GCN Circular 36975

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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240729.57 (trigger No 743953682,19h 23m 02.40s , +44d 43m 12.0s, R=2.24) errorbox  16856 sec after notice time and 16877 sec after trigger time at 2024-07-29 18:29:15 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 22 deg. The sun  altitude  is -12.5 deg. 

The galactic latitude b = 13 deg., longitude l = 77 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2544789

We obtain a following upper limits.  

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

   16908 | 2024-07-29 18:29:15 |      MASTER-Tavrida | (19h 21m 40.27s , +45d 15m 50.1s) |   C |    60 | 16.8 |        
   16981 | 2024-07-29 18:30:28 |      MASTER-Tavrida | (19h 24m 54.96s , +43d 56m 46.3s) |   C |    60 | 17.5 |        
   17055 | 2024-07-29 18:31:42 |      MASTER-Tavrida | (19h 10m 25.87s , +43d 56m 43.4s) |   C |    60 | 18.5 |        
   17129 | 2024-07-29 18:32:56 |      MASTER-Tavrida | (19h 18m 47.48s , +46d 33m 20.8s) |   C |    60 | 18.4 |        
   17203 | 2024-07-29 18:34:10 |      MASTER-Tavrida | (19h 06m 55.85s , +45d 15m 17.9s) |   C |    60 | 18.3 |        
   17277 | 2024-07-29 18:35:24 |      MASTER-Tavrida | (19h 14m 27.88s , +42d 38m 28.0s) |   C |    60 | 17.1 |        
   17351 | 2024-07-29 18:36:38 |      MASTER-Tavrida | (19h 28m 32.33s , +42d 38m 31.2s) |   C |    60 | 17.6 |        
   17425 | 2024-07-29 18:37:52 |      MASTER-Tavrida | (19h 16m 30.77s , +47d 50m 56.2s) |   C |    60 | 17.4 |        
   17499 | 2024-07-29 18:39:06 |      MASTER-Tavrida | (19h 03m 49.04s , +46d 32m 53.7s) |   C |    60 | 18.3 |        
   17574 | 2024-07-29 18:40:21 |      MASTER-Tavrida | (19h 36m 24.62s , +45d 14m 20.4s) |   C |    60 | 17.4 |        
   17647 | 2024-07-29 18:41:34 |      MASTER-Tavrida | (19h 33m 56.79s , +46d 32m 00.4s) |   C |    60 | 17.4 |        
   17722 | 2024-07-29 18:42:49 |      MASTER-Tavrida | (19h 18m 47.26s , +41d 21m 12.9s) |   C |    60 | 17.1 |        
   17796 | 2024-07-29 18:44:03 |      MASTER-Tavrida | (19h 39m 20.17s , +43d 57m 04.4s) |   C |    60 | 17.5 |        
   17872 | 2024-07-29 18:45:19 |      MASTER-Tavrida | (19h 21m 34.19s , +45d 13m 47.2s) |   C |    60 | 16.9 |        
   17946 | 2024-07-29 18:46:33 |      MASTER-Tavrida | (19h 33m 01.26s , +45d 14m 04.2s) |   C |    60 | 17.8 |        
   18018 | 2024-07-29 18:47:45 |      MASTER-Tavrida | (19h 24m 50.81s , +43d 57m 48.1s) |   C |    60 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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