[vsnet-alert 15712] MASTER OT J131320.24+692649.1 (AETL)

[Taichi Kato]

ATEL #5065							     ATEL #5065

Title:	Bright CV discovered by MASTER
Author:	D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N.
		Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov,
		V. Yecheistov (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, A. Frolova (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), P. Podvorotny, V. Shumkov,
		S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C.
		Mallamaci, C. Lopez and F. Podest (OAFA)
Queries:	lipunov2007 at gmail.com
Posted:	14 May 2013; 19:35 UT
Subjects:Optical, Cataclysmic Variable, Transient

MASTER OT J131320.24+692649.1 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 13h
13m 20.24s +69d 26m 49.1s on 2013-05-14.58892 UT. The OT unfiltered magnitude
is 
14.7m
(limit 18.5m). The OT is seen in 2 images. There is no minor planet at
this place. We have reference image without OT on 2012-12-22.86316 UT with
unfiltered magnitude limit 18.9m. 

There is a blue star within 1" of the OT on the digitized Palomar plates
which is present in USNO-B catalogue as USNO-B1.0 1594-0116928 (13 13 20.230
+69 26 49.66 R1=19.64 R2=19.80) and USNO-B1.0 1594-0116930 (13 13 20.416
+69 26 49.13 B1=19.98 R1=19.87 B2=20.38). Color-combined (BRIR) DSS finder
chart is uploaded to http://master.sai.msu.ru/static/OT/J131320+692649-BRIR.jpg
(10'x10' FOV). The OT also has an UV counterpart GALEX J131320.3+692648
(FUV=20.71+/-0.26 NUV=20.60+/-0.19). The object is not present in 1RXS,
2MASS, GCVS and AAVSO VSX. This area of sky is not covered by SDSS. No
previous outbursts were detected by Catalina Sky Survey. 

Based on the outburst amplitude (~5m), blue color and UV counterpart we
suggest that MASTER OT J131320.24+692649.1 is most likely a new cataclysmic
variable (dwarf nova). Follow up observations are required. The discovery
and reference images are available at: http://master.sai.msu.ru/static/OT/131320.24692649.1.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