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MASTER-OAFA: new OT during inspection

ATel #10017; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, O. Gress, P. Balanutsa, V. Kornilov, T. Pogrosheva, V. Vladimirov (Lomonosov MSU), C. Saffe (ICATE), C. Lopez, F. Podesta (OAFA)
on 28 Jan 2017; 09:53 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J223915.60-633430.2 discovery - new OT (no Vizier), Ampl>4.7m

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 22h 39m 15.60s -63d 34m 30.2s on 2017-01-27.11698 UT.
The OT unfiltered magnitude is 17.3m on 2017-01-27 02:28:03,02:48:27UT (limit=18.9m).
The OT is seen in 2 inspection images, we have only 2 images of this area in this night. There is no minor planet at this place.
We have reference image without OT on 2016-07-30.21171 UT with unfiltered magnitude limit 20.0m.
There is no any known sources in VIZIER database, so Ampl of current outburst is more then 4.3m

This OT was detected inside 5deg circle during inspection of Fermi trigger 507173752 https://gcn.gsfc.nasa.gov/other/507173752.fermi . GRBtime=2017-01-27 01:35:47.79UT, GRB is short, so this OT (about 1h after the GRB time) can't be the optical counterpart

Spectral observations are required.
The discovery and reference images are http://observ.pereplet.ru/images/MASTEROTJ223915.60-633430.2.jpg

During MASTER-OAFA survey there is also
MASTER OT J172354.27-650402.4 detection - long periodical variable star at (RA, Dec) = 17h 23m 54.27s -65d 04m 02.4s on 2017-01-27.30920 UT with unfiltered m_OT=16.0 (MASTER-OAFA).

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net