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GCN Circular 34897

Subject
Swift GRB 231028A: Global MASTER-Net observations report
Date
2023-10-28T22:40:30Z (a year 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, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 231028A ( M. A. Williams et al., GCN 34894Loading...
 
 ) errorbox  39827 sec after notice time and 39846 sec after trigger time at 2023-10-28 15:13:16 UT, with upper limit up to  14.5 mag. Observations started at twilight.  The observations began at zenith distance = 78 deg. The sun  altitude  is -12.3 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 231028A errorbox  65649 sec after notice time and 65669 sec after trigger time at 2023-10-28 22:23:38 UT, with upper limit up to  16.0 mag. Observations started at twilight.  The observations began at zenith distance = 79 deg. The sun  altitude  is -14.4 deg. 

The galactic latitude b = 69 deg., longitude l = 20 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2291906

We obtain a following upper limits.  

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

   39937 |   MASTER-Kislovodsk |   C |   180 | 13.6 |        
   40139 |   MASTER-Kislovodsk |   C |   180 | 13.0 |        
   40340 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
   41732 |   MASTER-Kislovodsk |   C |   180 | 13.0 |        
   65699 |        MASTER-Tunka |   C |    60 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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