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MASTER-Amur: new OT

ATel #10723; O. Gress, V. Lipunov (Lomonosov MSU), A. Gabovich (BSPU), V. Kornilov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, I. Gorbunov, V. Chazov, D. Vlasenko, V. Shumkov, T. Pogrosheva (Moscow State University, SAI), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko (Blagoveshchensk Educational University)
on 9 Sep 2017; 08:34 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J023414.54+454307.3 discovery - new OT, possibl.dwarf nova outburst, ampl>5.7m

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 34m 14.54s +45d 43m 07.3s on 2017-09-08.74044 UT.
The OT unfiltered magnitude is 16.3m (limit is 17.8m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-10-08.74078 UT with unfiltered magnitude limit 18.0m, on 2014-08-22 22:32:28UT with mlim=19.8 in MASTEr-Kislovodsk database.
There is no any sources in VIZIER database, it means 22m POSS limit in history and more then 5.7mag of current outburst's amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://observ.pereplet.ru/images/MASTER023414.54+454307.3.jpg

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