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IAUC 8302: 2004ar, 2004as,, 2004at

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                                                  Circular No. 8302
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 2004ar, 2004as, AND 2004at
     A. Connolly, University of Pittsburgh, on behalf of the Sloan
Digital Sky Survey (SDSS) collaboration, reports the discovery of a
type-Ia supernova, approximately 9 days after maximum light, on a
45-min spectrogram (range 380-980 nm) taken with the 2.5-m
telescope (+ multi-fiber spectrograph) at Apache Point Observatory
in the course of the SDSS main galaxy redshift survey around Feb.
20.27 UT.  The following SDSS position of SN 2004ar is the centroid
of the galaxy targeted by the spectroscopic observation (no imaging
was obtained, unfortunately, though an SDSS image taken on 2003
Dec. 25 may show the supernova faintly), the supernova estimated as
being likely within 1".5 of the targeted position:  R.A. =
9h59m48s.1, Decl. = +11o28'25" (equinox 2000.0).  The redshift of
the host galaxy is z = 0.0604.  The estimated apparent magnitudes
of SN 2004ar are g = 18.6, r = 18.34, and i = 18.6 (based on the
spectrophotometry and measured within the 3"-diameter aperture
centered on the galaxy).  Following a request from the Central
Bureau, P. Holvorcem and M. Schwartz took a 240-s unfiltered (red)
CCD exposure with the Tenagra 0.81-m telescope on Mar. 11.25, which
shows a point-source object of mag 17.9 (that is not visible on the
red Digitized Sky Survey image) located at R.A. = 9h59m48s.17,
Decl. = +11o28'26".5, which is 0".9 west and 2".6 north of a nearby
galaxy.
     Further to IAUC 8300, H. Pugh, J. Burket, 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
2004as   Mar. 11.31  11 25 39.18  +22 49 49.4  17.3   4".7 E, 2".9 S
2004at   Mar. 12.30  10 58 45.18  +59 29 12.0  17.7   12".6 W, 0".1 S

Additional KAIT magnitudes:  SN 2004as, Feb. 23.41 UT, [18.0; Mar.
10.31, 17.5; 12.38, 17.2.  SN 2004at in MCG +10-16-37, Feb. 29.35,
[18.5, Mar. 13.29, 17.2.
     T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of SN 2004as, obtained by P. Berlind on Mar. 13.30 UT with the Mt.
Hopkins 1.5-m telescope (+ FAST), shows it to be a type-Ia
supernova a few days before maximum light.  A narrow H_alpha
emission line superposed on the spectrum of the supernova indicates
a recession velocity of 9300 km/s for the host galaxy.  Using this
value, the supernova expansion velocity is about 14100 km/s for Si
II (rest 635.5 nm).

                      (C) Copyright 2004 CBAT
2004 March 13                  (8302)            Daniel W. E. Green

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