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IAUC 8454: 2004gt, 2004gu, 2004gv; 2004gj, 2004go

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IAUC number 

                                                  Circular No. 8454
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 2004gt, 2004gu, 2004gv
     The discoveries of three appparent supernovae have been
reported:  2004gt by L. A. G. Monard (cf. IAUC 8430), 2004gu by R.
Quimby, C. Gerardy, P. Hoeflich, and J. C. Wheeler (cf. IAUC 8446;
note that Gerardy is at Imperial College), and 2004gv by Y.-t. Chen
(cf. IAUC 8420).

SN       2004 UT         R.A.  (2000.0)  Decl.    Mag.     Offset
2004gt   Dec. 12.076  12 01 50.37  -18 52 12.7   14.9   34" W, 10" S
2004gu   Dec. 13.50   12 46 24.72  +11 56 56.1   17.5   1".1 W, 2".1 S
2004gv   Dec. 13.669   2 13 37.42  - 0 43 05.8   17.6   13".8 W, 4".0 S

Additional unfiltered CCD magnitudes by the respective discoverers:
SN 2004gt in NGC 4038, May 11.250 UT, [15.7 (dense region); Dec.
16.015, 14.6.  SN 2004gu in FGC 175A (cf. Karachentsev et al. 1993,
A.N. 314, 97), June 15.17, [17.7; Dec. 15.49, 17.5.  SN 2004gv in
NGC 856, Nov. 28.742, [18.6; Dec. 14.569, 17.4.  Monard's offset
for 2004gt above is with respect to the more northern of the double
nucleus of NGC 4038; he adds that the new object is located on top
of a condensed region in the prominent western spiral arm, and
eight past images (June 2002-May 2004) show no change in brightness
of this region.  Gerardy et al. add that a spectrogram (range 400-
820 nm), obtained on Dec. 16.41 with the 2.7-m Harlan J. Smith
telescope (+ Imaging Grism Instrument) by A. Bauer, suggests that
SN 2004gu is of type Ia; the spectrum roughly resembles that of SN
1999ee slightly before maximum (Hamuy et al. 2002, A.J. 124, 417).


SUPERNOVAE 2004gj AND 2004go
     Further to IAUC 8453, A. V. Filippenko and R. J. Foley add
that their Dec. 12 spectra show that SN 2004gj (IAUC 8445) is
probably of type IIb, perhaps 2 months after the explosion;
besides the He I lines, a relatively prominent absorption line at
630 nm is reasonably identified as H_alpha.
     H. Navasardyan,  M. Turatto, A. Harutunyan, S. Benetti, and N.
Elias-Rosa, Osservatorio Astronomico di Padova; and A. Pastorello,
Max-Planck-Institut, report that a spectrogram of SN 2004go (cf.
IAUC 8448, 8450), obtained by R. Viotti and C. Rossi on Dec. 7.94
UT with the Asiago 1.8-m telescope (+ AFOSC; range 355-780 nm,
resolution 2.4 nm), shows it to be a type-Ia supernova, 3-4 weeks
past maximum.  The spectrum closely resembles that of SN 2002bo
(Benetti et al. 2004, MNRAS 348, 261) at comparable phase.

                      (C) Copyright 2004 CBAT
2004 December 16               (8454)            Daniel W. E. Green

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