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THE ASTRONOMER Electronic Circular No 2937      2013 Aug 09 10.16UT
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 J204723.04+072759.1 - NEW BRIGHT CATACLYSMIC
S. Shurpakov et. al., Moscow State University report on The Astronomer's
Telegram 5255 the discovery of  MASTER OT J204723.04+072759.1 by the
MASTER-Amur auto-detection system.
The optical transient (OT) is located at:
RA 20h 47m 23.04s DEC +07d 27' 59.1" (2000) and was recorded o 2013 Aug
5.606UT. The OT unfiltered magnitude is 15.5m (limit 18.2m). The OT is seen
in six images. They have a reference image without the OT on 2013 Apr.
21.807UT with unfiltered magnitude limit 16.5m. 

The OT is located within 1.5" of the faint blue star which is present on
digitised Palomar plates and in USNO-B catalogue as USNO-B1.0 0974-0693904
(20 47 22.960 +07 28 00.20, B1=20.56 B2=21.42). There is a ~17.5m star 6"
East (in PA~100) of the OT which can contaminate the measured magnitude of
the new variable. Color-combined (BRIR) DSS finder chart is uploaded to
http://master.sai.msu.ru/static/OT/J204723+072759-BRIR5x5.jpg

The object has an UV counterpart GALEX J204723.0+072800 (FUV=21.17+/-0.34,
NUV=21.51+/-0.27). There is nothing at this position in 2MASS, 1RXS, GCVS
and AAVSO VSX. The nearest known variable star is NN Del (eclipsing binary
with the highly eccentric orbit) 10' away. No previous outbursts were
detected by Catalina Sky Survey. This area of sky in Delphinus is not
covered by SDSS. 

Based on the UV detection by GALEX and outburst amplitude (~5.5m) we
conclude that MASTER OT J204723.04+072759.1 is a new cataclysmic variable,
most likely a dwarf nova of UGSU (SU UMa) type in superoutburst.

SUPERNOVA 2013dz (ROTSE)
2013dz  Jly 11.42   02 58 24.40  +36 17 03.5  16.2   2.8"W    1.5"N
M. Shetrone: spectrum July 13 type-IIn  

SUPERNOVA 2013ea (S. SHURPAKOV)
2013ea  Jly  9.94   01 20 16.45  +30 10 55.7  16.9   
Dave Balam: spectrum July 14 type-Ia near maximum

Guy M Hurst