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MASTER: bright PSN and bright dwarf novae outbursts

ATel #9174; P. Balanutsa, O. Gress, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez (IAC), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Kuznetsov (Lomonosov MSU), M. Serra Ricart, G. Israelyan (Instituto de Astrofísica de Canarias), S. Potter, A. Kniazev (The South African Astronomical Observatory), N. Budnev, K. Ivanov (Irkutsk State University)
on 21 Jun 2016; 08:26 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Referred to by ATel #: 9185

MASTER OT J211223.35+144645.1 discovery - PSN in 4.4" of GALEX galaxy

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 21h 12m 23.35s +14d 46m 45.1s on 2016-06-21.08257 UT.
The OT unfiltered magnitude is 16.2m (limit 18.1m).

The OT is seen in 3 images. We have reference image without OT on 2015-12-10.81226 UT with unfiltered magnitude limit 19.8m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/211223.35144645.1.png

MASTER OT J012303.34-492007.7 discovery - dwarf nova outburst, ampl>4m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 01h 23m 03.34s -49d 20m 07.7s on 2016-06-17.09588 UT.
The OT unfiltered magnitude is 16.5m (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 2015-10-10.89747 UT with unfiltered magnitude limit 20.5m.
There is USNO-B1 star in 0.3" with B2=18.71,R2=19.51,I=19.12, and GSC 2.3.2 blue mag 22.26 (at minimum?), it means the current outburst amplitude is more then 4m
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/012303.34-492007.7.png

MASTER OT J095958.98-190100.6 discovery - dwarf nova outburst, ampl>7m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 09h 59m 58.98s -19d 01m 00.6s on 2016-06-17.77954 UT.
The OT unfiltered magnitude is 13.3m (limit 18.8m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-04-12.80183 UT with unfiltered magnitude limit 19.8m.
There is USNO-B1 star with B=20.71,R=20.70 and GALEX source, it means the dwarf nova outburst with current amplitude more then 7m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/095958.98-190100.6.png
This OT is also presents at ASASSN page (undependent detection?)

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net