GCN Circular 37027

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 GRB240804.43 (trigger No 744459130,05h 39m 36.00s , -64d 12m 36.0s, R=1.49) errorbox  24113 sec after notice time and 24146 sec after trigger time at 2024-08-04 16:54:32 UT, with upper limit up to  16.2 mag. Observations started at twilight.  The observations began at zenith distance = 80 deg. The sun  altitude  is -11.0 deg. 

The galactic latitude b = -32 deg., longitude l = 274 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2550672

We obtain a following upper limits.  

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

   24176 | 2024-08-04 16:54:32 |         MASTER-SAAO | (05h 43m 53.65s , -63d 07m 38.2s) |   C |    60 | 16.1 |        
   24256 | 2024-08-04 16:55:51 |         MASTER-SAAO | (05h 13m 15.37s , -65d 05m 03.7s) |   C |    60 | 16.2 |        
   24335 | 2024-08-04 16:57:10 |         MASTER-SAAO | (05h 32m 26.10s , -65d 04m 09.4s) |   C |    60 | 15.7 |        
   24414 | 2024-08-04 16:58:30 |         MASTER-SAAO | (05h 49m 37.83s , -65d 01m 43.4s) |   C |    60 | 15.2 |        
Filter C is a clear (unfiltred) band. 


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