GCN Circular 35321

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 IceCube Alert 231211.03 (trigger No 4054005,20h 50m 27.12s , +10d 03m 10.8s, R=0.51) errorbox  49886 sec after notice time and 49930 sec after trigger time at 2023-12-11 14:39:42 UT, with upper limit up to  16.8 mag. Observations started at twilight.  The observations began at zenith distance = 41 deg. The sun  altitude  is -11.3 deg. 

The galactic latitude b = -21 deg., longitude l = 57 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2329233

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   50021 | 2023-12-11 14:39:42 |   MASTER-Kislovodsk | (20h 50m 45.88s , +10d 30m 00.6s) |   C |   180 | 16.8 |        
   50162 | 2023-12-11 14:43:03 |   MASTER-Kislovodsk | (20h 49m 14.40s , +11d 07m 58.1s) |   C |    60 | 16.2 |        
   50242 | 2023-12-11 14:44:24 |   MASTER-Kislovodsk | (20h 57m 18.96s , +11d 09m 47.1s) |   C |    60 | 16.1 |        
   51196 | 2023-12-11 14:59:17 |   MASTER-Kislovodsk | (20h 50m 45.01s , +10d 29m 41.5s) |   C |   180 | 16.4 |        
Filter C is a clear (unfiltred) band. 


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