MASTER optical follow up to Swift/Maxi 4U 1543-47detection

ATel #14719; A. Chasovnikov, V. Lipunov, V. Kornilov, K. Zhirkov, P. Balanutsa, I. Gorbunov, N. Tiurina, O. Gress, A. Kuznetsov, V. Vladimirov, E. Gorbovskoy, D. Vlasenko, D. Zimnukhov, V. Senik, V. Topolev, D. Kuvshinov (Lomonosov Moscow State University), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), N. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 15 Jun 2021; 16:56 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
started Swift-BAT Trigger 1055000 (GRB 210612.54, Evans et al. GCN #30222; Ttrigger= 13:01:32UT, source is 4U 1543-47)
optical observations after sunset at nearest observatory at 2021-06-12 16:23:38UT at MASTER-SAAO and continued at MASTER-IAC and MASTER-OAFA (Lipunov et al. GCN #30224) at 12-15 of June.

This source activity was also detected in Xray by MAXI (Negoro et al. ATel #14701) at at 12:00 on June 11, 2021.

Swift-UVOT published optical detection in UV filters since 2021-06-14 07:56:36UT ( Raman et al., Atel #14715)
We detected this bright variable source MASTER OT J154708.10-474008.7 (+-1/5", there is very bright neighboring star), at all images, for ex., with automatically detected m_OT~14.0 at 2021-06-12 23:16:21UT
Observation and reduction will be continued.

MASTER Global Robotic Net