GCN Circular 36791

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) started inspect of the Fermi GRB240629.52 (trigger No 741356809,01h 42m 28.80s , -29d 16m 48.0s, R=5.63) errorbox  37803 sec after notice time and 37829 sec after trigger time at 2024-06-29 22:57:13 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 79 deg. The sun  altitude  is -80.6 deg. 

The galactic latitude b = -78 deg., longitude l = 225 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2512447

We obtain a following upper limits.  

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

   37859 | 2024-06-29 22:57:13 |         MASTER-SAAO | (01h 22m 11.07s , -33d 07m 03.2s) |   C |    60 | 18.9 |        
   38131 | 2024-06-29 23:01:45 |         MASTER-SAAO | (01h 20m 25.56s , -31d 11m 15.3s) |   C |    60 | 18.9 |        
   38869 | 2024-06-29 23:14:03 |         MASTER-SAAO | (01h 22m 16.91s , -33d 06m 45.3s) |   C |    60 | 15.3 |        
   38948 | 2024-06-29 23:15:22 |         MASTER-SAAO | (01h 31m 47.42s , -33d 05m 15.2s) |   C |    60 | 16.7 |        
   39202 | 2024-06-29 23:19:36 |         MASTER-SAAO | (01h 20m 24.99s , -31d 12m 23.6s) |   C |    60 | 17.3 |        
   39281 | 2024-06-29 23:20:55 |         MASTER-SAAO | (01h 29m 48.10s , -31d 11m 09.0s) |   C |    60 | 15.6 |        
Filter C is a clear (unfiltred) band. 


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