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MASTER-SAAO: 2 Dwarf Novae discovery

ATel #7355; V. Shumkov, O. Gress (ISU), V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), 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), S. Shurpakov (MASTER-Team)
on 8 Apr 2015; 17:11 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J092341.40-215809.5 discovery - new Dwarf Nova (no known VIZIER source)

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 09h 23m 41.40s -21d 58m 09.5s on 2015-04-07.93587 UT. The OT unfiltered magnitude is 17.2m (the limit is 19.0m).

The OT is seen in 3 images. There is no minor planet at this place, no any source at VIZIER database inside 25". It means, the amplitude is 4-5m.

We have reference images without OT on 2014-12-23.96696 UT with unfiltered magnitude limit 20.0m, on 2015-02-16.0954UT with m_lim=19.8 .

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/092341.40-215809.5.png

Spectral observations are required.

MASTER OT J075927.68-860929.5 discovery - Dwarf Nova flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 59m 27.68s -86d 09m 29.5s on 2015-04-02.88172 UT. The OT unfiltered magnitude is 17.1m (limit 18.3m). The OT is seen in 5 images.

The OT is seen on 2015-04-05.775 with unfiltered m_OT=16.8, and on 2015-04-06.852 with unfiltered m_OT=17.0

We have reference image without OT on 2015-01-05.98906 UT with unfiltered magnitude limit 18.9m.

This OT can be identified with the 0038-0016820 USNO-B1 star with B2=20.11 R2=19.09.

The discovery and reference images are available at: List of Optical Transients discovered by MASTER

MASTER Global Robotic Net