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MASTER: 2 Dwarf Novae discovery.

ATel #7362; P. Balanutsa, V. Shumkov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova, S. Shurpakov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), O. Gress, K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University)
on 10 Apr 2015; 17:04 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J104708.93-432829.5 discovery - Dwarf Nova flare

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 10h 47m 08.93s -43d 28m 29.5s on 2015-04-09.83035 UT.

The OT unfiltered magnitude is 18.7m (limit is 19.7m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2015-03-18.87252 UT with unfiltered magnitude limit 21.3m.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/104708.93-432829.5.png

MASTER164710.25-692460.0 discovery - Dwarf Nova flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 16h 47m 10.25s -69d 24m 60.0s on 2015-04-09.99854 UT.

The OT unfiltered magnitude is 16.9m (the limit is 18.6m). The OT is seen in 6 images. There is no minor planet at this place.

We have reference image without OT on 2015-02-06.03646 UT with 18.0m unfiltered magnitude limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/164710.25-692460.0.png

The USNO-B1 and GSC star is in 4.5" , its position is too far from MASTER position and this flare is from very faint blue source in DSS Blue plate (up to 22m), so this MASTER OT amplitude is about 5m.

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net