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MASTER-SAAO discovery: 2 optical transients

ATel #7508; V. Shumkov, P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, A. Kuznetsov, V. Kornilov, V. Chazov, V. Vladimirov, D. Denisenko (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, 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), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University), S. Shurpakov (MASTER-Team)
on 14 May 2015; 19:07 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J162230.05-312131.8 discovery - Dwarf Nova outburst, Ampl>4.5m

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 16h 22m 30.05s -31d 21m 31.8s on 2015-05-13.84451 UT. The OT unfiltered magnitude is 16.4m (the limit is 19.0m).

The OT is seen in 4 images. There is no minor planet at this place.

We have reference image without OT on 2015-04-14.01764 UT with 19.7 unfiltered magnitude limit.

There is no any known object at this coordinates, so the amplitude of this dwarf nova outburst is more than 4.5m.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/162230.05-312131.8.png

MASTER OT J124541.87-390311.2 - red dwarf flare (UVCet type)

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 45m 41.87s -39d 03m 11.2s on 2015-05-12.89648 UT. The OT unfiltered magnitude is 18.1m (the limit is 20.4m).

There are 3 images with this OT (no minor planet at this place):
2015-05-12.896 18.1
2015-05-12.904 18.3
2015-05-12.911 18.5

This OT is marginally seen (under the limit) on 2015-05-13.776UT with m_lim=20.3

We have reference image without OT on 2015-03-15.05949 UT with 19.7 unfiltered magnitude limit.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ124541.87-390311.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net