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THE ASTRONOMER Electronic Circular No 2344      2007 Jun 07 18.10UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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SUPERNOVA 2007cm IN NGC 4644
Discovery by W. Kloehr, Germany of a possible supernova (CBET 973):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007cm  May  24.02  12 42 45.18  +55 08 57.1  16.1   21.5"E,13.5"N
R. J. Foley, et. al., University of California, Berkeley, report that 
CCD spectra of May 24 with the 3-m Shane telescope
at Lick Observatory, shows this supernova to be of type IIn. A very blue 
continuum with low-equivalent-width hydrogen emission lines suggests 
that 2007cm is a young object.  At a distance of 70 Mpc its absolute 
magnitude is -16.7, indicating that 2007cm is a
true supernova explosion and not a "supernova imposter" (Van Dyk et al. 
2006, http://arxiv.org/abs/astro-ph/0603025).

Guy Hurst reports that a 60-second unfiltered image obtained with the 
Bradford Robotic Telescope on 2007 June 1.894UT resulted in a measured 
magnitude of 16.8 (+/-0.1).

SUPERNOVA 2007cn IN UGC 11953
Discovery by LOSS of a possible supernova (CBET 973):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007cn  May  29.48  22 13 55.79  +13 45 23.9  18.0    2.4"W, 3.9"N

SUPERNOVA 2007bd CORRECTION
With reference to the discovery announcement of supernova 2007bd 
mentioned on TA E-Circular 2336, the host galaxy is UGC 4455 and not UGC 
6332 as previously stated.

Guy M Hurst