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MASTER: 2 dwarf novae

ATel #7041; P. Balanutsa , V. Shumkov, V. Lipunov, E. Gorbovskoy(Lomonosov MSU, SAI), D. Buckley (SAAO), S. Antipin, V. Kornilov, A. Kuznetsov, N. Tiurina , D. Denisenko (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (South African Observatory), O. Gress , K. Ivanov, N. Budnev, S. Yazev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), S. Shurpakov (MASTER team members)
on 10 Feb 2015; 16:15 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT 085958.73-632213.0 - possible Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 08h 59m 58.73s -63d 22m 13.0s on 2015-02-09.997 UT. The OT unfiltered magnitude is 16.5m ( the limit is 19.1m).

There are 4 images with OT. There is reference image at MASTER-SAAO database with a 19.6m unfiltered magnitude limit on 2015-01-18.001UT .

There is no any object inside 10” in Vizier database. There is no minor planet in this place.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ085958.73-632213.0.jpg

Spectral observations are required.

MASTER OT J024917.47+460031.6- possible Dwarf Nova

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 02h 49m 17.47s +46d 00m 31.6s on 2015-02-09.620 UT. The OT unfiltered magnitude is 17.1m (the limit is 19.1m).

There are 3 images with OT on 2015-02-09, and there are 2 bursts in 2012-09-18.819 (m_OT=17.6m) and in 2011-11-08.633 (m_OT=16.7m) in MASTER-Tunka database.

We have reference image without OT on 2011-12-16.636 UT with 19.3 unfiltered magnitude limit, and about 200 images without OT during 2014-2010 in MASTER Database with the limits from 17.6 up to 19.3.

This OT is identified to SDSSJ024917.44+460031.4 with Rmag=20.946, Imag=20.591. So the burst amplitude is about 3m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ024917.47+460031.6.jpg

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net