V. Lipunov, V.Kornilov, E.Gorbovskoy, N.Tiurina, P.Balanutsa,A.Kuznetsov,K.Zhirkov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, A.Chasovnikov,A.Pozdnyakov,
V.Topolev, D.Cheryasov(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, 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),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,
vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to
the GRB201221.78 133 sec after notice time and 208 sec after trigger time
at 2020-12-21 18:45:02 UT. On our 11-th (180s exposure) set , obtained
1451 sec after tigger time at 2020-12-21 19:05:45 UT, we haven`t found
optical transient within Swift error-box (ra=278.204 dec=34.4108 r=0.05).
The 5-sigma upper limit has been about 13.6mag
The message may be cited.
The galactic latitude b = 18 deg., longitude l = 63 deg.
The observations made on zenith distance = 69 deg.The moon (48 % bright
part) is 56 deg. above the horizon. The distance between moon and object
Observations started at twilight.
The sun altitude is -11.4 deg.
The object can be observed till sunrise at 2020-12-22 07:52:15
The 5-sigma upper limit has been about 14.9mag The message may be cited.