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GCN Circular 35379

Subject
Swift GRB231216.77: Global MASTER-Net observations report
Date
2023-12-16T18:57:11Z (7 months 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 GRB231216.77 (trigger No 1202749,02h 39m 02.16s , +33d 35m 45.6s, R=0.05) errorbox  47 sec after notice time and 382 sec after trigger time at 2023-12-16 18:42:04 UT, with upper limit up to  17.6 mag. Observations started at twilight.  The observations began at zenith distance = 66 deg. The sun  altitude  is -11.7 deg. 

The galactic latitude b = -24 deg., longitude l = 148 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2334628

We obtain a following upper limits.  

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

     413 |         MASTER-SAAO | P\\ |    60 | 15.6 |        
     473 |         MASTER-SAAO | P\\ |   180 | 16.2 |  Coadd 
     413 |         MASTER-SAAO |  P/ |    60 | 16.8 |        
     492 |         MASTER-SAAO | P\\ |    60 | 15.8 |        
     492 |         MASTER-SAAO |  P/ |    60 | 16.9 |        
     572 |         MASTER-SAAO | P\\ |    60 | 16.1 |        
     572 |         MASTER-SAAO |  P/ |    60 | 17.1 |        
     661 |         MASTER-SAAO | P\\ |    60 | 16.2 |        
     661 |         MASTER-SAAO |  P/ |    60 | 17.2 |        
     741 |         MASTER-SAAO | P\\ |    60 | 16.4 |        
     741 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
     832 |         MASTER-SAAO | P\\ |    60 | 16.5 |        
     832 |         MASTER-SAAO |  P/ |    60 | 17.5 |        
     911 |         MASTER-SAAO | P\\ |    60 | 16.5 |        
     911 |         MASTER-SAAO |  P/ |    60 | 17.5 |        
    1000 |         MASTER-SAAO | P\\ |    60 | 16.4 |        
    1000 |         MASTER-SAAO |  P/ |    60 | 17.6 |        
    1080 |         MASTER-SAAO | P\\ |    60 | 16.6 |        


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