[vsnet-grb-info 24559] Swift GRB200107.81: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26658
SUBJECT: Swift GRB200107.81: Global MASTER-Net observations report 
DATE:    20/01/07 19:36:25 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),

H.Levato 
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),

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-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) was pointed to the Swift GRB200107.81 (trigger No 948219,07h 08m 15.74s , -83d 42m 56.5s, R=0.05) errorbox  18 sec after notice time and 69 sec after trigger time at 2020-01-07 19:27:38 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -18.0 deg. 

The galactic latitude b = -27 deg., longitude l = 296 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1253647

We obtain a following upper limits.  

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

      75 |         MASTER-SAAO |  P\ |    10 | 16.5 |        
      98 |         MASTER-SAAO |  P\ |    20 | 16.9 |        
     126 |         MASTER-SAAO |  P\ |    20 | 16.9 |        
     159 |         MASTER-SAAO |  P\ |    30 | 17.0 |        
     203 |         MASTER-SAAO |  P\ |    40 | 17.3 |        
     256 |         MASTER-SAAO |  P\ |    50 | 17.3 |        
     319 |         MASTER-SAAO |  P\ |    60 | 17.5 |        
     393 |         MASTER-SAAO |  P\ |    70 | 17.7 |        


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