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MASTER-SAAO: outburst with ampl>3.4m

ATel #13294; T. Pogrosheva, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Vladimirov, V. Shumkov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik (Lomonosov MSU),R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), R. Podesta, C. Lopez, F. Podesta, C. Francile(OAFA), H. Levato(ICATE), D. Buckley(SAAO), O. A. Gres, N. M. Budnev, O. Ershova(ISU, API), A. Tlatov, D. Dormidontov(Kislovodsk Solar Station of the Pulkovo Observatory),V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk ESU)
on 18 Nov 2019; 11:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J184405.54-533315.2 detection - prelim. dwarf nova outburst with ampl>3.4m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 18h 44m 05.54s -53d 33m 15.2s on 2019-11-16.79432 UT.
The OT unfiltered magnitude is 17.0m (mlim17.9=).
The OT is seen in 3 images (19:03:49-19:46:13). There is no minor planet at this place.
We have reference image on 2019-08-03.86583 UT with unfiltered mlim= 20.4m, on 2019-10-18 21:23:35 with mlim=19.3, on 2019-11-04 19:36:16 with mlim=18.0.
There is previous outburst on 2019-07-05 21:50:31UT, 2019-07-04 21:21:41UT with m_OT=17.7.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/184405.54-533315.2.png

MASTER Global Robotic Net