Central Bureau for Astronomical Telegrams

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IAUC 8296: 2004ac, 2004ad; 2004ae, 2004af, 2004ag, 2004ah, 2004ai, 2004aj

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                                                  Circular No. 8296
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)


SUPERNOVAE 2004ac AND 2004ad
     M. Armstrong, Rolvenden, U.K., reports the discovery of an
apparent supernova (mag 17.0) on unfiltered CCD images taken on
Mar. 1.796 and 2.789 UT.  The new object is located at R.A. =
2h02m26s.39, Decl. = +32o04'22".2 (equinox 2000.0), which is
approximately 4" east and 1".6 north of the center of NGC 789.
Nothing was visible at this position on Armstrong's images taken on
2003 Sept. 24 (limiting mag 19.5), 2004 Jan. 9 (limiting mag 18.5),
and Feb. 9 (limiting mag 19.0) or on Palomar Sky survey red and
blue plates.
     Corrigendum.  On IAUC 8295, 'Supernova 2004ac in IC 4769',
line 5, *for*  9"  west  *read*  2" west


SUPERNOVAE 2004ae, 2004af, 2004ag, 2004ah, 2004ai, 2004aj
     M. Riello, S. Benetti, E. Cappellaro, F. Patat, M. T.
Botticella, G. Altavilla, A. Pastorello, M. Turatto, and S. Valenti
report the discovery of six supernovae on CCD frames taken on Feb.
18 during a search performed with the Max-Planck-Institut 2.2-m
telescope (+ Wide Field Imager) at the European Southern
Observatory (ESO).

SN         R.A. (2000.0) Decl.      V     Offset            z    Type
2004ae   4 28 17.89  -36 18 55.0   23.3   < 0".3          0.480   II
2004af   5 38 03.91  -23 59 00.2   22.5   3".2 W, 4".3 S  0.056   Ic
2004ag   9 51 01.49  -20 50 37.5   23.0   < 0".5          0.362   II
2004ah  10 45 47.41  - 0 06 58.1   23.3   < 0".8          0.480   Ia
2004ai  13 54 26.09  -12 41 15.9   23.4   1".0 S          0.590   Ic
2004aj  14 20 37.58  -12 24 14.4   22.3                   0.247   Ia

Nothing was visible at the above positions on reference images
taken during 2001-2002.  Spectroscopy (range 600-1100 nm), obtained
on Feb. 26 and 27 with the ESO 8.2-m YEPUN telescope (+ FORS2),
reveals that each supernova was caught around maximum, with the
exception of 2004af, which shows very strong nebular emission lines
of Mg I], Na I, [O I], [Ca II], and Ca II, and 2004af bears a
strong resemblance with that of SN 1998bw at about 6 months past
maximum light (Patat et al. 2001, Ap.J. 555, 900).  The enhanced
emission that is observed in the range 400-550 nm may also be
attributed to a blend of Fe lines.  The absolute magnitude of
2004af, M(R) = -14.3 (H_o = 72 km/s/Mpc), is unusually bright for a
type-Ib/c event at these phases and implies a maximum brightness
M(R) < -19.  This, coupled with the spectral appearance, make
2004af a hypernova candidate.

                      (C) Copyright 2004 CBAT
2004 March 4                   (8296)            Daniel W. E. Green

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