GCN Circular 36487

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 MAXI GRB240514.78 (trigger No 44849999,05h 06m 24.00s , -21d 18m 00.0s, R=1) errorbox  25608 sec after notice time and 79384 sec after trigger time at 2024-05-15 16:43:41 UT, with upper limit up to  18.2 mag. Observations started at twilight.  The observations began at zenith distance = 62 deg. The sun  altitude  is -11.7 deg. 

The galactic latitude b = -32 deg., longitude l = 222 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2457959

We obtain a following upper limits.  

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

   79474 | 2024-05-15 16:43:41 |         MASTER-SAAO | (05h 03m 45.59s , -21d 10m 22.4s) |   C |   180 | 17.3 |        
   79614 | 2024-05-15 16:47:00 |         MASTER-SAAO | (05h 03m 42.81s , -21d 28m 13.3s) |   C |    60 | 17.6 |        
   79614 | 2024-05-15 16:47:00 |         MASTER-SAAO | (05h 05m 38.84s , -21d 40m 48.0s) |   C |    60 | 17.4 |        
   79693 | 2024-05-15 16:48:20 |         MASTER-SAAO | (05h 12m 13.17s , -21d 29m 07.8s) |   C |    60 | 17.7 |        
   79693 | 2024-05-15 16:48:20 |         MASTER-SAAO | (05h 14m 09.38s , -21d 41m 42.5s) |   C |    60 | 17.5 |        
   80396 | 2024-05-15 16:59:03 |         MASTER-SAAO | (05h 03m 48.28s , -21d 09m 48.8s) |   C |   180 | 18.2 |        
   80396 | 2024-05-15 16:59:03 |         MASTER-SAAO | (05h 05m 43.90s , -21d 22m 24.3s) |   C |   180 | 18.2 |        
   80536 | 2024-05-15 17:02:22 |         MASTER-SAAO | (05h 03m 43.29s , -21d 29m 25.9s) |   C |    60 | 18.0 |        
   80536 | 2024-05-15 17:02:22 |         MASTER-SAAO | (05h 05m 39.09s , -21d 42m 01.8s) |   C |    60 | 18.1 |        
   80616 | 2024-05-15 17:03:42 |         MASTER-SAAO | (05h 12m 20.95s , -21d 27m 35.7s) |   C |    60 | 18.1 |        
   80616 | 2024-05-15 17:03:42 |         MASTER-SAAO | (05h 14m 16.86s , -21d 40m 11.9s) |   C |    60 | 18.1 |        
   80755 | 2024-05-15 17:05:02 |         MASTER-SAAO | (05h 03m 47.11s , -21d 10m 31.0s) |   C |   180 | 17.9 |        
   80755 | 2024-05-15 17:05:02 |         MASTER-SAAO | (05h 05m 42.56s , -21d 23m 07.6s) |   C |   180 | 17.9 |        
   80895 | 2024-05-15 17:08:21 |         MASTER-SAAO | (05h 00m 03.48s , -19d 34m 25.3s) |   C |    60 | 17.6 |        
   80895 | 2024-05-15 17:08:21 |         MASTER-SAAO | (05h 01m 57.53s , -19d 47m 02.2s) |   C |    60 | 17.8 |        
   80975 | 2024-05-15 17:09:41 |         MASTER-SAAO | (05h 08m 24.36s , -19d 35m 21.2s) |   C |    60 | 17.8 |        
   80975 | 2024-05-15 17:09:41 |         MASTER-SAAO | (05h 10m 18.55s , -19d 47m 57.9s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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