MASTER-OAFA: OT with ampl>5m
T. Pogrosheva, V. Lipunov (Lomonosov MSU),  R. Podesta (OAFA), H. Levato (ICATE), V. Kornilov, E. Gorbovskoy, N. Tiurina, I. Gorbunov, P. Balanutsa,  A. Kuznetsov,  V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress (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)
MASTER OT J211135.76-345242.9 discovery - possibly dwarf nova outburst, ampl>5m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 21h 11m 35.76s -34d 52m 42.9s on 2018-07-20.22941 UT. The OT unfiltered magnitude is 17.0m (mlim=18.9m). The OT is seen in 14 images (2018-07-20 05:26:38.874-07:53:09.781 UT). We have reference image without OT on 2017-08-28.06878 UT with 19.8 unfiltered magnitude limit. There is no OT inside 3". There is WISE source in 4.2". USNO-B1 limit gives more then 5m of current outburst amplitude (MASTER W=0.2B+0.8R by USNO-B1 thousands field stars). Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/211135.76-345242.9.png

Current outburst: MASTER OT J081809.50-634348.3 - on 2018-07-25 23:37:24.705 with unfiltered m_OT=16.0 https://www.aavso.org/vsx/index.php?view=detail.top&oid=400256
optical,cataclysmic variable,nova,star,transient,variables,request for observations