GCN Circular 35674

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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240205.14 (trigger No 728796365,21h 04m 19.92s , +03d 49m 58.8s, R=28.77) errorbox  27489 sec after notice time and 27525 sec after trigger time at 2024-02-05 11:04:45 UT, with upper limit up to  19.0 mag. Observations started at twilight.  The observations began at zenith distance = 58 deg. The sun  altitude  is -10.0 deg. 

The galactic latitude b = -28 deg., longitude l = 54 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2371514

We obtain a following upper limits.  

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

   27556 | 2024-02-05 11:04:45 |        MASTER-Tunka | (22h 23m 08.78s , +24d 05m 20.4s) |   C |    60 | 16.2 |  Coadd 
   27649 | 2024-02-05 11:06:18 |        MASTER-Tunka | (22h 31m 48.61s , +24d 04m 20.8s) |   C |    60 | 16.8 |  Coadd 
   29249 | 2024-02-05 11:32:59 |        MASTER-Tunka | (22h 23m 06.11s , +24d 04m 07.6s) |   C |    60 | 16.4 |  Coadd 
   29364 | 2024-02-05 11:34:54 |        MASTER-Tunka | (22h 31m 48.75s , +24d 05m 27.6s) |   C |    60 | 16.3 |  Coadd 
   29991 | 2024-02-05 11:45:21 |        MASTER-Tunka | (22h 23m 04.25s , +24d 04m 56.4s) |   C |    60 | 18.8 |        
   30064 | 2024-02-05 11:46:34 |        MASTER-Tunka | (22h 35m 53.68s , +20d 17m 32.7s) |   C |    60 | 18.9 |        
   30136 | 2024-02-05 11:47:45 |        MASTER-Tunka | (22h 44m 30.98s , +20d 16m 37.7s) |   C |    60 | 19.0 |        
   30208 | 2024-02-05 11:48:58 |        MASTER-Tunka | (22h 31m 44.67s , +24d 03m 21.1s) |   C |    60 | 19.0 |        
   30280 | 2024-02-05 11:50:10 |        MASTER-Tunka | (22h 37m 02.02s , +22d 11m 20.5s) |   C |    60 | 19.0 |        
   30352 | 2024-02-05 11:51:21 |        MASTER-Tunka | (22h 45m 40.05s , +22d 09m 39.5s) |   C |    60 | 19.0 |        
   31175 | 2024-02-05 12:05:04 |        MASTER-Tunka | (22h 35m 59.82s , +20d 15m 59.6s) |   C |    60 | 18.9 |        
   31247 | 2024-02-05 12:06:17 |        MASTER-Tunka | (22h 44m 24.73s , +20d 15m 06.5s) |   C |    60 | 18.9 |        
   31320 | 2024-02-05 12:07:30 |        MASTER-Tunka | (22h 37m 03.08s , +22d 09m 18.3s) |   C |    60 | 19.0 |        
   31391 | 2024-02-05 12:08:41 |        MASTER-Tunka | (22h 45m 38.78s , +22d 10m 40.6s) |   C |    60 | 18.9 |        
   32208 | 2024-02-05 12:22:18 |        MASTER-Tunka | (22h 35m 51.84s , +20d 14m 24.7s) |   C |    60 | 18.6 |        
   32279 | 2024-02-05 12:23:28 |        MASTER-Tunka | (22h 44m 30.15s , +20d 14m 49.5s) |   C |    60 | 18.8 |        
   32350 | 2024-02-05 12:24:40 |        MASTER-Tunka | (22h 37m 00.34s , +22d 10m 12.8s) |   C |    60 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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