TITLE:   GCN CIRCULAR
NUMBER:  32068
SUBJECT: Swift GRB220519.84: Global MASTER-Net observations report 
DATE:    22/05/19 20:33:08 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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB220519.84 (trigger No 1107209,16h 20m 17.86s , -15d 27m 01.1s, R=0.05) errorbox  16 sec after notice time and 118 sec after trigger time at 2022-05-19 20:12:09 UT, with upper limit up to  15.2 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -23.1 deg. 

The galactic latitude b = 23 deg., longitude l = 360 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1978638

We obtain a following upper limits.  

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

     129 |      MASTER-Tavrida |  P\ |    20 | 14.5 |        
     173 |      MASTER-Tavrida |  P\ |    30 | 14.9 |        
     228 |      MASTER-Tavrida |  P\ |    40 | 14.5 |        
     292 |      MASTER-Tavrida |  P\ |    50 | 12.7 |        
     576 |      MASTER-Tavrida |  P\ |   100 | 15.2 |        
     710 |      MASTER-Tavrida |  P\ |   130 | 15.2 |        


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