TITLE:   GCN CIRCULAR
NUMBER:  31945
SUBJECT: Fermi  trigger No 672492774: Global MASTER-Net observations report 
DATE:    22/04/25 04:15:21 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-OAGH robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB220424.48 (trigger No 672492774,16h 07m 00.00s , +40d 46m 48.0s, R=2.12) errorbox  20 sec after notice time and 58499 sec after trigger time at 2022-04-25 03:47:48 UT, with upper limit up to  19.1 mag. The observations began at zenith distance = 64 deg. The sun  altitude  is -23.2 deg. 

The galactic latitude b = 47 deg., longitude l = 65 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1953641

We obtain a following upper limits.  

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

   58589 | 2022-04-25 03:47:48 |         MASTER-OAGH | (16h 06m 52.64s , +40d 48m 46.6s) |   C |   180 | 18.5 |        
   58589 | 2022-04-25 03:47:48 |         MASTER-OAGH | (16h 07m 39.73s , +40d 23m 24.3s) |   C |   180 | 18.9 |        
   58790 | 2022-04-25 03:51:09 |         MASTER-OAGH | (16h 06m 47.32s , +40d 47m 48.0s) |   C |   180 | 18.3 |        
   58790 | 2022-04-25 03:51:09 |         MASTER-OAGH | (16h 07m 34.14s , +40d 22m 28.2s) |   C |   180 | 19.1 |        
   58992 | 2022-04-25 03:54:31 |         MASTER-OAGH | (16h 06m 47.83s , +40d 48m 46.5s) |   C |   180 | 18.3 |        
   58992 | 2022-04-25 03:54:31 |         MASTER-OAGH | (16h 07m 34.46s , +40d 23m 26.1s) |   C |   180 | 19.1 |        
   59194 | 2022-04-25 03:57:52 |         MASTER-OAGH | (16h 06m 54.33s , +40d 47m 47.9s) |   C |   180 | 18.3 |        
   59194 | 2022-04-25 03:57:52 |         MASTER-OAGH | (16h 07m 40.72s , +40d 22m 26.2s) |   C |   180 | 19.1 |        
   59340 | 2022-04-25 04:01:19 |         MASTER-OAGH | (16h 02m 48.97s , +41d 06m 01.8s) |   C |    60 | 18.0 |        
   59340 | 2022-04-25 04:01:19 |         MASTER-OAGH | (16h 03m 35.11s , +40d 40m 34.7s) |   C |    60 | 18.6 |        
   59422 | 2022-04-25 04:02:40 |         MASTER-OAGH | (16h 13m 22.48s , +41d 07m 31.0s) |   C |    60 | 17.7 |        
   59422 | 2022-04-25 04:02:40 |         MASTER-OAGH | (16h 14m 09.10s , +40d 42m 10.8s) |   C |    60 | 18.5 |        
   59504 | 2022-04-25 04:04:03 |         MASTER-OAGH | (15h 55m 52.24s , +39d 13m 34.7s) |   C |    60 | 18.0 |        
   59504 | 2022-04-25 04:04:03 |         MASTER-OAGH | (15h 56m 36.77s , +38d 48m 05.8s) |   C |    60 | 18.7 |        
Filter C is a clear (unfiltred) band. 


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