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GCN Circular 34563

Subject
Swift GRB230826.81: Global MASTER-Net observations report
Date
2023-08-26T19:40:43Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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 GRB230826.81 (trigger No 1187463,05h 32m 02.88s , +66d 07m 30.0s, R=0.05) errorbox  23 sec after notice time and 45 sec after trigger time at 2023-08-26 19:33:32 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -28.0 deg. 

The galactic latitude b = 18 deg., longitude l = 147 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2260933

We obtain a following upper limits.  

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

      50 |      MASTER-Tavrida |   C |    10 | 17.0 |        
      67 |      MASTER-Tavrida |   C |    10 | 16.9 |        
      89 |      MASTER-Tavrida |   C |    20 | 17.3 |        
     117 |      MASTER-Tavrida |   C |    20 | 17.3 |        
     149 |      MASTER-Tavrida |   C |    30 | 17.6 |        
     186 |      MASTER-Tavrida |   C |    30 | 17.5 |        
     229 |      MASTER-Tavrida |   C |    40 | 17.7 |        
     282 |      MASTER-Tavrida |   C |    50 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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