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THE ASTRONOMER Electronic Circular No 2860      2012 Oct 08 18.16UT
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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MASTER OT J054317.95+093114.8
P. Balanutsa et. al., Moscow State University report on The Astronomer's 
Telegram 4446 that the MASTER-Amur auto-detection system discovered an 
OT source at:
RA 05h 43m 17.95s DEC +09 31m 14.8s on 2012 Sept 30.7851UT

The OT unfiltered magnitude is 13.4 (limiting magnitude 17.9) on two 
images. There was no minor planet at this place.

A reference image without the optical transient taken on 2011 Nov 
02.73236 UT reached  a V limit of 18.8. There is a faint star (magnitude 
~21) within 1.5" from the position of the OT visible on POSS-II plates.

Colour-combined (BRIR) DSS finder chart is uploaded to 
http://master.sai.msu.ru/static/OT/J0543+0931-BRIR.jpg
(10'x10' FOV).

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS 
and GCVS catalogs and in AAVSO VSX. This area is not covered by SDSS, 
CSS and GALEX. Nothing is visible on the sum of 3 NEAT images of this 
filed taken on 2001 Sep. 23 (limiting magnitude 20.5).

The galactic latitude is 10.5 deg. Based on the amplitude of variability 
(more than 7 magnitudes) we suggest that MASTER OT
J054317.95+093114.8 is likely a cataclysmic variable (dwarf nova or 
classical Nova) in outburst.

Follow up observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/054317.95093114.8.png

Guy M Hurst