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IAUC 8129: 2003ed; 2003dt, 2003dw; 2003ds

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IAUC number 

                                                  Circular No. 8129
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)
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SUPERNOVA 2003ed IN NGC 5303A
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi
Itagaki (Teppo-cho, Yamagata-ken) of an apparent supernova (mag
15.2) on unfiltered CCD frames taken around May 3.496 and 4.479 UT.
An image taken by Itagaki with a 0.60-m reflector on May 3.526
yields the following precise position for SN 2003ed:  R.A. =
13h47m45s.36, Decl. = +38o18'20".3 (equinox 2000.0), which is 8"
northeast of the nucleus of NGC 5303.  Nothing appeared at this
location on images taken by Itagaki on Apr. 9 and 27 (limiting mag
19).  An unfiltered CCD image taken by R. Kushida, Yatsugatake
South Base Observatory, on May 3.604 (measured by Y. Kushida)
yields position end figures 45s.38, 20".2 (mag 15.3), which is 3".3
east and 4".1 north of the center of NGC 5303A (with NGC 5303B
situated southwest of NGC 5303A).  K. Kadota, Ageo, Japan, reports
position end figures 45s.39, 20".8 (and mag 15.2) for SN 2003ed
from an unfiltered CCD image taken on May 3.617.
     T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of SN 2003ed (cf. IAUC 8129), obtained by J. Huchra on May 5.32 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-II supernova soon after
explosion.  The spectrum consists of a blue continuum with
incipient P-Cyg lines of hydrogen and helium.


SUPERNOVAE 2003dt AND 2003dw
     Matheson et al. add that a spectrum of SN 2003dt (cf. IAUC
8120), obtained as above on May 5.45 UT, shows it to be a type-Ia
supernova several weeks past maximum.  A spectrum of SN 2003dw (cf.
IAUC 8124), obtained on May 5.34, shows it to be a type-Ia
supernova near maximum.  Adopting the NASA/IPAC Extragalactic
Database recession velocity of 9003 km/s for the host galaxy, the
supernova expansion velocity is 12500 km/s for Si II (rest 635.5
nm).  The spectral-feature age of the supernova (Riess et al. 1997,
A.J. 114, 722) is 1 +/- 2 days after maximum light.


SUPERNOVA 2003ds IN MCG +08-19-17
     Corrigendum.  On IAUC 8120, line 8, FOR  SN 2003ds in NGC 3191
READ  SN 2003ds in MCG +08-19-17

                      (C) Copyright 2003 CBAT
2003 May 5                     (8129)            Daniel W. E. Green

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