TITLE:   GCN CIRCULAR
NUMBER:  35312
SUBJECT: Swift GRB231210.90: Global MASTER-Net observations report
DATE:    23/12/10 21:38:56 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 GRB231210.90 (trigger No 1201696,06h 23m 05.28s , -48d 21m 32.4s, R=0.05) errorbox  89 sec after notice time and 124 sec after trigger time at 2023-12-10 21:31:08 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 30 deg. The sun  altitude  is -33.2 deg. 

The galactic latitude b = -24 deg., longitude l = 257 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2329146

We obtain a following upper limits.  

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

     129 |         MASTER-SAAO | P\\ |    10 | 17.4 |        
     129 |         MASTER-SAAO |  P/ |    10 | 17.3 |        
     213 |         MASTER-SAAO | P\\ |    40 | 18.5 |        
     213 |         MASTER-SAAO |  P/ |    40 | 18.4 |        
     283 |         MASTER-SAAO | P\\ |    50 | 18.9 |        
     283 |         MASTER-SAAO |  P/ |    50 | 18.9 |        


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