MASTER: OTs detection

ATel #12814; T. Pogrosheva, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Francile (OAFA SJNU), H. Levato (ICATE SJNU), E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, D. Zimnukhov, A. Kuznetsov, D. Vlasenko, V. Vladimirov, I. Gorbunov, A. Chasovnikov, F. Balakin, V. Grinshpun (Lomonosov MSU), R. Rebolo, M. Serra (IAC), O. Gress, N. Budnev, O. Ershova (ISU), V. Yurkov, Y. Sergienko, A. Gabovich (BSPU), V. Senik, A. Tlatov, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory RAS)
on 28 May 2019; 18:51 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J192107.32-483245.5 detection - outburst with ampl>5.2m
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 19h 21m 07.32s -48d 32m 45.5s on 2019-05-28.36017 UT.
The OT unfiltered magnitude is 14.4m (mlim=18.7m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference images
with m_OT=19.6 at 2018-09-05.11525 UT (unfiltered magnitude limit 20.0m),
and without OT at 2019-05-28 08:34:10UT with mlim=19.3.
It means that amplitude of current outburst is more then 5.2m

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/192107.32-483245.5.png

MASTER OT J173957.07-201506.4 - possibly YSO
MASTER-OAFA auto-detection system found OT source at (RA, Dec) = 17h 39m 57.07s -20d 15m 06.4s on 2019-05-27.28409 UT with unfiltered m_OT=15.6m (mlim=17.6m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2018-04-15.18168 UT with mlim=17.8m.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/173957.07-201506.4.png

IR sources detected in optic:
MASTER OT J180617.85-170819.8 - ampl~3m
MASTER-Kislovodsk auto-detection system found OT source at (RA, Dec) = 18h 06m 17.85s -17d 08m 19.8s on 2019-05-25.82243 UT
The OT unfiltered magnitude is 14.3m (limit 17.4m).
The OT is seen in 2 images and there are 2 images in MASTER-SAAO at 2019-05-26 00:50:46.579 with m_OT=14.4.
We have reference images with m_OT~17.7 on 2019-02-21 05:37:57UT (MASTER-IAC),
without OT with m_lim~17.4 on 2018-04-14.98044 UT.
Discovery and reference images: http://master.sai.msu.ru/static/OT/180617.85-170819.8.png

MASTER OT J173045.95-344454.7
MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 17h 30m 45.95s -34d 44m 54.7s on 2019-05-27.35891 UT with unfiltered magnitude 16.5m (mlim=18.6m).
The OT is seen in 3 images.We have reference image without OT on 2018-06-08.24853 UT with unfilt.mlim=17.9m.
Our automatic photometry:
Date_Time_UT unfiltered_m_OT 2017-08-25 02:21:52 15.4
2018-05-18 00:59:23 17.8
2019-05-27 08:36:50 16.5
Discovery and reference images: http://master.sai.msu.ru/static/OT/173045.95-344454.7.png

MASTER OT J172835.59-340123.2
MASTER-OAFA auto-detection system found OT source at (RA, Dec) = 17h 28m 35.59s -34d 01m 23.2s on 2019-05-27.36152 UT with unfiltered magnitude 18.0m (mlim=18.7m).
The OT is seen in 2 images.
We have reference image without OT on 2017-08-25.08377 UT with mlim=19.8m.
Discovery and reference images: http://master.sai.msu.ru/static/OT/172835.59-340123.2.png

MASTER Global Robotic Net