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MASTER: bright optical transient

ATel #10035; V. N.Sidorenkov, V. M.Lipunov, V. G.Kornilov, V. V.Chazov, E. G.Berezhko, A. A.Klypin, E. Yu. Shafer, I. V.Mironova, V. P.Esin, V. L.Gundorov, A. V.Charikov, G. A.Aitova, Yu. M.Gektin, E. M.Trunkovsky, N. A.Lipunova, A. O.Popova, I. A.Gerasimov, Yu. V.Gluschenko (Lomonosov Moscow State University, Physics Department)
on 1 Feb 2017; 10:33 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J014450.47+453242.9 discovery - bright (16.9m) optical transient with Ampl>5.1m

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 01h 44m 50.47s +45d 32m 42.9s on 2017-01-29.03010 UT.
The OT unfiltered magnitude is 16.9m (mlim=19.5m).
The OT is seen in 6 images on 2017-01-29 00:02:30-00:43:21UT with the same magnitude (i.e. not UVCet), and on 2017-02-01 10:15:01.977UT (MASTER-Amur) with m_OT=17.0. There is no minor planet at this place.
We have reference images without OT on 2016-08-11 03:38:55 UT with 19.8m unfiltered magnitude limit (MASTER-IAC), on 2016-12-30 19:31:26UT (MASTER-Kislovodsk) with mlim=20.3. There is no OT in MASTER-Kislovodsk,-Tunka,-Amur database since 2010-11-01 23:24:48UT with mlim=20.0
POSS 22m limit without OT gives more then 5.1m value of current outburst's amplitude (preliminary dwarf nova)
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ014450.47453242.9.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net