TITLE:   GCN CIRCULAR
NUMBER:  31268
SUBJECT: Fermi GRB 211219B: Global MASTER-Net observations report 
DATE:    21/12/20 05:15:13 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-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 GRB 211219B ( Fermi GBM team, GCN 31267) errorbox  25126 sec after notice time and 25134 sec after trigger time at 2021-12-20 04:48:40 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 37 deg. The sun  altitude  is -35.4 deg. 

The galactic latitude b = -39 deg., longitude l = 274 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1820147

We obtain a following upper limits.  

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

   25164 | 2021-12-20 04:48:40 |         MASTER-OAFA | (04h 23m 47.22s , -64d 09m 14.6s) |   C |    60 | 17.9 |        
   25446 | 2021-12-20 04:53:22 |         MASTER-OAFA | (04h 41m 43.78s , -64d 06m 58.4s) |   C |    60 | 17.7 |        
   25527 | 2021-12-20 04:54:42 |         MASTER-OAFA | (04h 39m 30.62s , -62d 12m 59.3s) |   C |    60 | 17.6 |        
   25606 | 2021-12-20 04:56:02 |         MASTER-OAFA | (04h 56m 12.55s , -62d 13m 23.7s) |   C |    60 | 17.7 |        
   25686 | 2021-12-20 04:57:21 |         MASTER-OAFA | (04h 42m 48.47s , -66d 01m 55.2s) |   C |    60 | 17.7 |        
   25971 | 2021-12-20 05:02:07 |         MASTER-OAFA | (05h 01m 59.43s , -66d 02m 11.3s) |   C |    60 | 17.5 |        
   26050 | 2021-12-20 05:03:26 |         MASTER-OAFA | (04h 07m 34.30s , -62d 15m 39.0s) |   C |    60 | 17.7 |        
   26335 | 2021-12-20 05:08:10 |         MASTER-OAFA | (04h 24m 17.72s , -62d 14m 19.0s) |   C |    60 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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