-------------------------------------------------------------------
THE ASTRONOMER Electronic Circular No 2813      2012 Apr 09 19.55UT
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
-------------------------------------------------------------------
MASTER OT J174305.70+231107.8
P. Balanutsa et. al., Moscow State University and others report on 'The 
Astronomer's Telegram 4022' that the MASTER-Amur auto-detection system 
has discovered an optical transient source at:
RA 17h 43m 05.70s DEC +23 11' 07.8".

On 2012 Apr 5.83111UT the transient was of magnitude 15.6 (limit of 
exposure 17.5) and recorded on two images.
There is no minor planet at this place.  They have reference image 
without the OT on 2010 May 15 (23:54:39UT) with unfiltered magnitude 
limit 20.2m (MASTER-Kislovodsk site).

There is a blue star in USNO catalog at the position of MASTER OT
J174305.70+231107.8 which was brighter on the 1st epoch Palomar images 
taken on 1951 June 27:

USNO-B1.0 1131-0296601
17 43 05.747 +23 11 08.36  pmRA=0  pmDE=0
B1=19.30 R1=18.55 B2=20.21 R2=20.09 I=N/A

We have found four previous outbursts of this CV in the publicly 
available survey data:
Palomar/NEAT: 2003 July 28 (16.2m) fading to 17.1m by 2003 Aug. 07;
2005 July 26 (17.5m).
Caltech CRTS: 2007 May 15 (16.1m) and 2008 Apr. 08 (16.6m).

Reported magnitudes are unfiltered with the Red (USNO-B1.0) zero point.

The object is not present in AAVSO VSX, 2MASS, 1RXS and catalogues. Its 
position is not covered by SDSS and GALEX.

Based on the blue colour, outburst amplitude and archival light curve we 
conclude that MASTER OT J174305.70+231107.8 is a new cataclysmic 
variable (dwarf nova) in outburst. Photometric time series are 
encouraged.

The discovery and reference images are available at:
http://observ.pereplet.ru/images/MASTER120753.01+455635/MASTER120753.01+4
55635.jpg

SUPERNOVA 2012aq (CSS)
2012aq  Feb 24.54   14 54 05.13  +22 05 40.6  17.7    -        -
S. Valenti: spectrum Feb 29 normal type-Ia supernova similar to SN 1995E 
around maximum.

SUPERNOVA 2012ar (CSS)
2012ar  Mar  1.49   16 20 36.02  -10 27 38.3  16.6   7.1"W,  27.8"N
E. Y. Hsiao: near-inrared spectrum Mar 3 type-Ia a few days before 
maximum light.

Guy M Hurst