TITLE:   GCN CIRCULAR
NUMBER:  26586
SUBJECT: Swift trigger 946234/GRB 191226.02 : MASTER obervation
DATE:    19/12/26 00:53:13 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,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, A.Chasovnikov,
K.Zhirkov, A.Pozdnyakov, F.Balakin, T.Pogrosheva,D.Kuvshinov(Lomonosov MoscowState University, SAI, Physics Department),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley(South African Astronomical Observatory),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
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, D.Kobtsev (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  GRB191226.02 15 sec after notice 
time and 105 sec after trigger time at 2019-12-26 00:32:51 UT. On our 
first (20s exposure)  set we haven`t found optical transient  within Swift 
error-box (ra=17.1375 dec=-57.0847 r=0.05).
The 5-sigma upper limit has been about  16.0mag

Error-box Altitude: 62.54 
Sun: Altitude: -9.52
Observation and reduction will be continued

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