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MASTER: optical transients detection

ATel #10191; P. Balanutsa, S. Shurpakov, T. Pogrosheva, V. Lipunov (Lomonosov MSU),D. Buckley(SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, V. Chazov, I. Gorbunov, D. Vlasenko, V. Vladimirov, D. Kuvshinov (Lomonosov Moscow State University, SAI), K. Ivanov, N. Budnev , O. Gress (API, ISU)
on 21 Mar 2017; 21:18 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J184906.73-273334.9 detection - possibly CV, Ampl>2.2
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 18h 49m 06.73s -27d 33m 34.9s on 2017-03-18.14205 UT.
The OT unfiltered magnitude is 16.3m (mlim=18.2). The OT is seen in 5 images. There is no minor planet at this place.
We have reference image on 2016-08-20.92815 UT with unfiltered mlim= 18.5m, it means more then 2.2m of current amplitude. There is USNO-B1 star with R1=18.37, B2=19.21
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/184906.73-273334.9.png

MASTER OT J062452.36+094142.0 discovery
MASTER-Tunka auto-detection system d.iscovered OT source at (RA, Dec) = 06h 24m 52.36s +09d 41m 42.0s on 2017-03-19.62172 UT.
The OT unfiltered magnitude is 17.3m (limit 18.9m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2015-02-08.71139 UT with unfiltered mlim=18.4m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/062452.36094142.0.png

MASTER OT J192154.64-290457.6 - bright outburst, dwarf nova? Ampl>2.5m
MASTER-SAAO auto-detection system detected OT source at (RA, Dec) = 19h 21m 54.64s -29d 04m 57.6s
detected on the 2017-03-18 00:31:52.421Ut with unfiltered m_OT=13.0. There are 6 images with OT in this state.
The reference (in minimum) image was on the 2016-05-14 21:47:35.689UT with m_OT=15.5.
The discovery and reference images and automatic light curve is http://master.sai.msu.ru/static/OT/MASTEROTJ192154.64-290457.6.png

MASTER Global Robotic Net