TITLE:   GCN CIRCULAR
NUMBER:  31253
SUBJECT: Fermi  trigger No 661417475: Global MASTER-Net observations report 
DATE:    21/12/17 13:00:20 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, 
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),

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

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


MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB211217.29 (trigger No 661417475,00h 35m 31.20s , +04d 27m 00.0s, R=5.73) errorbox  18345 sec after notice time and 18353 sec after trigger time at 2021-12-17 12:10:24 UT, with upper limit up to  16.9 mag. The observations began at zenith distance = 55 deg. The sun  altitude  is -43.6 deg. 

The galactic latitude b = -58 deg., longitude l = 117 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1817362

We obtain a following upper limits.  

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

   18384 | 2021-12-17 12:10:24 |         MASTER-Amur | (00h 09m 50.87s , +02d 35m 58.3s) |   C |    60 | 16.6 |        
   18384 | 2021-12-17 12:10:24 |         MASTER-Amur | (00h 17m 03.52s , +03d 07m 28.9s) |   C |    60 | 16.5 |        
   18463 | 2021-12-17 12:11:43 |         MASTER-Amur | (00h 55m 48.00s , +06d 24m 28.5s) |   C |    60 | 16.9 |        
   18463 | 2021-12-17 12:11:43 |         MASTER-Amur | (01h 03m 06.52s , +06d 55m 50.9s) |   C |    60 | 16.6 |        
Filter C is a clear (unfiltred) band. 


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