TITLE:   GCN CIRCULAR
NUMBER:  32166
SUBJECT: Fermi GRB 220606B: Global MASTER-Net observations report 
DATE:    22/06/06 01:30:25 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

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

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


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 220606B ( Fermi GBM team, GCN 32165) errorbox  720 sec after notice time and 754 sec after trigger time at 2022-06-06 01:16:03 UT, with upper limit up to  19.3 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -53.7 deg. 

The galactic latitude b = -66 deg., longitude l = 287 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1997640

We obtain a following upper limits.  

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

     785 | 2022-06-06 01:16:03 |         MASTER-SAAO | (01h 27m 52.53s , -50d 19m 46.2s) |   C |    60 | 19.0 |        
     875 | 2022-06-06 01:17:34 |         MASTER-SAAO | (01h 40m 26.17s , -50d 17m 58.4s) |   C |    60 | 19.2 |        
     957 | 2022-06-06 01:18:55 |         MASTER-SAAO | (01h 24m 27.36s , -48d 24m 22.5s) |   C |    60 | 19.3 |        
    1265 | 2022-06-06 01:24:03 |         MASTER-SAAO | (01h 36m 29.45s , -48d 26m 09.1s) |   C |    60 | 19.3 |        
Filter C is a clear (unfiltred) band. 


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