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GCN Circular 34609

Subject
Swift GRB230903.72: Global MASTER-Net observations report
Date
2023-09-03T17:36:45Z (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, 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-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 GRB230903.72 (trigger No 1189514,00h 39m 42.24s , -40d 55m 26.4s, R=0.05) errorbox  65 sec after notice time and 100 sec after trigger time at 2023-09-03 17:24:36 UT, with upper limit up to  16.0 mag. Observations started at twilight.  The observations began at zenith distance = 80 deg. The sun  altitude  is -13.8 deg. 

The galactic latitude b = -76 deg., longitude l = 310 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2264930

We obtain a following upper limits.  

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

     110 |         MASTER-SAAO |  P/ |    20 | 14.9 |        
     268 |         MASTER-SAAO |  P/ |    50 | 16.0 |        
     335 |         MASTER-SAAO |  P/ |    60 | 15.8 |        
     426 |         MASTER-SAAO |  P/ |    60 | 15.9 |        
     506 |         MASTER-SAAO |  P/ |    60 | 16.0 |        


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