[vsnet-grb-info 27281] Fermi trigger No 633963272: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29384
SUBJECT: Fermi  trigger No 633963272: Global MASTER-Net observations report 
DATE:    21/02/03 02:45:37 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  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, O.Ershova 
(Irkutsk State University, API),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich, Yu. Sergienko 
(Blagoveschensk Educational State University)




MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB210202.54 (trigger No 633963272,19h 48m 14.40s , +18d 44m 24.0s, R=2.8) errorbox  49098 sec after notice time and 49134 sec after trigger time at 2021-02-03 02:33:21 UT, with upper limit up to  15.7 mag. The observations began at zenith distance = 74 deg. The sun  altitude  is -26.3 deg. 

The galactic latitude b = -4 deg., longitude l = 56 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1538398

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   47687 | 2021-02-03 02:08:43 |             MASTER- | (19h 41m 12.07s , +16d 04m 04.1s) |   C |    60 | 12.4 |        
   48180 | 2021-02-03 02:16:56 |             MASTER- | (19h 50m 09.48s , +22d 04m 08.9s) |   C |    60 | 13.7 |        
   49164 | 2021-02-03 02:33:21 |      MASTER-Tavrida | (19h 28m 57.40s , +20d 08m 19.5s) |   C |    60 | 15.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.