GCN Circular 37709

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 GRB241003.28 (trigger No 749630753,12h 54m 55.92s , -17d 52m 58.8s, R=35.73) errorbox  72996 sec after notice time and 73030 sec after trigger time at 2024-10-04 03:02:59 UT, with upper limit up to  17.8 mag. Observations started at twilight.  The observations began at zenith distance = 74 deg. The sun  altitude  is -15.3 deg. 

The galactic latitude b = 45 deg., longitude l = 305 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2623594

We obtain a following upper limits.  

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

   73060 | 2024-10-04 03:02:59 |         MASTER-SAAO | (10h 54m 57.54s , -23d 21m 28.5s) |   C |    60 | 17.8 |        
   73139 | 2024-10-04 03:04:18 |         MASTER-SAAO | (11h 03m 40.47s , -23d 20m 13.7s) |   C |    60 | 17.8 |        
   73219 | 2024-10-04 03:05:37 |         MASTER-SAAO | (11h 10m 48.02s , -29d 03m 56.1s) |   C |    60 | 17.7 |        
   73298 | 2024-10-04 03:06:56 |         MASTER-SAAO | (11h 20m 05.02s , -29d 03m 37.3s) |   C |    60 | 17.4 |        
   73378 | 2024-10-04 03:08:16 |         MASTER-SAAO | (10h 46m 00.47s , -21d 28m 18.3s) |   C |    60 | 17.8 |        
   73457 | 2024-10-04 03:09:35 |         MASTER-SAAO | (10h 54m 39.05s , -21d 26m 37.5s) |   C |    60 | 17.6 |        
   73616 | 2024-10-04 03:12:14 |         MASTER-SAAO | (10h 39m 27.71s , -02d 28m 18.0s) |   C |    60 | 16.2 |        
   73869 | 2024-10-04 03:16:27 |         MASTER-SAAO | (10h 34m 33.27s , -13d 52m 49.9s) |   C |    60 | 16.6 |        
   73948 | 2024-10-04 03:17:46 |         MASTER-SAAO | (10h 42m 51.29s , -13d 51m 29.8s) |   C |    60 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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