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MASTER-OAFA: OTs

ATel #10551; T. Pogrosheva, P. Balanutsa, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, O. Gress, V. Vladimirov, D. Vlasenko, D. Kuvshinov (Lomonosov Moscow State University, SAI), F. Podesta, C. Francile (OAFA), C. Saffe (ICATE), A. Gabovich (BSPU)
on 1 Jul 2017; 15:07 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J204657.11-694523.6 discovery - dwarf nova? with ampl>3.5m

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 20h 46m 57.11s -69d 45m 23.6s on 2017-06-30.21138 UT.
The OT unfiltered magnitude is 19.0m (mlim=19.8m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-09-30.24641 UT with magnitude limit in 'BLANK' filter 20.0m.
There is only GSC 2.3 star with known blue jmag=22.56, it means current outburst amplitude's value is more then 3.5
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/204657.11-694523.6.png


MASTER OT J155542.85-191147.8 discovery - dwarf nova outburst, ampl>4.1

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 15h 55m 42.85s -19d 11m 47.8s on 2017-06-15.07531 UT.
The OT unfiltered magnitude is 17.9m (mlim=19.6m).

The OT is seen in 4 images. There is no minor planet at this place.
We have reference image without OT on 2017-05-21.05551 UT with unfiltered m_limit = 19.3m.
There is only USNO-A2 star with B=16.9,R=17.4 in 1.9", it means 22m USNO-B1 limit and more then 4.1mag of current outburst amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/155542.85-191147.8.png

MASTER OT J172354.82-650405.0 detection
at (RA, Dec) = 17h 23m 54.82s -65d 04m 05.0s on 2017-06-15.22954 UT. The OT unfiltered magnitude is 17.5m (mlim=18.0m), 6 images, there is IRAS source.
http://master.sai.msu.ru/static/OT/172354.82-650405.0.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net