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IAUC 8124: 2003dv; 2003dw; V4745 Sgr = N Sgr 2003

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                                                  Circular No. 8124
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2003dv IN UGC 9638
     R. Kotak and W. P. S. Meikle, Imperial College, London, on
behalf of the European Supernova Collaboration, report that spectra
(resolution 0.27 nm) of the possible supernova reported on IAUC
8121, obtained at the Isaac Newton Telescope (+ IDS spectrograph)
by P. Rodriguez-Gil on Apr. 26.11 (range about 500-750 nm) and Apr.
27.06 UT (range about 350-570 nm), indicate that it is of type IIn,
about 1 week past explosion.  The spectrum comprises a blue
continuum upon which a number of emission features are superposed.
The continuum appears to show a break at about 530 nm, blueward of
which it becomes steeper.  The spectrum lacks broad P-Cyg-type
profiles and bears a striking resemblance to early-epoch spectra of
the type-IIn SN 1998S (IAUC 6829; Leonard et al. 1999, Ap.J. 536,
239; Fassia et al. 2001, MNRAS 325, 907).  Balmer lines in emission
are present and exhibit a multicomponent structure.  The H_alpha
profile comprises a narrow but resolved component (FWHM about 350
km/s) superposed on a much broader profile of FWZI about 10000 km/s.
The narrow component appears to lie slightly redward (about 350
km/s) of the peak of the broad component.  A broad emission feature
at about 470 nm is present, which is attributed to a blend of He II
468.6-nm and C III 464.8-nm/N III 464.0-nm (cf. SN 1998S; IAUC
6832).  A weak He I 587.6-nm emission feature may also be present.
In SN 1998S, the early-time emission features yielded valuable
information about the interaction of the supernova with the
'circumstellar medium' of the progenitor star, but these features
persisted for barely 10 days.  High-resolution spectral coverage
over the next few days is urged.

SUPERNOVA 2003dw IN MCG +10-24-51
     D. Rich, Hampden, ME, reports his discovery of an apparent
supernova (mag about 16.7) on unfiltered CCD frames taken with a
0.31-m reflector on Apr. 26.17 and 28.10 UT.  SN 2003dw is located
at R.A. = 16h45m51s.10, Decl. = +59o37'38".0 (equinox 2000.0),
which is about 11".4 west and 19".0 north of the center of MCG
+10-24-51.  The new object is not visible on the red/blue Palomar
Sky Survey digital images or on CCD frames taken by Rich on 2002
Apr. 5.32 and May 22.24 (limiting mag 18.0).

     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V4745 Sgr has been given to this object (cf. IAUC
     Corrigendum.  On IAUC 8123, line 2, FOR  Nicolas  READ  Nicholas

                      (C) Copyright 2003 CBAT
2003 April 28                  (8124)            Daniel W. E. Green

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