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MASTER-SAAO: 2 optical transients

ATel #7838; P. Balanutsa, E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), V. Kornilov, A. Kuznetsov, N. Tiurina, V. Chazov, V. Vladimirov, I. Gorbunov, D. Vlasenko (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, N. M.Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 25 Jul 2015; 01:04 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J145057.70-433233.6 - possible new dwarf nova in outburst with Ampl>5.4m

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 14h 50m 57.70s -43d 32m 33.6s on 2015-07-18.75478 UT. The OT unfiltered magnitude is 16.6m (the limit 19.6m).
The OT is seen in 4 images. There is no minor planet at this place. We have reference images without OT on 2015-02-28.04793 UT with 20.0 unfiltered magnitude limit and on 2015-03-30.992UT with m_lim=19.5. There is no any source inside 5" in VIZIER database.So we can suggest dwarf nova outburst with Amplitude more then 5.4
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/145057.70-433233.6.png

MASTER OT J084116.61-604743.6 discovery - possible new dwarf nova in outburst with Ampl>3.9m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 41m 16.61s -60d 47m 43.6s on 2015-07-18.70979 UT. The OT unfiltered magnitude is 18.1m (limit 18.8m).
The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2015-02-22.93765 UT with 20.9 unfiltered magnitude limit.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/084116.61-604743.6.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net