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MASTER: strange OT

ATel #10829; V. Gorelkina, V. Lipunov (Lomonosov MSU), V. Kornilov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, O. Gress, V. Shumkov, A. Kuznetsov, D. Vlasenko, V. Vladimirov, D. Kuvshinov, V. Chazov, I. Gorbunov, D. Zimnuhov, T. Pogrosheva (Lomonosov MSU, SAI)
on 6 Oct 2017; 19:53 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J061452.3+395200.6 detection - variable OT , Ampl>(2.1-5.5)m

MASTER-Tavrida auto-detection system
( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 06h 14m 52.3s +39d 52m 00.6s on 2017-10-01 02:31:43.324 UT.
The OT unfiltered magnitude is 16.5m .
The OT is seen in 6 images. There is no minor planet at this place.
This OT was reobserved in MASTER-Kislovodk on 2017-10-04_23:22:46/2017-10-05_01:02:19UT (8 images) with m_OT=17.2
We have reference image without OT on 2017-08-22.83006 UT with 19.8 unfiltered magnitude limit.
There is a big OT history in MASTER database since 2010, for example:
MASTER-Tunka (unfiltered=0.2B+0.8R by thousands USNO-B1 stars in field):
2016-12-12 19:13:33.881UT (4 images) with m_OT=17.8
2016-12-10 21:08:08 UT (8 images) with mlim=18.6 limit (without OT)
2016-12-06 16:17:16UT (6 images) with m_OT=16.0
There is only URAT! source OT in 2013y. in VIZIER database, it means more then 5.5mag amplitude of current outburst (see POSS images).
Spectral observations are required.
The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/MASTEROTJ061452.3+395200.6.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net