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MASTER-OAFA: bright OT with ampl>6.8m

ATel #10496; V. Shumkov, T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, O. Gress, V. Chazov, D. Vlasenko, V. Vladimirov, I. Gorbunov, A. Krylov, D. Kuvshinov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), A. Gabovich (BSPU)
on 15 Jun 2017; 22:43 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J190359.99-485254.6 discovery - bright high amplitude(>6.8m) OT

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 19h 03m 59.99s -48d 52m 54.6s on 2017-06-14 05:44:21.777 UT.
The OT unfiltered (W=0.2B+0.8R calibrated by thousands USNO-B1 stars) magnitude is 15.2m (mlim=18.1m).
The OT is seen in 8 images on 14th of Jun with m_OT=15.2, and on 8 images on 15th of Jun with m_OT=15.3.
We have reference image without OT on 2016-09-27.03297 UT with 19.5 unfiltered magnitude limit
Inside 5" there is only GSC2.3 star in 1.7" with known red Fmag=20.5(during previous outburst), so 22m POSS limit gives more then 6.8 of current outburst ampl
Spectral observations are required.
The discovery and reference images are available at:

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net