MASTER: bright optical transients

ATel #12868; O. Ershova, T. Pogrosheva, V. Shumkov, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta, C. Lopez, C. Francile, F. Podesta (OOAFA, SJNU), H. Levato (ICATE, SJNU), R. Rebolo, M. Serra (IAC), N. Tiurina, E. Gorbovskoy, A. Kuznetsov, O. Gress, I. Gorbunov, P. Balanutsa, V. Kornilov, V. Vladimirov, D. Zimnukhov, F. Balakin, A. Chasovnikov, V. Topolev, V. Senik, V. Grinshpun, T. Pogrosheva, D. Kuvshinov (Lomonosov MSU), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (BSPU), N. M. Budnev, O. Ershova (API ISU), A. Tlatov, D. Dormidontov, A. V. Parhomenko (KSS of the Pulkovo Observatory)
on 13 Jun 2019; 18:38 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J133646.72-454952.3 discovery - outburst amplitude is more then 4.7m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 13h 36m 46.72s -45d 49m 52.3s on 2019-06-12 18:34:44.386 UT.

The OT unfiltered magnitude is 17.3m (mlim=19.0).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2019-06-10 17:56:07UT with mlim=19.5, on 2017-03-02.94057 UT with unfiltered mlim= 20.0m.

There is no USNO-B1, it means 22m limit in history and more then 4.7m of current outburst amplitude

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/133646.72-454952.3.png

MASTER OT J182528.48-454703.4 discovery - ampl of outburst is more then 5.2
AT 2019hef
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 25m 28.48s -45d 47m 03.4s on 2019-06-08.82772 UT.
The OT unfiltered magnitude is 16.8m (mlim=19.0).
The OT is seen in 2 images. There is no minor planet at this place.
There is no OT on 2019-06-07 08:53:41UT (2 images) in MASTER-OAFA
We have reference image on 2017-05-06.12384 UT with unfiltered mlim= 19.4m.
There is also no UNSO-B1 sources, it means 22m limit in history and >5.2m ampl
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/182528.48-454703.4.png

MASTER OT J130356.36-433229.5 detection - ampl>4.9
2019hlq
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 03m 56.36s -43d 32m 29.5s on 2019-06-07.81256 UT. The OT unfiltered magnitude is 17.7m (mlim=20.0). The OT is seen in 8 images.
2019-06-01 18:51:35.712 17.1
2019-06-06 18:19:16.556 17.6
2019-06-07 19:40:56.815 17.7
2019-06-12 18:27:20.931 18.3
We have reference image on 2015-05-12.85609 UT with unfiltered mlim= 20.9m.
There is no USNO-B1 sources, it means more then 4.9m of current outburst ampl
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/130356.36-433229.5.png

MASTER OT J183709.85-521359.3 detection - ampl >5.2m
2019hlo
MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 18h 37m 09.85s -52d 13m 59.3s on 2019-06-10.23993 UT.
The OT unfiltered magnitude is 16.8m (mlim=18.6m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2017-06-19.11168 UT with unfiltered magnitude limit 19.7m.
There is no USNO-B1 sources, 22m limit in history, ampl >5.2m (MASTER W=0.2B+0.8R by USNO-B1 thousands field stars) .
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/183709.85-521359.3.png

Known variables
MASTER OT J015151.85+140046.8 detection - BG Ari current outburst
m_OT=16.5 on 2019-06-13.18806 UT, 4 images, http://master.sai.msu.ru/static/OT/015151.85140046.8.png
AAVSO data

MASTER Global Robotic Net