TITLE:   GCN CIRCULAR
NUMBER:  36708
SUBJECT: Fermi GRB 240619A: Global MASTER-Net observations report
DATE:    24/06/19 23:45:42 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 240619A ( Fermi GBM team, GCN 36694) errorbox  55438 sec after notice time and 55481 sec after trigger time at 2024-06-19 19:08:12 UT, with upper limit up to  16.7 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -17.7 deg. 

The galactic latitude b = 60 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=2499301

We obtain a following upper limits.  

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

   55512 | 2024-06-19 19:08:12 |   MASTER-Kislovodsk | (10h 49m 58.96s , +16d 22m 16.8s) |   C |    60 | 16.7 |        
   57629 | 2024-06-19 19:43:30 |   MASTER-Kislovodsk | (10h 43m 55.90s , +14d 27m 58.5s) |   C |    60 | 16.3 |        
   57710 | 2024-06-19 19:44:50 |   MASTER-Kislovodsk | (10h 44m 03.04s , +14d 26m 52.8s) |   C |    60 | 16.1 |        
   58111 | 2024-06-19 19:51:32 |   MASTER-Kislovodsk | (10h 49m 57.47s , +16d 21m 38.9s) |   C |    60 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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