MASTER-SAAO: 6 optical transients

ATel #9063; P. Balanutsa, O. Gress, N. Tiurina, E. Popova, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, V. Kornilov, A. Kuznetsov, I. Gorbunov, V. Vladimirov, D. Kuvshinov (Lomonosov MSU, SAI), S. Potter, A. Kniazev(SAAO), V. Shumkov, S. Shurpakov, T. Pogrosheva(MASTER-team)
on 18 May 2016; 23:58 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J200130.53-100736.8 discovery - bright high amplitude CV(>5.5m) or SN in SDSS galaxy

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 20h 01m 30.53s -10d 07m 36.8s on 2016-05-16.94397 UT with unfiltered m_OT=16.3m (m_lim=18.7m).
The OT is seen in 3 images.We have reference without OT on 2016-05-14 03:30:422UT in MASTER-IAC database with mlim=20.0, and on 2015-04-25.06574 UT with mlim=19.3 in MASTER-SAAO database.
There are Sloan DSS star in 1.3" with red jmag=21.788 and galaxy in 6.7" with red jmag=18.242.
It can be both SN(but 1.9mag brighter the host galaxy in less then 2 days) and CV with ampl>5.5m at the begining of the outburst
Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/200130.53-100736.8.png

MASTER OT J192544.94-202113.1 discovery - bright dwarf nova outburst, Ampl>5.2m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 25m 44.94s -20d 21m 13.1s on 2016-05-16.92341 UT with unf. m_OT=16.8m (m_lim=18.7m), there are 3 images with OT.
We have reference without OT on 2015-08-15.78067 UT with unf.m_lim=19.3m. There is only GSC2.3.2 optical source in 0.6" with blue jmag=21.16 (and 22m POSS limit).And this source is an ultraviolet one(GALEX), so the amplitude this dwarf nova(possible outburst is more then 5.2m
The discovery images http://master.sai.msu.ru/static/OT/192544.94-202113.1.png

MASTER OT J183747.26-520558.2 - dwarf nova outburst, ampl>4.9m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 37m 47.26s -52d 05m 58.2s on 2016-05-15.91206 UT with unf. m_OT=17.1m (m_lim=19.2m). The OT is seen in 6 images. We have reference without OT on 2016-04-05.03545 UT, unf.m_lim=19.6m
There is only GSC2.3.2 star with blue jmag=21.6 (and marginally seen OT at blue POSS images), so the Ampl>4.9m
The discovery images http://master.sai.msu.ru/static/OT/183747.26-520558.2.png

MASTER OT J155833.96-232213.9 discovery - dwarf nova outburst, Ampl>3.6m, no VIZIER data

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 15h 58m 33.96s -23d 22m 13.9s on 2016-05-12.01422 UT with unf. m_OT=18.4m (lim=20.0m).
There are 3images with OT and reference image without OT on 2015-03-19.00118 UT ,unf.m_lim=20.2m.
There is no any known source in VIZIER database, so the outburst Ampl>3.6m
The discovery images http://master.sai.msu.ru/static/OT/155833.96-232213.9.png

MASTER OT J171812.59+060815.8 discovery - dwarf nova outburst, Ampl>4.6m, no VIZIER

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 17h 18m 12.59s +06d 08m 15.8s on 2016-05-16.92093 UT with unf.m_OT=17.4m (mlim=19.1m).
There are 4 images with OT and reference one without OT on 2015-04-30.00648 UT with unf.m_lim=18.4m.
There is no known sources in VIZIER database(22m POSS limits), so the outburst's Ampl>4.6m
The discovery image http://master.sai.msu.ru/static/OT/171812.59060815.8.png

MASTER OT J145417.82-351735.6 discovery - dwarf nova outburst, Ampl>4.7, no optical sources in VIZIER

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 54m 17.82s -35d 17m 35.6s on 2016-05-11.97119 UT with unfilt.m_OT=17.3m (limit 18.9m)
There are 3 images with OT and reference without OT on 2015-07-09.84811 UT, unf.m_lim=20.4m.
There is no known optical sources in VIZIER database, only UV GALEX (the accretion), so outburst Ampl>4.7m
The discovery http://master.sai.msu.ru/static/OT/145417.82-351735.6.png

Spectral observations are required for all OT.

MASTER Global Robotic Net