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MASTER-OAFA optical transient

ATel #10789; O. Gress, V. Lipunov (Lomonosov MSU), R. Podesta, F. Podesta, C. Francile (OAFA), H. Levato, C. Saffe (ICATE), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, P. Balanutsa, V. Vladimirov, D. Kuvshinov, I. Gorbunov, V. Shumkov (Lomonosov MSU)
on 27 Sep 2017; 20:25 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J224511.29-373158.4 discovery - new OT dwarf nova? ampl > 4.9m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 22h 45m 11.29s -37d 31m 58.4s on 2017-09-27.07968 UT.
The OT unfiltered magnitude is 17.1m (mlim=19.5m).
The OT is seen in 2 images. There is no minor planet at this place.
We reobserved it in MASTER-SAAO on 2017-09-27 19:56:24UT, m_OT=17.1
We have reference image without OT on 2017-08-31.15064 UT with unfiltered magnitude limit 19.9m.
There is no any sources in VIZIER database, it means 22m POSS limit in history and more then 4.9m of current Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/224511.29-373158.4.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net