TITLE:   GCN CIRCULAR
NUMBER:  31631
SUBJECT: Fermi GRB 220222A: Global MASTER-Net observations report 
DATE:    22/02/22 04:30:19 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, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov,  D. Cheryasov
(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),

B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)

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 GRB 220222A ( Fermi GBM team, GCN 31630) errorbox  697 sec after notice time and 725 sec after trigger time at 2022-02-22 02:33:23 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -18.3 deg. 

The galactic latitude b = -66 deg., longitude l = 162 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1891006

We obtain a following upper limits.  

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

     801 | 2022-02-22 02:33:23 |         MASTER-OAGH | (01h 45m 29.04s , -07d 51m 52.8s) |   C |   150 | 15.9 |        
     801 | 2022-02-22 02:33:23 |         MASTER-OAGH | (01h 44m 58.42s , -07d 24m 02.1s) |   C |   150 | 16.7 |        
    1127 | 2022-02-22 02:38:34 |         MASTER-OAGH | (01h 44m 57.56s , -07d 23m 01.8s) |   C |   180 | 16.5 |        
    1127 | 2022-02-22 02:38:34 |         MASTER-OAGH | (01h 45m 28.44s , -07d 50m 51.4s) |   C |   180 | 15.5 |        
    1469 | 2022-02-22 02:44:16 |         MASTER-OAGH | (01h 45m 36.17s , -07d 51m 45.0s) |   C |   180 | 15.8 |        
    1469 | 2022-02-22 02:44:16 |         MASTER-OAGH | (01h 45m 05.23s , -07d 24m 01.9s) |   C |   180 | 17.0 |        
    1809 | 2022-02-22 02:49:57 |         MASTER-OAGH | (01h 45m 29.37s , -07d 52m 46.6s) |   C |   180 | 16.2 |        
    1809 | 2022-02-22 02:49:57 |         MASTER-OAGH | (01h 44m 58.02s , -07d 25m 04.6s) |   C |   180 | 17.2 |        
    2175 | 2022-02-22 02:57:02 |         MASTER-OAGH | (01h 44m 51.39s , -08d 06m 51.2s) |   C |    60 | 16.8 |        
    2175 | 2022-02-22 02:57:02 |         MASTER-OAGH | (01h 44m 19.36s , -07d 39m 10.7s) |   C |    60 | 17.8 |        
    2396 | 2022-02-22 03:00:43 |         MASTER-OAGH | (01h 44m 23.89s , -06d 14m 09.8s) |   C |    60 | 16.2 |        
    2396 | 2022-02-22 03:00:43 |         MASTER-OAGH | (01h 43m 51.99s , -05d 46m 32.2s) |   C |    60 | 17.4 |        
    2624 | 2022-02-22 03:04:31 |         MASTER-OAGH | (01h 45m 29.85s , -10d 00m 32.3s) |   C |    60 | 16.0 |        
    2624 | 2022-02-22 03:04:31 |         MASTER-OAGH | (01h 44m 56.85s , -09d 32m 54.9s) |   C |    60 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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