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IAUC 7597: 2001ae; 2001ab; 2001ac; 2001ad

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IAUC number 

                                                  Circular No. 7597
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 2001ae IN IC 4229
     A. Friedman and W. D. Li, University of California at
Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the
discovery of an apparent supernova (mag about 17.3) on
unfiltered images taken on Mar. 15.5 and 16.3 UT with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT).  SN 2001ae is
located at R.A. = 13h22m26s.16, Decl. = -2 25'25".0 (equinox
2000.0), which is 1".0 east and 18".3 south of the nucleus of
IC 4229.  The new object was also confirmed on an unfiltered CCD
image taken by M. Schwartz on Mar. 16.4 with the Tenagra
Observatory 0.5-m automatic telescope.  A KAIT image taken on
Feb. 27.5 showed nothing at this position (limiting mag about
19.0).


SUPERNOVA 2001ab IN NGC 6130
     T. Matheson, S. Jha, P. Challis, and R. Kirshner,
Harvard-Smithsonian Center for Astrophysics, report that a
spectrum of SN 2001ab (cf. IAUC 7595), obtained by M.
Calkins on Mar. 14.52 UT with the F. L. Whipple Observatory
1.5-m telescope (+ FAST spectrograph), shows it to be a type-II
supernova.  The spectrum consists of a blue continuum with
superposed P-Cyg lines of hydrogen.


SUPERNOVA 2001ac IN NGC 3504
     Matheson et al. add:  "A spectrum of SN 2001ac (cf. IAUC
7596), obtained as above by Calkins on Mar. 14.45 UT, shows an
object with a blue continuum and narrow hydrogen emission lines
(FWHM about 900 km/s).  The broader component of the Balmer
lines often seen in type-IIn supernovae is not apparent.  It is
similar to the spectrum of the type-IIn SN 1997bs (Van Dyk et al.
2000, PASP 112, 1532) and SN 1999bw (IAUC 7150); this may be a
superoutburst of a luminous blue variable rather than a true
supernova."


SUPERNOVA 2001ad IN NGC 6373
     Matheson et al. also write:  "A spectrum of SN 2001ad (cf.
IAUC 7596), obtained as above by P. Berlind on Mar. 15.49 UT,
shows it to be a type-II supernova.  The spectrum consists of a
continuum with superposed P-Cyg lines of hydrogen.  Adopting the
NASA/IPAC Extragalactic Database recession velocity of 3320 km/s
for the host galaxy, the expansion velocity derived from the
minimum of the H-beta line is about 12 000 km/s."

                      (C) Copyright 2001 CBAT
2001 March 17                  (7597)            Daniel W. E. Green

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