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IAUC 8299: 2004an, 2004ao; 2004am; C/2001 Q4

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                                                  Circular No. 8299
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2004an AND 2004ao
     Further to IAUC 8297, D. Singer and W. Li report the LOSS
discovery of two apparent supernovae on unfiltered KAIT images:

SN       2004 UT       R.A.  (2000.0)  Decl.   Mag.     Offset
2004an   Mar. 7.50   14 40 19.57  +16 41 03.8  18.1  1".1 E, 2".7 S
2004ao   Mar. 7.54   17 28 09.35  + 7 24 55.5  14.9  6".3 E, 23".8 S

Additional KAIT magnitudes:  SN 2004an in IC 4483, Feb. 2.49 UT,
[19.0; Mar. 6.54, 18.1.  SN 2004ao in UGC 10862, 2003 Sept. 13.21,
[19.0; 2004 Mar. 8.54, 15.0.

     S. Mattila, Stockholm Observatory; W. P. S. Meikle, Imperial
College, London; P. Groeningsson, Stockholm Observatory; R. Greimel
and M. Schirmer, Isaac Newton Group of Telescopes; and J. A.
Acosta-Pulido, Instituto de Astrofisica de Canarias, obtained
infrared images and spectra of SN 2004am (IAUC 8297) on Mar. 6.9
UT, using LIRIS on the William Herschel Telescope (WHT).
Preliminary reduction of the 0.89-1.53-micron spectrum shows
discrete features superimposed on a significant continuum sloping
slightly upwards to longer wavelengths.  Emission lines of
Paschen_gamma and Paschen_beta are seen, having FWZI of about 2800
km/s.  It is concluded that this is a type-II supernova, but
probably highly reddened within the starburst galaxy M82.  The
spectrum has some similarity to that of the type-IIP supernova
1995V (Fassia et al. 1998, MNRAS 299, 150) at about 85 days.  A
preliminary magnitude of K_s = 12 was estimated for the supernova
via image-subtraction techniques, using a reference K_s-band image
obtained on 2002 Jan. 3.0 with the WHT (+ INGRID) as part of the
ongoing 'Nuclear Supernova Search' campaign.  Adopting the
unfiltered magnitude (m_u) from IAUC 8297 yields a color of m_u-K
about +5.  This indicates a high extinction for the supernova, as
already suggested by W. Li (private comm.), corresponding to a
visual extinction of about 5 magnitudes.

COMET C/2001 Q4 (NEAT)
     Visual total-magnitude estimates:  Feb. 19.04 UT, 7.2 (J.
Shanklin, Stanley, Falkland Islands, 10x50 binoculars); Mar. 1.77,
7.2 (D. A. J. Seargent, Cowra, N.S.W., 6x35 binoc.); 5.12, 7.2
(Shanklin, Rothera, Antarctica); 8.52, 7.5 (A. Pearce, Nedlands, W.
Australia, 20x80 binoculars).

                      (C) Copyright 2004 CBAT
2004 March 8                   (8299)            Daniel W. E. Green

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