TITLE:   GCN CIRCULAR
NUMBER:  28407
SUBJECT: Swift GRB200909.97: Global MASTER-Net observations report 
DATE:    20/09/09 23:28:20 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@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-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) was pointed to the Swift GRB200909.97 (trigger No 995288,11h 40m 42.24s , -31d 10m 44.4s, R=0.05) errorbox  28 sec after notice time and 49 sec after trigger time at 2020-09-09 23:18:00 UT, with upper limit up to  15.9 mag. Observations started at twilight.  The observations began at zenith distance = 79 deg. The sun  altitude  is -12.4 deg. 

The galactic latitude b = 29 deg., longitude l = 286 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1437483

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      55 |         MASTER-OAFA |   C |    10 | 15.0 |        
      84 |         MASTER-OAFA |   C |    10 | 15.0 |        
     122 |         MASTER-OAFA |   C |    20 | 15.3 |        
     166 |         MASTER-OAFA |   C |    30 | 15.5 |        
     220 |         MASTER-OAFA |   C |    40 | 15.7 |        
     285 |         MASTER-OAFA |   C |    50 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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