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THE ASTRONOMER Electronic Circular No 2819      2012 May 05 20.12UT
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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OPTICAL TRANSIENT MASTER184809.40+395440.5
P. Balanutsa et. al., Moscow State University and others report 
discovery on The Astronomer's telegram 4084 of a cataclysmic variable 
with a preliminary designation of MASTER OT 184809.40+395440.5

The MASTER-Kislovodsk auto-detection system discovered the source at:
RA 18h 48m 09.40s DEC +39d 54m 40.5s on 2012 April 30.952UT.
The OT unfiltered magnitude is 16.0m (limit 19.7m).

The OT is seen in 4 images. There is no minor planet at this position. 
There are two SDSS DR8 stars within 3-4 arcsec offset with rmag >20. A 
reference image without the optical transient of 2011-08-31.718UT has an 
unfiltered magnitude limit 19.9m.

The discovery and reference images are available at:
http://observ.pereplet.ru/images/184809.40395440.5.png

SUPERNOVA 2012ax (CSS)
2012ax  Feb 18.43   11 11 58.35  +29 42 05.5  18.4   1.1"W,  11.5"N
L. Tomasella: spectrum March 16 type-Ia about one month after maximum.

SUPERNOVA 2012ay (CSS)
2012ay  Feb.24.32   09 43 25.71  -06 53 35.9  18.1
L. Tomasella: spectrum March 16 type-Ia about one month after maximum.

SUPERNOVA 2012az (CSS)
2012az  Mar 13.12   03 08 52.09  +17 18 03.2  17.4  15.1"E,  15.8"S
L. Tomasella: spectrum March 16 type-Ia around maximum.

SUPERNOVA 2012ba IN ESO 328-46 (CHASE)
2012ba  Jan 21.33   15 22 25.12  -38 12 04.2  16.6   7.3"E,   6.3"S
N. Morrell: spectrum March 2 type-Ic past maximum. The absolute 
brightness at discovery was magnitude -18.5; the latter is an upper 
limit to the intrinsic luminosity, considering the correction for dust 
extinction.  Depending on the phase of discovery, this could have been a 
very luminous event.

Guy M Hurst