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GCN Circular 34686

Subject
Swift GRB230913.70: Global MASTER-Net observations report
Date
2023-09-13T16:53:04Z (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-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 GRB230913.70 (trigger No 1191903,19h 58m 46.70s , +35d 26m 01.0s, R=0.05) errorbox  19 sec after notice time and 102 sec after trigger time at 2023-09-13 16:45:58 UT, with upper limit up to  15.6 mag. Observations started at twilight.  The observations began at zenith distance = 18 deg. The sun  altitude  is -9.3 deg. 

The galactic latitude b =  3 deg., longitude l = 72 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2269973

We obtain a following upper limits.  

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

     113 |      MASTER-Tavrida |   C |    20 | 15.2 |        
     146 |      MASTER-Tavrida |   C |    30 | 15.5 |        
     190 |      MASTER-Tavrida |   C |    10 | 15.1 |        
     201 |      MASTER-Tavrida |   C |    10 | 15.1 |        
     222 |      MASTER-Tavrida |   C |    20 | 15.5 |        
     243 |      MASTER-Tavrida |   C |    20 | 15.5 |        
     265 |      MASTER-Tavrida |   C |    20 | 15.5 |        
     291 |      MASTER-Tavrida |   C |    30 | 15.6 |        
Filter C is a clear (unfiltred) band. 


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