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GCN Circular 34506

Subject
Swift GRB230820.80: Global MASTER-Net observations report
Date
2023-08-21T09:28:36Z (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-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 Swift GRB230820.80 (trigger No 1186291,05h 37m 16.99s , +22d 59m 15.4s, R=0.05) errorbox  49381 sec after notice time and 49607 sec after trigger time at 2023-08-21 08:56:23 UT, with upper limit up to  15.3 mag. The observations began at zenith distance = 72 deg. The sun  altitude  is -28.0 deg. 

The galactic latitude b = -4 deg., longitude l = 184 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2257030

We obtain a following upper limits.  

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

   49698 |         MASTER-OAFA |   C |   180 | 13.5 |        
   49698 |         MASTER-OAFA |   C |   180 | 13.5 |        
   50102 |         MASTER-OAFA |   C |   180 | 12.4 |        
   50102 |         MASTER-OAFA |   C |   180 | 12.4 |        
   50501 |         MASTER-OAFA |   C |   180 | 14.6 |        
   50501 |         MASTER-OAFA |   C |   180 | 14.6 |        
   50701 |         MASTER-OAFA |   C |   180 | 14.7 |        
   50701 |         MASTER-OAFA |   C |   180 | 14.7 |        
   50924 |         MASTER-OAFA |   C |   180 | 15.3 |        
   50924 |         MASTER-OAFA |   C |   180 | 15.3 |        
Filter C is a clear (unfiltred) band. 


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