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MASTER: two optical transients

ATel #7705; M. Anderson (MASTER-team), O. Gress (ISU), V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, V. Kornilov, N. Tiurina, S. Antipin, A. Kuznetsov, P. Balanutsa, V. Chazov, E. Popova, D. Vlasenko, V. Vladimirov (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 24 Jun 2015; 14:53 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J083244.44-214911.5 discovery - dwarf nova outburst with Ampl>4.3m (no VIZIER source)

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 08h 32m 44.44s -21d 49m 11.5s on 2015-06-21.71565 UT.
The OT unfiltered magnitude is 17.7m. There are 10 images with m_OT=17.7 on 2015-06-21 and 14 images with m_OT=17.8 on 2015-06-22.(706 - 731) UT . There is no minor planet at this place.
We have reference image without OT on 2014-12-23.95579 UT with 19.7 unfiltered magnitude limit.
There is no any source in VIZIER database, so we can suggest the dwarf nova outburst with Ampl > 4.3m .
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/083244.44-214911.5.png

MASTER OT J212011.77-800924.5 discovery - UVCet type flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 21h 20m 11.77s -80d 09m 24.5s on 2015-06-20.82007 UT.
The OT unfiltered magnitude is 18.0m (limit 19.9m).
The OT is seen in 6 images. We have reference image without OT on 2015-01-21.84219 UT with unfiltered magnitude limit 19.9m.

Spectral observations are required.

The discovery and reference images and flare photometry are available at: http://master.sai.msu.ru/static/OT/212011.77-800924.5.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net