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MASTER-Amur: new bright dwarf nova outburst

ATel #9640; E. Popova, V. Lipunov (Lomonosov MSU), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, O. Gress, K. Ivanov, V. Chazov, D. Kuvshinov, D. Vlasenko (Lomonosov MSU), A. Gabovich, V. Yurkov, Yu. Sergienko (BSPU), V. Shumkov, T. Pogrosheva (MASTER-Team)
on 17 Oct 2016; 15:04 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J225009.67+501411.2 discovery - new bright dwarf nova outburst, ampl>5.6m, no VIZIER data

MASTER-Amur (located in Blagoveschensk, Amur river, Far East, Russia) auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 22h 50m 09.67s +50d 14m 11.2s on 2016-10-17.43137 UT.
The OT unfiltered magnitude is 16.4m (limit 18.1m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2016-04-04.78373 UT with unfiltered magnitude limit 18.1m. There is no any sources inside 5" in VIZIER database, it means 22m POSS limit and more then 5.6m of current outburst
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ225009.67+501411.2.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net