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MASTER-OAFA: new OT

ATel #10988; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Podesta(OAFA), H. Levato (ICATE), D. Buckley (SAAO), V. Kornilov, N. Tiurina, E. Gorbovskoy, T. Pogrosheva, O. Gress, A. Kuznetsov, V. Vladimirov, D. Zimnuhov, D. Vlasenko, P. Balanutsa, I. Gorbunov (Lomonosov MSU), F. Podesta (OAFA), C. Saffe (ICATE), V. Senik (KSS), A. Gabovich (BSPU)
on 19 Nov 2017; 23:18 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J195821.41-524929.3 discovery - new OT, Ampl>4.7m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 19h 58m 21.41s -52d 49m 29.3s on 2017-11-19.05767 UT.
The OT unfiltered magnitude is 17.9m (mlim=18.9m).
The OT is seen in 2 image. MASTER-SAAO reobserved it on 2017-11-19 19:25:35.418UT , unfiltered m_OT=17.3
We have reference image without OT on 2016-08-06.11499 UT with 20.1 unfiltered magnitude limit.
There is no known sources in VIZIER database, it means 22m limit in POSS images 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/195821.41-524929.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net