MASTER: dwarf novae outburst detection

ATel #12306; T. Pogrosheva, O. Gress, V. Lipunov (Lomonosov MSU), R. Podesta, F. Podesta, C. Francile, C. Lopez (OAFA, SJNU), H. Levato (SJNU), D. Buckley (SAA), R. Rebolo Lopez, M. Serra-Ricart (IAC), E. Gorbovskoy, V. Kornilov, N. Tiurina, A. Kuznetsov, V. Vladimirov, P. Balanutsa, D. Vlasenko, A. Chasovnikov (Lomonosov MSU)
on 18 Dec 2018; 09:50 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J073051.19-191608.9 detection - dwarf nova outburst, ampl>4.3m

ASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 13h 08m 43.37s -36d 40m 22.1s on 2018-12-17.28001 UT.
The OT unfiltered magnitude is 16.7m (mlim=18.5m).
The OT is seen in 6 images. There is no minor planet at this place.
We have reference images without OT on 2017-08-03 01:16:11UT with 19.5 unfiltered magnitude limit, on 2017-04-20 20:30:47UT with mlim=21.0(MASTER-SAAO), the nearest in time on 2018-09-03 23:34:54UT with mlim=18.6 .
It means more then 4.3mag amplitude of current outburst.
There is GSC2.3.2 star in 2" with red_fmag=20.14 and blue_jmag=20.27, and GALEX source in 2.6".
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/130843.37-364022.1.png

MASTER OT J073051.19-191608.9 detection - dwarf nova outburst with ampl>4mag

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 07h 30m 51.19s -19d 16m 08.9s on 2018-12-16.10727 UT.
The OT unfiltered magnitude is 16.0m (mlim=18.2m).
The OT is seen in 4 images (01:39:06.425-02:34:28.147UT). There is no minor planet at this place.
We have reference image without OT on 2017-12-24 22:22:02 UT with 19.4 unfiltered magnitude limit (MASTER_SAAO).
There is PanSTARR source in 0.167" with rmag=20.8, it means more then 4mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/073051.19-191608.9.png

MASTER Global Robotic Net