GCN Circular 37717

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 GRB241004.33 (trigger No 749721670,13h 05m 16.08s , -11d 46m 58.8s, R=34.63) errorbox  68180 sec after notice time and 68223 sec after trigger time at 2024-10-05 02:58:08 UT, with upper limit up to  18.3 mag. Observations started at twilight.  The observations began at zenith distance = 71 deg. The sun  altitude  is -16.0 deg. 

The galactic latitude b = 51 deg., longitude l = 309 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2624922

We obtain a following upper limits.  

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

   68253 | 2024-10-05 02:58:08 |         MASTER-SAAO | (10h 50m 53.38s , -27d 10m 29.9s) |   C |    60 | 18.3 |        
   68332 | 2024-10-05 02:59:27 |         MASTER-SAAO | (10h 53m 25.56s , -29d 03m 24.7s) |   C |    60 | 18.1 |        
   68679 | 2024-10-05 03:05:13 |         MASTER-SAAO | (11h 02m 40.86s , -29d 04m 16.8s) |   C |    60 | 17.6 |        
   68759 | 2024-10-05 03:06:34 |         MASTER-SAAO | (11h 38m 23.15s , -32d 51m 26.1s) |   C |    60 | 17.1 |        
   68838 | 2024-10-05 03:07:53 |         MASTER-SAAO | (11h 47m 57.73s , -32d 49m 44.3s) |   C |    60 | 16.9 |        
   68918 | 2024-10-05 03:09:12 |         MASTER-SAAO | (11h 04m 59.50s , -25d 14m 17.7s) |   C |    60 | 17.3 |        
   68998 | 2024-10-05 03:10:33 |         MASTER-SAAO | (11h 13m 56.81s , -25d 15m 07.6s) |   C |    60 | 17.0 |        
   69157 | 2024-10-05 03:13:12 |         MASTER-SAAO | (10h 50m 54.96s , -27d 10m 30.3s) |   C |    60 | 17.1 |        
   69236 | 2024-10-05 03:14:31 |         MASTER-SAAO | (10h 53m 28.11s , -29d 02m 58.4s) |   C |    60 | 16.9 |        
   69315 | 2024-10-05 03:15:50 |         MASTER-SAAO | (11h 10m 56.76s , -29d 02m 26.7s) |   C |    60 | 16.6 |        
   69394 | 2024-10-05 03:17:09 |         MASTER-SAAO | (11h 19m 59.12s , -29d 03m 00.2s) |   C |    60 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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