GCN Circular 38460

V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

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) started inspect of the Fermi GRB241207.64 (trigger No 755277791,20h 45m 07.20s , -31d 10m 12.0s, R=16.02) errorbox  11094 sec after notice time and 11134 sec after trigger time at 2024-12-07 18:28:40 UT, with upper limit up to  17.9 mag. Observations started at twilight.  The observations began at zenith distance = 50 deg. The sun  altitude  is -10.5 deg. 

The galactic latitude b = -37 deg., longitude l = 13 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2699461

We obtain a following upper limits.  

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

   11165 | 2024-12-07 18:28:40 |         MASTER-SAAO | (20h 50m 39.10s , -38d 51m 36.8s) |   C |    60 | 16.8 |        
   11489 | 2024-12-07 18:34:04 |         MASTER-SAAO | (20h 27m 52.56s , -36d 57m 45.6s) |   C |    60 | 17.1 |        
   11568 | 2024-12-07 18:35:24 |         MASTER-SAAO | (20h 37m 55.53s , -36d 56m 44.8s) |   C |    60 | 17.4 |        
   11647 | 2024-12-07 18:36:43 |         MASTER-SAAO | (20h 17m 13.82s , -35d 02m 19.6s) |   C |    60 | 17.3 |        
   11726 | 2024-12-07 18:38:02 |         MASTER-SAAO | (20h 26m 58.93s , -35d 01m 52.6s) |   C |    60 | 17.4 |        
   11806 | 2024-12-07 18:39:21 |         MASTER-SAAO | (20h 40m 27.88s , -38d 51m 39.5s) |   C |    60 | 17.8 |        
   11885 | 2024-12-07 18:40:41 |         MASTER-SAAO | (20h 50m 38.37s , -38d 53m 13.2s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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