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IAUC 7169: 1999cd; 1999cc; 1999cb; 1999by

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                                                  Circular No. 7169
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1999cd IN NGC 3646
     M. Papenkova and W. D. Li, University of California at
Berkeley, on behalf of the Lick Observatory Supernova Search (cf.
IAUC 6627, 7126), report their discovery with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) of an apparent supernova in NGC
3646.  The new object was discovered on unfiltered images taken on
May 14.224 and 14.279 UT (mag about 17.9) and was confirmed on
images taken on May 15.175 (mag about 17.6).  SN 1999cd is located
at R.A. = 11h21m42s.89, Decl. = +20o09'24".1 (equinox 2000.0),
which is about 3".7 west and 46".4 south of the galaxy nucleus.  A
KAIT image of the same field taken on May 9.2 shows nothing at the
position of SN 1999cd (limiting mag 19.0).  SN 1989N, a type-II
supernova, also occurred in NGC 3646 (peak mag about 14).


SUPERNOVA 1999cc IN NGC 6038
     P. Garnavich, S. Jha, R. Kirshner, and P. Challis, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999cc (cf. IAUC 7163) was obtained by P. Berlind with the 1.5-m
Tillinghast telescope on May 14.3 UT that shows this to be a
type-Ia supernova before maximum brightness.  A strong Si II
absorption is observed at 628.9 nm, which implies a photospheric
velocity of 12~300 km/s after correcting for the redshift of NGC
6038 (9500 km/s, derived from narrow emission in the spectrum).


SUPERNOVA 1999cb IN MARKARIAN 881
     Garnavich et al. also write:  "A spectrum of SN 1999cb (cf.
IAUC 7163) was obtained by P. Berlind with the 1.5-m Tillinghast
telescope on May 14.4 UT.  The spectrum shows a deep, broad Na I
586-nm absorption and iron features in the blue, which suggest that
this a type-Ia supernova about a month past maximum brightness."


SUPERNOVA 1999by IN NGC 2841
     CCD magnitudes by D. Hanzl, Brno, Czech Republic (cf. IAUC
7157, 7158):  May 2.872 UT, V-R = +0.12 +/- 0.03; 5.821, V = 13.71
+/- 0.01, B-V = +0.32 +/- 0.01, V-I = +0.28 +/- 0.03, V-R = +0.19
+/- 0.01; 7.049, V = 13.52 +/- 0.02, B-V = +0.31 +/- 0.1, V-I =
+0.25 +/- 0.02; 14.046, V = 13.16 +/- 0.09, V-R = +0.3 +/- 0.1.

                      (C) Copyright 1999 CBAT
1999 May 15                    (7169)            Daniel W. E. Green

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