[vsnet-grb-info 24501] Swift GRB191228.00: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26600
SUBJECT: Swift GRB191228.00: Global MASTER-Net observations report 
DATE:    19/12/28 00:10:10 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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) was pointed to the Swift GRB191228.00 (trigger No 946476,00h 21m 21.36s , -08d 40m 12.0s, R=0.05) errorbox  146 sec after trigger time at 2019-12-28 00:03:46 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 82 deg. The sun  altitude  is -75.7 deg. 

The galactic latitude b = -70 deg., longitude l = 102 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1241866

We obtain a following upper limits.  

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

     157 |          MASTER-IAC |  P| |    20 | 16.9 |        
     208 |          MASTER-IAC |  P| |    40 | 17.3 |        
     265 |          MASTER-IAC |  P| |    50 | 17.3 |        


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