GCN Circular 36447

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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB240512.04 (trigger No 737168073,12h 15m 12.00s , +76d 48m 00.0s, R=1) errorbox  41637 sec after notice time and 41672 sec after trigger time at 2024-05-12 12:29:01 UT, with upper limit up to  18.1 mag. Observations started at twilight.  The observations began at zenith distance = 27 deg. The sun  altitude  is -11.3 deg. 

The galactic latitude b = 40 deg., longitude l = 126 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2452842

We obtain a following upper limits.  

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

   41703 | 2024-05-12 12:29:01 |         MASTER-Amur | (12h 09m 28.49s , +76d 52m 41.5s) |   C |    60 | 17.1 |        
   41703 | 2024-05-12 12:29:01 |         MASTER-Amur | (12h 43m 22.48s , +77d 17m 09.6s) |   C |    60 | 14.2 |        
   41796 | 2024-05-12 12:30:34 |         MASTER-Amur | (12h 16m 06.90s , +75d 14m 28.3s) |   C |    60 | 17.4 |        
   41796 | 2024-05-12 12:30:34 |         MASTER-Amur | (11h 47m 45.36s , +74d 48m 28.4s) |   C |    60 | 14.2 |        
   41889 | 2024-05-12 12:32:07 |         MASTER-Amur | (12h 26m 26.75s , +79d 03m 43.0s) |   C |    60 | 17.4 |        
   41889 | 2024-05-12 12:32:07 |         MASTER-Amur | (11h 48m 40.54s , +78d 37m 29.7s) |   C |    60 | 15.0 |        
   41983 | 2024-05-12 12:33:41 |         MASTER-Amur | (11h 46m 13.98s , +77d 06m 46.0s) |   C |    60 | 17.6 |        
   42076 | 2024-05-12 12:35:14 |         MASTER-Amur | (12h 36m 47.49s , +75d 01m 47.1s) |   C |    60 | 17.5 |        
   42262 | 2024-05-12 12:38:20 |         MASTER-Amur | (12h 53m 29.87s , +78d 50m 50.0s) |   C |    60 | 17.5 |        
   42636 | 2024-05-12 12:44:33 |         MASTER-Amur | (12h 09m 38.45s , +76d 53m 36.3s) |   C |    60 | 17.8 |        
   42636 | 2024-05-12 12:44:34 |         MASTER-Amur | (12h 43m 37.80s , +77d 18m 52.8s) |   C |    60 | 15.4 |        
   42731 | 2024-05-12 12:46:09 |         MASTER-Amur | (12h 16m 13.29s , +75d 13m 21.3s) |   C |    60 | 17.9 |        
   42731 | 2024-05-12 12:46:09 |         MASTER-Amur | (11h 47m 54.48s , +74d 47m 06.2s) |   C |    60 | 14.9 |        
   42824 | 2024-05-12 12:47:42 |         MASTER-Amur | (12h 26m 41.24s , +79d 02m 35.7s) |   C |    60 | 17.8 |        
   42824 | 2024-05-12 12:47:42 |         MASTER-Amur | (11h 48m 59.72s , +78d 36m 04.2s) |   C |    60 | 15.6 |        
   42916 | 2024-05-12 12:49:14 |         MASTER-Amur | (11h 46m 26.66s , +77d 06m 40.4s) |   C |    60 | 17.7 |        
   43076 | 2024-05-12 12:51:54 |         MASTER-Amur | (12h 36m 49.87s , +75d 00m 57.6s) |   C |    60 | 17.9 |        
   43262 | 2024-05-12 12:55:00 |         MASTER-Amur | (12h 53m 42.34s , +78d 47m 35.9s) |   C |    60 | 16.1 |        
   43640 | 2024-05-12 13:01:18 |         MASTER-Amur | (12h 54m 24.07s , +77d 09m 52.0s) |   C |    60 | 16.5 |        
   43640 | 2024-05-12 13:01:18 |         MASTER-Amur | (12h 21m 59.00s , +76d 43m 35.0s) |   C |    60 | 13.8 |        
   43733 | 2024-05-12 13:02:51 |         MASTER-Amur | (12h 16m 24.18s , +75d 13m 35.4s) |   C |    60 | 17.1 |        
   43733 | 2024-05-12 13:02:51 |         MASTER-Amur | (11h 48m 04.75s , +74d 47m 28.2s) |   C |    60 | 14.9 |        
   43826 | 2024-05-12 13:04:24 |         MASTER-Amur | (12h 26m 51.92s , +79d 02m 11.0s) |   C |    60 | 17.5 |        
   43826 | 2024-05-12 13:04:24 |         MASTER-Amur | (11h 49m 10.64s , +78d 35m 42.3s) |   C |    60 | 15.6 |        
   43920 | 2024-05-12 13:05:58 |         MASTER-Amur | (11h 46m 49.60s , +77d 06m 06.2s) |   C |    60 | 18.1 |        
   44013 | 2024-05-12 13:07:31 |         MASTER-Amur | (12h 37m 01.52s , +74d 58m 02.4s) |   C |    60 | 18.0 |        
   44201 | 2024-05-12 13:10:38 |         MASTER-Amur | (12h 53m 51.58s , +78d 48m 36.7s) |   C |    60 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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