MASTER: QSO flare and dwarf novae

ATel #8956; A. Malkova, E. Gorbovskoy, O. Gress, V. Vladimirov, E. Popova, V. Lipunov(Lomonosov MSU), D. Buckley (SAAO), R. Rebolo (IAC), A. Tlatov (KSS), N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Shumkov, I. Gorbunov (Lomonosov Moscow State University, SAI), M. Serra Ricart, G. Israelian (IAC), S. Potter A. Kniazev (SAAO), V. Senik, D. Dormidontov A. Parkhomenko (Kislovodsk Solar Station, Pulkovo observatory)
on 15 Apr 2016; 18:54 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J121618.59+145308.9 discovery - QSO flare, ampl>6m
MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 12h 16m 18.59s +14d 53m 08.9s on 2016-04-14.99251 UT.
The OT unfiltered magnitude is 15.8m (limit 18.8m).
The OT is seen in 5 images. We have reference image without OT on 2016-01-10.07370 UT with unf. m_lim=20.5m.
This is a source from SDSS QSO candidates and NIR-matched QSO catalog (and a blue source with m_OT=21.84m in APM-North Catalog).
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/121618.59145308.9.png

MASTER OT J082553.24-663037.5 discovery - possible dwarf nova outburst, ampl>3.9m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 25m 53.24s -66d 30m 37.5s on 2016-04-13.82170 UT with unfiltered (w=0.2B+0.8R, calibrated to USNO-B1) m_OT=16.6m (the limit is 19.3m).
The OT is seen in 3 images. We have reference image without OT on 2015-03-14.88086 UT with unfiltered m_lim=20.1m.
There is USNO-B1 star with B2=20.05, R2=20.56, so we suggest the dwarf nova outburst with Ampl>3.9m.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/082553.24-663037.5.png

MASTER OT J182643.42+613816.2 discovery - dwarf nova outburst, ampl>3.4 now (4.5 in past)

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 26m 43.42s +61d 38m 16.2s on 2016-04-14.97014 UT.
The OT unfiltered magnitude is 18.6m (limit 20.1m).
The OT is seen in 5 images. We have reference image without OT on 2014-02-07 03:08:08 UT with unfiltered m_lim=19.5.
We have previous outbursts on 2011-08-18 16:24:30.888UT with m_OT=17.9 in MASTER-Tunka database, and on 2010-04-20 23:21:32.549UT with m_OT=17.5 in MASTER-Kislovodsk database.
There is a blue GSC 2.3.2 star with Bj=21.84, so we suggest the dwarf nova outburst with historical amplitude more then 4.5m and current one more then 3.4m.
The discovery and reference images are http://master.sai.msu.ru/static/OT/182643.42613816.2_1.png

MASTER OT J122201.31-271527.5 discovery - dwarf nova outburst, ampl>2.7

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 22m 01.31s -27d 15m 27.5s on 2016-04-13.94206 UT.
The OT unfiltered magnitude is 18.8m (limit 20.6m).The OT is seen in 3 images. There is no minor planet at this place.We have reference image without OT on 2015-02-14.92002 UT with unf. m_lim=21.2.
There is blue USNO-B1 star with known B=21.47. This is GALEX source, so we suggest the dwarf nova outburst with ampl>2.7m.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/122201.31-271527.5.png

MASTER OT J130648.42+015859.7 discovery - dwarf nova outburst, ampl>2.6m

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 13h 06m 48.42s +01d 58m 59.7s on 2016-04-12.15061 UT with unfiltered m_OT=19.4m (limit 20.4m).
The OT is seen in 3 images. We have reference image without OT on 2016-03-14.11192 UT with unfiltered magnitude limit 21.0m. There is no any known sources in VIZIER, it means 22m POSS limit and ampl>2.6m The discovery and reference images are http://master.sai.msu.ru/static/OT/130648.42015859.7.png

Spectral observations are required for all OT

MASTER Global Robotic Net