MASTER: new OT, with ampl>3.5

ATel #12165; T. Pogrosheva, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), V. Kornilov, E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Vladimirov, P. Balanutsa, V. Chazov, D. Zimnukhov, D. Vlasenko (Lomonosov Moscow State University, SAI), O. Gress, N. Budnev (API ISU), A. Gabovich (BSPU), V. Shumkov, R. Rebolo Lopez, M. Serra-Ricart (IAC), R. Podesta, F. Podesta, C. Francile (OAFA), H. Levato (San Juan National University, Argentina), A. Tlatov, V. Senik (KSS, Pulkovo observatory)
on 3 Nov 2018; 15:51 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J003130.15-193724.2 discovery - new OT (dwarf nova?), ampl>3.6m (no VIZIER data)

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 00h 31m 30.15s -19d 37m 24.2s on 2018-11-02.92084 UT.

The OT unfiltered magnitude is 18.4m (mlim=20.2). The OT is seen in 18 images (2018-11-02 22:06:01.573-23:50:24.848UT)

We have reference images on 2017-10-22.80413UT 20.4m (MASTER-SAAO), and:

Date_UT unfiltered_mlim MASTER-observatory

2018-09-21 03:58:38 18.5 MASTER-OAFA
2018-08-08 23:27:57 19.1 MASTER-Tavrida
2016-12-29 02:42:27 19.1 MASTER-OAFA
2016-09-24 02:07:18 20.1 MASTER-OAFA
2016-07-15 23:25:05 19.4 MASTER-Kislovodsk
2015-10-11 01:30:20 19.8 MASTER-IAC
2015-01-22 19:04:33 19.4 MASTER-SAAO
2014-11-14 21:08:11 19.6 MASTER-Kislovodsk
2013-12-24 15:30:18 18.5 MASTER-Kislovodsk
2009-08-28 22:22:50 19.0 MASTER_Kislovodsk_Rfilter(Johnson)

Spectral observations are required.
There is no any sources in VIZIER database, it means 22m POSS limit in history and more then 3.6 current outburst amplitude
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/003130.15-193724.2.png

MASTER Global Robotic Net