GCN Circular 36797

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 GRB240630.58 (trigger No 741448122,02h 05m 55.20s , -30d 03m 00.0s, R=2.65) errorbox  34951 sec after notice time and 34985 sec after trigger time at 2024-06-30 23:31:42 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -75.9 deg. 

The galactic latitude b = -73 deg., longitude l = 227 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2514130

We obtain a following upper limits.  

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

   35015 | 2024-06-30 23:31:42 |         MASTER-SAAO | (01h 58m 25.32s , -33d 04m 44.5s) |   C |    60 | 13.8 |        
   35094 | 2024-06-30 23:33:01 |         MASTER-SAAO | (02h 07m 58.42s , -33d 06m 10.6s) |   C |    60 | 13.4 |        
   36161 | 2024-06-30 23:50:48 |         MASTER-SAAO | (01h 58m 25.83s , -33d 06m 20.0s) |   C |    60 | 18.4 |        
   36240 | 2024-06-30 23:52:07 |         MASTER-SAAO | (02h 08m 02.40s , -33d 04m 38.4s) |   C |    60 | 18.4 |        
   36636 | 2024-06-30 23:58:43 |         MASTER-SAAO | (01h 51m 34.96s , -27d 23m 20.3s) |   C |    60 | 18.4 |        
   36716 | 2024-07-01 00:00:02 |         MASTER-SAAO | (02h 00m 35.97s , -27d 24m 37.1s) |   C |    60 | 18.7 |        
   36956 | 2024-07-01 00:04:03 |         MASTER-SAAO | (01h 47m 31.75s , -31d 12m 03.4s) |   C |    60 | 18.6 |        
   37115 | 2024-07-01 00:06:41 |         MASTER-SAAO | (01h 58m 28.33s , -33d 06m 37.0s) |   C |    60 | 18.4 |        
   37194 | 2024-07-01 00:08:01 |         MASTER-SAAO | (02h 07m 58.99s , -33d 04m 31.5s) |   C |    60 | 18.5 |        
   37591 | 2024-07-01 00:14:37 |         MASTER-SAAO | (01h 51m 37.40s , -27d 24m 08.0s) |   C |    60 | 18.4 |        
   37670 | 2024-07-01 00:15:57 |         MASTER-SAAO | (02h 00m 33.34s , -27d 24m 53.2s) |   C |    60 | 18.7 |        
   37909 | 2024-07-01 00:19:55 |         MASTER-SAAO | (01h 47m 28.28s , -31d 12m 48.6s) |   C |    60 | 18.7 |        
   38146 | 2024-07-01 00:23:53 |         MASTER-SAAO | (01h 45m 24.43s , -29d 18m 25.6s) |   C |    60 | 19.0 |        
Filter C is a clear (unfiltred) band. 


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