MASTER: 3 OT outbursts discovery

ATel #12569; P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, V. Vladimirov, A. Kuznetsov, V. Kornilov, D. Vlasenko, O. Gress, V. Topolev, E. Davydova (Lomonosov Moscow State University, SAI), R. Rebolo, V. Yurkov, A. Gabovich, Yu. Sergienko (BSPU), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA SJNU), H. Levato, (ICATE SJNU), T. Pogrosheva
on 12 Mar 2019; 16:39 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J121253.11-371237.48 discovery - new OT, ampl>5.6m (no VIZIER data)

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 12h 12m 53.11s -37d 12m 37.48s on 2019-03-10 03:09:19.403UT.
There are two inspect images at this night:

Date_UT, unfiltered_OT_magnitude
2019-03-10 03:09:19.403 16.4
2019-03-10 03:21:08.637 16.4

There are images without OT on 2019-01-21 05:57:46UT with mlim=18.7, on 2015-04-12 22:37:13UT with mlim=20.4.
There is no any sources in VIZIER database, it means 22m POSS limit and more then 5.6 magnitude of current outburst amplitude.
Spectral observations and deep photometry are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ121253.11-371237.48.jpg

MASTER OT J122436.34-500952.7 discovery - preliminary dwarf nova outburst, ampl > 4.5m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 24m 36.34s -50d 09m 52.7s on 2019-03-11.98549 UT.
The OT unfiltered magnitude is 18.1m (mlim=19.7).

The OT is seen in 5 images in MASTER-SAAO history:

2019-03-01 00:57:41 m_lim=20.0
2019-03-02 01:37:43 m_OT=17.5
2019-03-11 23:39:06 m_OT=18.1
2019-03-11 23:50:13 m_OT=18.1
2017-03-27 22:20:33 m_OT=18.0

We have reference image on 2016-05-27.78659 UT with unfiltered mlim= 20.2m.

There is no USNO-B1 sources in history, it means 22m POSS limit and more then 4.5mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/122436.34-500952.7.png

MASTER OT J114602.92-483130.0 detection - dwarf nova outburst, ampl>4.3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 46m 02.92s -48d 31m 30.0s on 2019-03-11.93902 UT.

The OT unfiltered magnitude is 15.9m (mlim=20.1).
The OT is seen in 2 images (2019-03-11 22:32:11, 22:43:22UT). There is no minor planet at this place.
We have reference images without OT on 2019-03-07 23:10:14UT with mlim=19.8, on 2019-03-06 22:36:03UT with mlim=20.1, on 2019-03-02 23:14:50 with mlim=20.2, so the amplitude of current outburst is more then 4.3 magnitude

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/114602.92-483130.0.png

MASTER Global Robotic Net