[vsnet-grb-info 28363] Fermi trigger No 647942198: MASTER optical afterglow detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30466
SUBJECT: Fermi  trigger No 647942198: MASTER optical afterglow  detection
DATE:    21/07/18 08:52:30 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, T. Pogrosheva,  V.Kornilov, E. Gorbovskoy, 
N.Tyurina, P.Balanutsa,V.Vladimirov, A.Kuznetsov,
D. Vlasenko, I.Gorbunov,  D.Zimnukhov, V.Senik,V.Topolev,
F.Balakin, D.Cheryasov (Lomonosov Moscow State University,SAI,
PhysicsDepartment),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
R. Podesta, F. Podesta, C.Francile (Observatorio 
Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)

MASTER-OAFA robotic telescope  (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan 
National University) started inspect of the Fermi GRB210714.33 (trigger No 
647942198) errorbox  150 sec after 
notice time and 181 sec after trigger time at 2021-07-14 07:59:34 UT, with 
upper limit up to  19.5 mag (Lipunov et al., GCN CIRCULAR 30461).

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic 
Net", Advances in Astronomy, 2010, 30L )
  discovered fast fading  OT source at

(RA, Dec) = 20h 53m 57.98s -53d 08m 20.3s on  2021-07-14.35751 UT.

The OT  unfiltered  magnitude   is 16.1m
(mlim1 = 8.7).

The OT is seen in 6 images. There is no minor planet at this place.

We have reference image on 2016-07-30.14890 UT with 'BLANK' filter 20.3m.

Follow up  observations are required.