MASTER-IAC, MASTER-SAAO: optical transients discoveries

ATel #9488; V. Shumkov, P. Balanutsa, T. Pogrosheva, J. Rabinovich, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M. Serra Ricart (IAC), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, O. Gress, K. Ivanov, D. Vlasenko, S. Shurpakov, D. Kuvshinov (Lomonosov MSU, SAI)
on 12 Sep 2016; 11:59 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J233043.39-020414.8 discovery - bright dwarf nova outburst, Ampl>5.2m

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 23h 30m 43.39s -02d 04m 14.8s on 2016-09-08.984185 UT.
The OT unfiltered magnitude is 16.8m (the limit is 20.1m).
The OT is seen in 5 images. We have reference image without OT on 2015-09-11.93303 UT with unfiltered mlim=19.5m.
This OT is seen on MASTER-IAC image on
2016-09-06 22:28:18.837 with m_OT=18.5.
There is only GALEX source (in 2.1") in VIZIER database (accretion to WD), it means 22m POSS limits in history and more then 5.2mag current dwarf nova outburt's amplitude
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/233043.39-020414.8.png

MASTER OT J042726.19-241135.0 detection - dwarf nova outburst, ampl>2.9m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 04h 27m 26.19s -24d 11m 35.0s on 2016-09-08.06190 UT.
The OT unfiltered magnitude is 19.1m (mlim=20.7m).
The OT is seen in 2 image. There is no minor planet at this place.
We have reference image without OT on 2016-04-10.73990 UT with unfiltered mlim=20.4m. There is GALEX source in 0.8", there is no USNO-B1 detection (previous outbursts at USNOA2 in 1983 and GSC2.3 in 1980), so current outburst is more then 2.9m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/042726.19-241135.0_1.png

MASTER OT J053539.23-613750.1 discovery - possib. dwarf nova outburst, ampl>3.1m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 05h 35m 39.23s -61d 37m 50.1s on 2016-09-04.09472 UT.
The OT unfiltered magnitude is 18.9m (mlim=20.4m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2016-04-30.80124 UT with unfiltered mlim=20.3m.
There is no known optical sources in VIZIER database, it means 22m POSS limits and more then 3.1m current outburst
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/053539.23-613750.1_1.png

MASTER OT J195905.68+034720.8 discovery - OT with ampl>3.9m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 59m 05.68s +03d 47m 20.8s on 2016-08-29.83785 UT.
The OT unfiltered magnitude is 18.1m (mlim=19.4m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2015-05-14.99465 UT with unfiltered magnitude limit 19.3m.
There is no sourcs in USNO-B1, it means current ampl>3.9m.
There is 2mass source with J=16.647, H=16.015, K=15.506.
Spectral observations are required.
http://master.sai.msu.ru/static/OT/MASTEROTJ195905.68+034720.8.jpg

MASTER Global Robotic Net