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IAUC 6921: 1998ca, 1998ci, 1998cj; 1998bu

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                                                 Circular No. 6921
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/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVAE 1998ca, 1998ci, 1998cj
     N. Regnault and O. Perdereau, Laboratoire de l'Accelerateur
Lineaire, Universite de Paris-Sud, on behalf of the EROS
collaboration (cf. IAUC 6762, 6904), report the discovery of two
apparent supernovae in the course of the automated supernova search
with the 1-m Marly telescope (+ CCD) at La Silla.  SN 1998ci,
discovered at V about 18 on images taken on May 19, is located at
R.A. = 12h41m01s.12, Decl. = -6o39'48".2 (equinox 2000.0), which is
very close to the center of the anonymous host galaxy.  SN 1998ci
was not present on a frame taken on 1997 Apr. 4, but it was
confirmed on frames taken on 1998 May 20.
     SN 1998cj, discovered on images taken on May 21 at V about
17.2, is located at R.A. = 12h19m43s.30, Decl. = -12o13'41".8
(equinox 2000.0), which is 9".4 east and 10".8 south of the center
of NGC 4263.  This star was not present on a CCD frame taken on
1997 Feb. 7.  SN 1998cj was confirmed on CCD frames taken on 1998
May 26.
     G. Richards, University of Chicago; A. Kim, Physique
Corpusculaire et Cosmologie, College de France; P. Nugent, Lawrence
Berkeley Laboratory; H. Newberg and S. Kent, Fermi National
Accelerator Laboratory, and the EROS collaboration report that
spectra were obtained on May 27 UT with the 3.5-m ARC Telescope (+
Double Imaging Spectrograph) at Apache Point Observatory.  SN
1998cj is of type II, more than a month past maximum light.  SN
1998ci is a significantly reddened type-Ia supernova (like SN
1991T) at z = 0.025.  SN 1998ca (IAUC 6904) is a post-maximum
type-II event, within a month of maximum light, at z = 0.028.  The
redshifts (+/- 0.001) were estimated from absorption features in
the galaxy spectra.


SUPERNOVA 1998bu IN NGC 3368
     R. Evans and W. Wild, University of Chicago, report additional
magnitudes (cf. IAUC 6902) for SN 1998bu, obtained with the Yerkes
1-m telescope (estimated error +/- 0.15 mag):  May 21.10 UT, I =
12.0; 21.11, R = 11.8; 21.13, B = 12.4, V = 12.0.  Absolute
calibration was done using HR 1433, HR 4983, and HR 3427.
     CCD photometry by D. Hanzl, Brno, Czech Republic (0.40-m
reflector), based on comparison star GSC 849.733 (Tycho magnitudes
V = 9.73 +/- 0.03, B-V = +0.636 +/- 0.04):  May 10.835 UT, V =
12.83 +/- 0.04 (revision of value on IAUC 6899); 11.861, V = 12.59
+/- 0.02; 14.848, V = 12.25 +/- 0.02, B-V = +0.40 +/- 0.02; 20.857,
V = 12.01 +/- 0.04, B-V = +0.48 +/- 0.04.

                      (C) Copyright 1998 CBAT
1998 May 28                    (6921)            Daniel W. E. Green

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