, for  Ca II, Mg II, Si II,
and S II  read  Si II and Fe

                      (C) Copyright 1997 CBAT
1997 April 16                  (6627)            Daniel W. E. Green

Read IAUC 6626 SEARCH Read IAUC 6628

View IAUC 6627 in .dvi or .ps format.

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

Valid HTML 4.01!