Electronic Telegram No. 1051
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 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://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2007bm, 2007bk, AND 2007gr
     G. Pignata, J. Maza, M. Hamuy, R. Antezana, and L. Gonzalez
report the following approximate R-band CCD magnitude estimates for
SN 2007bm in NGC 3672 (cf. CBET 936, 939; IAUC 8834) from exposures
taken in the course of the Chilean Robotic Supernova Search with the
0.41-m Panchromatic Robotic Optical Monitoring and Polarimetry
Telescopes (PROMPT) at Cerro Tololo:  Apr. 14.008 UT, [17.0; 21.236,
15.5 (independent discovery).  They provide the following position
for 2007bm:  R.A. = 11h25m02s.30 +/- 0".1, Decl. = -9o47'54".0 +/- 0".1
(equinox 2000), which is about 2".4 west and 11".0 south of the center
of the galaxy NGC 3672.

     H. Mikuz, Crni Vrh Observatory, reports the following additional
magnitudes for SN 2007bk (cf. IAUC 8834), obtained with the 0.60-m f/3.3
Cichocki reflector and the USNO-B1 R2 catalogue:  Apr. 28.014 UT, R =
16.90 +/- 0.04, B = 17.94 +/- 0.09; May 8.943, R = 17.14 +/- 0.04, B =
18.03 +/- 0.06; May 12.985, R = 17.27 +/- 0.04, B = 17.89 +/- 0.09;
May 14.864, R = 17.33 +/- 0.05, B = 17.69 +/- 0.06.

     Additional unfiltered CCD magnitudes for SN 2007gr in NGC 1058 (cf.
CBET 1034, 1036, 1041; IAUC 8864):  Aug. 10.710 UT, [19.0 (K. Itagaki,
Teppo-cho, Yamagata, Japan, 0.60-m f/5.7 reflector; communicated by S.
Nakano, Sumoto, Japan); 13.671, 14.5 (H. Noguchi, Katori, Chiba, Japan,
0.235-m Schmidt-Cassegrain reflector; communicated by H. Yamaoka,
Kyushu University); 14.766, 14.5 (Itagaki); 15.725, 13.9 (Itagaki).
Itagaki provides the following position for 2007gr from his images on
Aug. 14 and 15:  R.A. = 2h43m27s.96 +/- 0s.01, Decl. = +37o20'44".6
+/- 0".2 (equinox 2000.0).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 September 5                 (CBET 1051)              Daniel W. E. Green