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MASTER: 3 optical transients

ATel #8964; P. Balanutsa, T. Pogrosheva, V. Lipunov(Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, V. Shumkov, I. Gorbunov, O. Gress(Lomonosov Moscow State University, SAI), S. Potter A. Kniazev (SAAO)
on 17 Apr 2016; 08:43 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J103432.65-385135.3 discovery - new dwarf nova outburst, ampl>4.5m
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 10h 34m 32.65s -38d 51m 35.3s on 2016-04-15.84756 UT.
The OT unfiltered magnitude is 17.5m (limit 19.3m).
The OT is seen in 3 images. There is no minor planet at this place.We have reference image without OT on 2015-01-23.84998 UT with unfiltered magnitude limit 19.8m.There is no known sources inside 5" in VIZIER, it means the 22m POSS limit and more then 4.5mag amplitude of this outburst
Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/103432.65-385135.3.png

MASTER OT J124456.34-271030.4 discovery - dwarf nova, ampl>3.8m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 44m 56.34s -27d 10m 30.4s on 2016-04-15.81300 UT.
The OT unfiltered magnitude is 18.4m (limit 19.2m)
The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-02-14.95067 UT with unfiltered magnitude limit 20.6m.
There is only GSC2.3.2 with blue 22.18m and GALEX source, so we suggest the dwarf nova outburst Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/124456.34-271030.4.png

MASTER OT J113216.79-492853.0 discovery - new dwarf nova outburst, ampl>4.6m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 32m 16.79s -49d 28m 53.0s on 2016-04-16.05932 UT.

The OT unfiltered magnitude is 17.4m (limit 19.0m).
The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2015-02-22.82583 UT with unfiltered magnitude limit 19.9m.
There is no VIZIER sources, so the ampl of outburst is more then 4.6m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/113216.79-492853.0.png

MASTER Global Robotic Net