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GCN Circular 33458

Subject
Swift GRB230311.84: Global MASTER-Net observations report
Date
2023-03-11T20:16:24Z (2 years ago)
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-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 GRB230311.84 (trigger No 1159439,05h 34m 03.41s , +22d 14m 11.4s, R=0.05) errorbox  105 sec after notice time and 188 sec after trigger time at 2023-03-11 20:11:17 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 72 deg. The sun  altitude  is -38.3 deg. 

The galactic latitude b = -5 deg., longitude l = 185 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203810

We obtain a following upper limits.  

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

     209 |         MASTER-SAAO | P\\ |    40 | 16.4 |        
     209 |         MASTER-SAAO |  P/ |    40 | 16.7 |        
     275 |         MASTER-SAAO | P\\ |    50 | 16.1 |        
     275 |         MASTER-SAAO |  P/ |    50 | 16.4 |        
     341 |         MASTER-SAAO | P\\ |    60 | 16.5 |        
     341 |         MASTER-SAAO |  P/ |    60 | 16.8 |        


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