TITLE:   GCN CIRCULAR
NUMBER:  36925
SUBJECT: Fermi  trigger No 743315411: Global MASTER-Net observations report
DATE:    24/07/23 10:31:03 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 GRB240722.19 (trigger No 743315411,09h 09m 36.00s , +13d 09m 00.0s, R=21.2) errorbox  44845 sec after notice time and 44879 sec after trigger time at 2024-07-22 16:58:05 UT, with upper limit up to  17.9 mag. Observations started at twilight.  The observations began at zenith distance = 85 deg. The sun  altitude  is -13.2 deg. 

The galactic latitude b = 37 deg., longitude l = 217 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2537669

We obtain a following upper limits.  

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

   44969 | 2024-07-22 16:58:05 |         MASTER-SAAO | (08h 35m 27.35s , -03d 59m 56.9s) |   B |   180 | 13.4 |        
   45312 | 2024-07-22 17:04:48 |         MASTER-SAAO | (08h 53m 36.33s , -08d 13m 46.7s) |   C |    60 | 17.6 |        
   45392 | 2024-07-22 17:06:07 |         MASTER-SAAO | (09h 01m 42.34s , -08d 15m 29.7s) |   C |    60 | 17.8 |        
   45471 | 2024-07-22 17:07:27 |         MASTER-SAAO | (09h 06m 33.60s , -06d 19m 42.8s) |   C |    60 | 17.9 |        
   45550 | 2024-07-22 17:08:46 |         MASTER-SAAO | (09h 14m 43.30s , -06d 20m 46.9s) |   C |    60 | 17.1 |        
Filter C is a clear (unfiltred) band. 


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