SUPERNOVA 2004gv IN NGC 856

20041128 20041213

Circular No. 8454
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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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).