GCN Circular 36652

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 GRB 240610A ( Fermi GBM team, GCN 36651
Not found
 
 
) errorbox  689 sec after notice time and 723 sec after trigger time at 2024-06-10 00:15:21 UT, with upper limit up to  18.1 mag. The observations began at zenith distance = 43 deg. The sun  altitude  is -66.7 deg. 

The galactic latitude b = -6 deg., longitude l = 47 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2487501

We obtain a following upper limits.  

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

     213 | 2024-06-10 00:06:32 |             MASTER- | (19h 43m 15.79s , +08d 54m 01.7s) |   C |    40 | 18.6 |        
     214 | 2024-06-10 00:06:32 |             MASTER- | (19h 43m 00.89s , +08d 49m 42.1s) |   C |    40 | 18.0 |        
     269 | 2024-06-10 00:07:22 |             MASTER- | (19h 43m 19.00s , +08d 55m 45.2s) |   C |    50 | 18.7 |        
     269 | 2024-06-10 00:07:22 |             MASTER- | (19h 43m 03.99s , +08d 51m 25.0s) |   C |    50 | 18.1 |        
     334 | 2024-06-10 00:08:22 |             MASTER- | (19h 43m 12.86s , +08d 54m 43.5s) |   C |    60 | 18.8 |        
     334 | 2024-06-10 00:08:22 |             MASTER- | (19h 42m 57.77s , +08d 50m 22.8s) |   C |    60 | 18.2 |        
     416 | 2024-06-10 00:09:34 |             MASTER- | (19h 43m 11.76s , +08d 55m 40.6s) |   C |    80 | 18.8 |        
     416 | 2024-06-10 00:09:34 |             MASTER- | (19h 42m 56.61s , +08d 51m 19.5s) |   C |    80 | 18.3 |        
     642 | 2024-06-10 00:13:01 |             MASTER- | (19h 37m 52.55s , +09d 12m 09.0s) |   C |   120 | 18.7 |        
     642 | 2024-06-10 00:13:01 |             MASTER- | (19h 37m 37.17s , +09d 07m 47.9s) |   C |   120 | 18.0 |        
     783 | 2024-06-10 00:15:11 |             MASTER- | (19h 37m 59.72s , +09d 12m 20.0s) |   C |   140 | 18.7 |        
     783 | 2024-06-10 00:15:11 |             MASTER- | (19h 37m 44.23s , +09d 07m 58.2s) |   C |   140 | 18.0 |        
     753 | 2024-06-10 00:15:21 |         MASTER-SAAO | (19h 30m 24.61s , +10d 25m 23.8s) |   C |    60 | 17.2 |        
     832 | 2024-06-10 00:16:41 |         MASTER-SAAO | (19h 38m 23.60s , +10d 24m 16.7s) |   C |    60 | 17.6 |        
     947 | 2024-06-10 00:17:40 |             MASTER- | (19h 37m 55.78s , +09d 13m 52.9s) |   C |   170 | 18.5 |        
     947 | 2024-06-10 00:17:40 |             MASTER- | (19h 37m 40.19s , +09d 09m 30.6s) |   C |   170 | 17.8 |        
    1133 | 2024-06-10 00:20:41 |             MASTER- | (19h 37m 55.80s , +09d 11m 57.0s) |   C |   180 | 18.5 |        
    1133 | 2024-06-10 00:20:41 |             MASTER- | (19h 37m 40.05s , +09d 07m 34.2s) |   C |   180 | 18.0 |        
    1084 | 2024-06-10 00:20:52 |         MASTER-SAAO | (19h 39m 06.51s , +08d 29m 21.7s) |   C |    60 | 17.5 |        
    1163 | 2024-06-10 00:22:11 |         MASTER-SAAO | (19h 47m 04.57s , +08d 30m 50.1s) |   C |    60 | 18.1 |        
    1242 | 2024-06-10 00:23:30 |         MASTER-SAAO | (19h 23m 53.82s , +08d 31m 57.2s) |   C |    60 | 16.9 |        
    1321 | 2024-06-10 00:24:49 |         MASTER-SAAO | (19h 31m 49.07s , +08d 30m 41.9s) |   C |    60 | 17.0 |        
    1717 | 2024-06-10 00:31:26 |         MASTER-SAAO | (19h 30m 31.43s , +10d 25m 37.9s) |   C |    60 | 17.2 |        
    1797 | 2024-06-10 00:32:45 |         MASTER-SAAO | (19h 38m 36.30s , +10d 24m 01.8s) |   C |    60 | 17.6 |        
Filter C is a clear (unfiltred) band. 


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