TITLE:   GCN CIRCULAR
NUMBER:  32267
SUBJECT: Fermi GRB 220624A: Global MASTER-Net observations report 
DATE:    22/06/25 00:15:21 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 220624A ( Fermi GBM team, GCN 32256) errorbox  73147 sec after notice time and 73182 sec after trigger time at 2022-06-24 23:18:17 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 53 deg. The sun  altitude  is -20.2 deg. 

The galactic latitude b = 76 deg., longitude l = 240 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2014237

We obtain a following upper limits.  

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

   73212 | 2022-06-24 23:18:17 |         MASTER-OAFA | (11h 46m 48.60s , +19d 37m 00.6s) |   C |    60 | 16.8 |        
   73488 | 2022-06-24 23:22:52 |         MASTER-OAFA | (11h 55m 57.05s , +21d 32m 42.9s) |   C |    60 | 16.0 |        
   73599 | 2022-06-24 23:24:44 |         MASTER-OAFA | (12h 04m 29.08s , +21d 31m 52.7s) |   C |    60 | 15.5 |        
   73710 | 2022-06-24 23:26:35 |         MASTER-OAFA | (11h 54m 38.45s , +17d 43m 50.5s) |   C |    60 | 16.4 |        
   74306 | 2022-06-24 23:36:31 |         MASTER-OAFA | (11h 46m 41.60s , +19d 37m 49.0s) |   C |    60 | 16.0 |        
   74397 | 2022-06-24 23:38:02 |         MASTER-OAFA | (11h 55m 14.99s , +19d 38m 51.1s) |   C |    60 | 15.5 |        
   74671 | 2022-06-24 23:42:35 |         MASTER-OAFA | (11h 54m 39.68s , +17d 43m 02.0s) |   C |    60 | 16.2 |        
   75428 | 2022-06-24 23:55:13 |         MASTER-OAFA | (11h 46m 48.65s , +19d 36m 57.2s) |   C |    60 | 12.3 |        
   75520 | 2022-06-24 23:56:44 |         MASTER-OAFA | (11h 55m 16.98s , +19d 38m 15.4s) |   C |    60 | 14.0 |        
   75611 | 2022-06-24 23:58:16 |         MASTER-OAFA | (11h 55m 54.10s , +21d 31m 13.9s) |   C |    60 | 13.8 |        
   75702 | 2022-06-24 23:59:47 |         MASTER-OAFA | (12h 04m 34.80s , +21d 32m 30.2s) |   C |    60 | 12.3 |        
Filter C is a clear (unfiltred) band. 


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