TITLE:   GCN CIRCULAR
NUMBER:  36664
SUBJECT: Fermi GRB 240612A: Global MASTER-Net observations report
DATE:    24/06/12 20:45:49 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 GRB 240612A ( Fermi GBM team, GCN 36662) errorbox  8847 sec after notice time and 8878 sec after trigger time at 2024-06-12 14:32:27 UT, with upper limit up to  17.8 mag. Observations started at twilight.  The observations began at zenith distance = 70 deg. The sun  altitude  is -15.7 deg. 

The galactic latitude b = -27 deg., longitude l = 55 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2490981

We obtain a following upper limits.  

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

    8909 | 2024-06-12 14:32:27 |         MASTER-Amur | (21h 00m 29.19s , +08d 49m 16.4s) |   C |    60 | 17.5 |        
    8909 | 2024-06-12 14:32:27 |         MASTER-Amur | (21h 07m 21.39s , +09d 14m 48.4s) |   C |    60 | 13.6 |        
    9096 | 2024-06-12 14:35:34 |         MASTER-Amur | (20h 54m 47.89s , +06d 55m 07.6s) |   C |    60 | 17.6 |        
    9096 | 2024-06-12 14:35:34 |         MASTER-Amur | (21h 01m 34.45s , +07d 20m 09.7s) |   C |    60 | 14.0 |        
    9470 | 2024-06-12 14:41:48 |         MASTER-Amur | (20h 50m 40.50s , +05d 00m 24.4s) |   C |    60 | 17.8 |        
    9470 | 2024-06-12 14:41:48 |         MASTER-Amur | (20h 57m 29.28s , +05d 25m 51.2s) |   C |    60 | 13.5 |        
Filter C is a clear (unfiltred) band. 


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