GCN Circular 37329

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) was pointed to the LAT GRB240828.62 (trigger No 1080646295,15h 01m 58.08s , +36d 38m 27.6s, R=0.300833) errorbox 8021 sec after trigger time at 2024-08-28 17:08:48 UT, with upper limit up to  18.1 mag. Observations started at twilight.  The observations began at zenith distance = 75 deg. The sun  altitude  is -11.1 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the LAT GRB240828.62 errorbox 17444 sec after trigger time at 2024-08-28 19:45:51 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -30.3 deg. 

The galactic latitude b = 61 deg., longitude l = 60 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2579813

We obtain a following upper limits.  

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

    8051 | 2024-08-28 17:08:48 |         MASTER-SAAO | (14h 53m 16.72s , +37d 14m 30.3s) |   C |    60 | 13.4 |        
    8552 | 2024-08-28 17:17:08 |         MASTER-SAAO | (15h 03m 20.23s , +37d 15m 11.4s) |   C |    60 | 17.4 |        
    9476 | 2024-08-28 17:32:33 |         MASTER-SAAO | (14h 53m 14.86s , +37d 15m 50.5s) |   C |    60 | 18.0 |        
    9555 | 2024-08-28 17:33:52 |         MASTER-SAAO | (15h 03m 19.09s , +37d 16m 15.9s) |   C |    60 | 18.1 |        
   10458 | 2024-08-28 17:48:54 |         MASTER-SAAO | (15h 03m 19.97s , +37d 16m 48.7s) |   C |    60 | 18.1 |        
   11211 | 2024-08-28 18:01:28 |         MASTER-SAAO | (15h 00m 13.36s , +35d 22m 55.7s) |   C |    60 | 14.0 |        
   17475 | 2024-08-28 19:45:51 |      MASTER-Tavrida | (14h 53m 21.53s , +36d 03m 58.8s) |   C |    60 | 18.0 |        
   18524 | 2024-08-28 20:03:20 |      MASTER-Tavrida | (14h 53m 24.35s , +36d 04m 05.1s) |   C |    60 | 17.7 |        
   19572 | 2024-08-28 20:20:48 |      MASTER-Tavrida | (14h 53m 27.59s , +36d 03m 37.4s) |   C |    60 | 17.8 |        
   22677 | 2024-08-28 21:12:34 |      MASTER-Tavrida | (14h 55m 41.91s , +37d 23m 27.8s) |   C |    60 | 17.6 |        
   23600 | 2024-08-28 21:27:56 |      MASTER-Tavrida | (14h 55m 41.63s , +37d 22m 39.0s) |   C |    60 | 17.6 |        
   24533 | 2024-08-28 21:43:29 |      MASTER-Tavrida | (14h 55m 46.76s , +37d 23m 38.0s) |   C |    60 | 13.5 |        
Filter C is a clear (unfiltred) band. 


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