[vsnet-alert 15216] Two bright OTs detected by MASTER (ATEL 4682)

[Taichi Kato]

   The SDSS colors of the second object suggests a Porb of 0.07 d
(by the method in PASJ 64, 62).  The first one is also a good
candidate for a short-Porb dwarf nova.

===

ATEL #4682							     ATEL #4682

Title:	Two bright OTs detected by MASTER
Author:	P. Balanutsa, V. Yecheistov,  D. Denisenko, V. Lipunov, E.
		Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V.
		Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI),
		V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural
		Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov,
		O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University),
		A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar
		station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko,
		D. Varda, E. Sinyakov (Blagoveshchensk Educational University), V.
		Shumkov,  S. Shurpakov, P. Podvorotny (MASTER team members), H. Levato,
		C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio
		Astronomico Felix Aguilar; OAFA)
Queries:	lipunov2007 at gmail.com
Posted:	27 Dec 2012; 16:02 UT
Subjects:Optical, Cataclysmic Variable

MASTER OT J030128.77+401104.9 - new bright CV 

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 03h
01m 28.77s +40d 11m 04.9s on 2012-12-27.47380 UT. 
The OT unfiltered magnitude is 15.1m (limit 17.9m). 

The OT is seen in 2 images. There is no minor planet at this place. 

We have reference image without OT on 2011-09-06.79588 UT with magnitude
limit in 'V' filter 19.2m. 

Nothing is present at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 
1RXS, GCVS and in AAVSO VSX. There is a faint star (~21m) within 1" of

the OT on digitized POSS plates. Color-combined (BRIR) finder chart is

posted at http://master.sai.msu.ru/static/OT/J030128+401104-BRIR5x5.jpg

This area of sky is not covered by SDSS and GALEX. No previous 
outbursts were detected on 6 Palomar/NEAT images obtained on 1997 Nov.

30 and 2002 Nov. 15, as well as on Catalina Sky Survey images. 

Based on the amplitude of variability (about 6m) we conclude that 
MASTER OT J030128.77+401104.9 is a new cataclysmic variable in 
outburst. Follow up observations are required. 

The discovery and reference images are available at: 
http://master.sai.msu.ru/static/OT/030128.77401104.9.png 

MASTER OT J105025.99+332811.4 - dwarf nova

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 10h
50m 25.99s +33d 28m 11.4s on 2012-12-25.72405 UT. 
The OT unfiltered magnitude is 16.4m (limit 17.8m). 

The OT is seen in 2 images. There is no minor planet at this place. 

We have reference image without OT on 2012-10-19.85023 UT with unfiltered
magnitude limit 18.5m. 

The OT was also detected by MASTER-Kislovodsk on 3 images (60-sec 
exposures) taken on Dec. 21. The following unfiltered magnitudes were 
measured: 

2012-12-19.677  16.3  MASTER-Amur

2012-12-19.709  16.3  MASTER-Amur

2012-12-21.013  16.4  MASTER-Kislovodsk

2012-12-21.014  16.5  MASTER-Kislovodsk

2012-12-21.015  16.0  MASTER-Kislovodsk

2012-12-25.693  16.4  MASTER-Amur

2012-12-25.724  16.4  MASTER-Amur

This OT is identical to the blue star <a 
href="http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237665129072689776

">SDSS J105025.99+332812.9</a> (u=22.74 g=22.53 r=22.29 i=22.56 
z=22.63). Nothing is present at this position in USNO-B1.0, GSC 2.3.2,

2MASS, 1RXS and GCVS catalogs, as well as in AAVSO VSX. No previous 
outbursts were detected by CRTS and Palomar/NEAT. 

Based on the amplitude of variability (about 6m) and blue color at 
quiescence we conclude that MASTER OT J105025.99+332811.4 is a new 
cataclysmic variable (dwarf nova) in outburst. Follow up observations 
are encouraged. 

The discovery and reference images are available at: 
http://master.sai.msu.ru/static/OT/105025.99332811.4.png 

<center><A HREF="http://observ.pereplet.ru/MASTER_OT.html">List of optical
transients discovered by MASTER</A></center>

Global MASTER Robotic Net: http://observ.pereplet.ru