MASTER-SAAO: 2 Dwarf Novae.

ATel #7395; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, D. Denisenko, E. Popova, V. Vladimirov, S. Shumkov, 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. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University)
on 14 Apr 2015; 22:56 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J113646.33-492417.1 discovery - new Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 11h 36m 46.33s -49d 24m 17.1s on 2015-04-12.92947 UT.

The OT unfiltered magnitude is 18.0m (the limit is 19.7m). The OT is seen in 4 images.
We have reference image without OT on 2015-02-22.83968 UT with 19.4 unfiltered magnitude limit.

There is no any known source inside 10" in VIZIER database and minor planet.

So the amplitude is about 4m and this OT can be dwarf nova (flare).

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/113646.33-492417.1.png

Spectral observations are required.

MASTER OT J084600.35-170041.9 discovery - Dwarf Nova flare of GALEX source

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 46m 00.35s -17d 00m 41.9s on 2015-04-13.91135 UT.

The OT unfiltered magnitude is 18.0m (the limit is 20.3m). There are 5 images with OT this night in MASTER-SAAO database. There is no minor planet at this place.

We have reference image without OT on 2015-02-17.06618 UT with 20.1 unfiltered magnitude limit and on 2015-01-22.799 with m_lim=19.8.

The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/084600.35-170041.9.png

There is only GALEX source with NUV=20.187 in VIZIER database. Using MASTER amplitude in 3m and CRTS history, this is a typically Dwarf Nova flare.

Spectral observations are required.

Global MASTER Robotic Net