TITLE:   GCN CIRCULAR
NUMBER:  32424
SUBJECT: Fermi GRB 220724A: Global MASTER-Net observations report 
DATE:    22/07/25 05:30:21 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, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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. Gres, N.M. Budnev
(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),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 220724A ( Fermi GBM team, GCN 32423) errorbox  16981 sec after notice time and 17018 sec after trigger time at 2022-07-25 04:26:41 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 58 deg. The sun  altitude  is -78.3 deg. 

The galactic latitude b = 28 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2040301

We obtain a following upper limits.  

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

   17108 | 2022-07-25 04:26:41 |         MASTER-OAFA | (15h 46m 13.07s , -19d 21m 40.3s) |   C |   180 | 17.6 |        
   17742 | 2022-07-25 04:37:15 |         MASTER-OAFA | (15h 46m 12.83s , -19d 19m 22.9s) |   C |   180 | 17.9 |        
   17987 | 2022-07-25 04:42:20 |         MASTER-OAFA | (15h 55m 41.17s , -22d 23m 42.3s) |   C |    60 | 16.7 |        
   18078 | 2022-07-25 04:43:51 |         MASTER-OAFA | (15h 52m 36.37s , -14d 42m 48.9s) |   C |    60 | 17.1 |        
   18445 | 2022-07-25 04:49:58 |         MASTER-OAFA | (15h 36m 33.55s , -15d 43m 53.3s) |   C |    60 | 17.6 |        
   18811 | 2022-07-25 04:56:04 |         MASTER-OAFA | (15h 47m 09.28s , -20d 53m 04.9s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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