MASTER OT J144603.45-413156.7: GRB 200803B possible optical counterpart

ATel #13920; V. Vladimirov, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, V. Kornilov, I. Gorbunov, N. Tiurina, O. Gress, A. Gabovich, A. Kuznetsov, F. Balakin, V. Vladimirov, A. Chasovnikov, A. Pozdnyakov, K. Zhirkov, E. Minkina, D. Zimnukhov, V. Senik, D. Kuvshinov, T. Pogrosheva, D. Vlasenko, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, F. Podesta, C. Francile (OAFA), H. Levato (ICATE), R. Rebolo, M. Serra (IAC), N. Budnev (ISU, API), A. Tlatov (KSS of the Pulkovo Observatory), Yu. Sergienko, V. Yurkov(BSPU), V. Shumkov
on 6 Aug 2020; 14:27 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J144603.45-413156.7 discovery - GRB 200803B optical counterpart or outburst with ampl>4.1m, no VIZIER data

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During Fermi GRB 200803B inspection (Fermi GCN #28201, Lipunov et al. GCN #28208, GCN #28204),
started 27 sec after notice time (55 sec after trigger time) at 2020-08-03 16:53:38 UT with upper limit up to 18.6 mag,
we found possible optical counterpart , see cover map and OT position

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 14h 46m 03.45s -41d 31m 56.7s on 2020-08-03.70644 UT.
The OT unfiltered magnitude is 17.9m (mlim=18.1).
The OT is seen in 5 inspect images. There is no any known sources in VIZIER and minor planet at this place
We have reference image on 2017-05-28.87608 UT with unfiltered mlim=20.9m.
Spectral observations are required (it also can be MilkyWay's CV, short OT or PSN in 52" from 6df galaxy (z=0.05128, B=16.96,R=15.97, too far but can be).
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/144603.45-413156.7.png
Spectral observations and deep photometry are required.

MASTER Global Robotic Net