TITLE:   GCN CIRCULAR
NUMBER:  36783
SUBJECT: Fermi  trigger No 741296200: Global MASTER-Net observations report
DATE:    24/06/28 20:30:56 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-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 Fermi GRB240628.82 (trigger No 741296200,13h 14m 40.80s , -30d 18m 00.0s, R=17.72) errorbox  363 sec after notice time and 373 sec after trigger time at 2024-06-28 19:42:49 UT, with upper limit up to  16.1 mag. The observations began at zenith distance = 20 deg. The sun  altitude  is -49.7 deg. 

The galactic latitude b = 32 deg., longitude l = 310 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2511627

We obtain a following upper limits.  

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

     404 | 2024-06-28 19:42:49 |         MASTER-SAAO | (13h 57m 45.42s , -33d 02m 45.7s) |   C |    60 | 14.1 |        
     562 | 2024-06-28 19:45:27 |         MASTER-SAAO | (13h 58m 18.79s , -31d 09m 31.1s) |   C |    60 | 16.1 |        
    1040 | 2024-06-28 19:53:25 |         MASTER-SAAO | (13h 40m 30.89s , -31d 07m 22.1s) |   C |    60 | 15.0 |        
Filter C is a clear (unfiltred) band. 


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