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THE ASTRONOMER Electronic Circular No 2730      2011 Apr 10 18.36UT
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 2011bi IN MCG +07-35-37 = PSN J17100581+4222201
An e-mail received on April 4 indicated that Tom Boles of Coddenham, 
Enmgland had discovered an apparent supernova in MCG +07-35-37 during 
searches for the UK Nova/Supernova Patrol.

The object, of magnitude 17.1 was recorded on unfiltered CCD images 
taken on 2011 Apr 04.041 with a 0.35-m Schmidt-Cassegrain telescope. It 
is located at:
RA 17h 10m 05.81s DEC +42 22' 20.1" (2000), which is approximately 7.4"E 
and 2.1"N of the centre of the host galaxy. Nothing is present at this 
position on Tom's images from 2010 Oct 20 and 2011 Feb 7 (limiting mag 
19.5) nor on Digitised Sky Survey Plates from 1992-07-21 (limiting red 
mag 20.5), and 1989-07-02 (limiting blue mag 21.0).

A further e-mail provided details of confirmation on Apr. 5.116UT
With measured position end figures 05.83s, 20.3" and magnitude V = 17.1. 
The variable was designated PSN J17100581+4222201 when posted on the 
TOCP webpage and is now designated SN 2011bi based on the spectroscopic 
reports below.

G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), reports 
that a spectrum obtained on Apr. 4 UT by Marion with the F. L. Whipple 
Observatory 1.5-m telescope (+ FAST) shows that 2011bi is a type-IIP 
supernova approximately three weeks after the explosion.

J. Chen et. al., report an optical spectrum obtained on Apr. 8.80 UT 
with the 2.16-m telescope (+ OMR) at the Xinglong Station of the NAOC 
shows that 2011bi matches that of SN 2004et at 23 days after maximum.

Congratulations to Tom on this his 142nd supernova discovery.

Guy M Hurst