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MASTER: bright OT during Fermi trigger inspection

ATel #10819; V. Shumkov, V. Lipunov (Lomonosov MSU), N. Budnev, O. Gress (ISU), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, D. Vlasenko, V. Vladimirov, D. Kuvshinov, V. Chazov, I. Gorbunov, D. Zimnuhov (Lomonosov MSU, SAI)
on 5 Oct 2017; 08:41 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Gamma Ray, Request for Observations, Cataclysmic Variable, Gamma-Ray Burst, Transient, Variables

MASTER OT J062010.45+544657.8 - new OT inside Fermi trigger error box, Ampl>5.9mag

MASTER-Tunka auto-detection system
( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 06h 20m 10.45s +54d 46m 57.8s on 2017-09-28.56648 UT.
The OT magnitude in unfiltered is 16.1m (limit 18.2m).
The OT is seen in 6 inspection images. There is no minor planet at this place.

This OT was detected during MASTER inspection of Fermi 528294089 trigger (GRB_time 17/09/28 12:21:24.31 UT , https://gcn.gsfc.nasa.gov/other/528294089.fermi )
We have reference image without OT on 2017-08-22.83006 UT with 19.8 unfiltered magnitude limit.
There is no any known sources in VIZIER, it means more then 5.9mag amplitude of current outburst. Deep photometry and spectral observations are required.
The discovery and reference images are available at

MASTER Global Robotic Net