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THE ASTRONOMER Electronic Circular No 2771      2011 Oct 05 19.12UT
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 2011gn IN MCG +13-5-36
On 2011 Sept 30 Tom Boles reported the discovery of an apparent 
supernova in MCG +13-5-36 during searches for the UK Nova/Supernova 
Patrol for which later confirmatory images were obtained. The object of 
magnitude 18.0 (unfiltered) recorded with a 0.35-m Schmidt-Cassegrain 
telescope is located at:

RA  07h 06m 28.29s DEC +77o 52' 31.8" (2000), about 2.4"W and 20.3" N of 
the nucleus of the galaxy also catalogued as PGC 20157. It was later 
designated SN 2011gn on CBET 2848.

Additional magnitudes: 1989 Dec. 17, [20.5 (Digitized Sky Survey red 
plate); 1996 Dec. 12, [21.0 (Digitised Sky Survey blue plate);
2010 Dec. 6, [19.5 (Boles); 2011 Feb. 12, [19.5 (Boles); Sept. 30.855, 
17.0 (Nick D. James, Chelmsford, Essex, England; Celestron C11 telescope 
+ ST9-XE camera; position end figures 28.31s, 31.6").

S. Valenti et. al. Osservatorio Astronomico di Padova and Andrea 
Pastorello, Dipartimento di Astronomia, Universita di Padova report on 
CBET 2848 that a spectrogram obtained on 2011 Oct. 1.05 UT with the 
Ekar-Copernico 1.82-m telescope shows that the best fit is with the 
type-Ia supernova 2003du at three weeks after maximum.  With a derived 
redshift of 0.029, the expansion velocity measured from the minimum of 
Si II 635.5-nm doublet is 10000 km/s.

Congratulations to Tom on the discovery of his 144th supernova.

Guy M Hurst