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).