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GCN Circular 34111

Swift GRB230628.93: Global MASTER-Net observations report
2023-06-28T23:52:49Z (a year ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
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-OAFA robotic telescope  (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB230628.93 (trigger No 1177054,11h 27m 21.84s , -11d 26m 49.2s, R=0.05) errorbox  4426 sec after notice time and 4457 sec after trigger time at 2023-06-28 23:40:27 UT, with upper limit up to  18.1 mag. The observations began at zenith distance = 35 deg. The sun  altitude  is -24.6 deg. 

The galactic latitude b = 46 deg., longitude l = 273 deg.

Real time updated cover map and OT discovered available here:

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment

    4487 |         MASTER-OAFA |   C |    60 | 18.0 |        
    4579 |         MASTER-OAFA |   C |    60 | 18.1 |        
    4672 |         MASTER-OAFA |   C |    60 | 18.1 |        
    4764 |         MASTER-OAFA |   C |    60 | 18.0 |        
Filter C is a clear (unfiltred) band. 

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

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