GCN Circular 36449

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 GRB240512.62 (trigger No 737218721,09h 46m 28.80s , +36d 21m 00.0s, R=5.41) errorbox  154 sec after notice time and 189 sec after trigger time at 2024-05-12 15:01:45 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -21.5 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240512.62 errorbox  4691 sec after notice time and 4726 sec after trigger time at 2024-05-12 16:17:22 UT, with upper limit up to  13.6 mag. The observations began at zenith distance = 51 deg. The sun  altitude  is -20.0 deg. 

The galactic latitude b = 51 deg., longitude l = 188 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2453636

We obtain a following upper limits.  

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

     210 | 2024-05-12 15:01:45 |         MASTER-Amur | (09h 52m 14.31s , +36d 17m 04.2s) |   C |    40 | 17.4 |        
     210 | 2024-05-12 15:01:45 |         MASTER-Amur | (09h 43m 07.38s , +35d 48m 39.2s) |   C |    40 | 15.4 |        
     288 | 2024-05-12 15:02:58 |         MASTER-Amur | (09h 52m 21.30s , +36d 16m 04.9s) |   C |    50 | 17.5 |        
     288 | 2024-05-12 15:02:58 |         MASTER-Amur | (09h 43m 14.69s , +35d 47m 36.9s) |   C |    50 | 15.5 |        
     381 | 2024-05-12 15:04:22 |         MASTER-Amur | (09h 52m 15.32s , +36d 15m 05.4s) |   C |    70 | 17.7 |        
     381 | 2024-05-12 15:04:22 |         MASTER-Amur | (09h 43m 09.11s , +35d 46m 35.4s) |   C |    70 | 15.9 |        
     494 | 2024-05-12 15:06:05 |         MASTER-Amur | (09h 52m 19.62s , +36d 15m 23.1s) |   C |    90 | 17.7 |        
     494 | 2024-05-12 15:06:05 |         MASTER-Amur | (09h 43m 13.62s , +35d 46m 51.8s) |   C |    90 | 15.9 |        
    4767 | 2024-05-12 16:17:22 |        MASTER-Tunka | (09h 46m 20.79s , +36d 47m 08.1s) |   C |    80 | 13.6 |        
Filter C is a clear (unfiltred) band. 


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