TITLE:   GCN CIRCULAR
NUMBER:  32093
SUBJECT: Fermi GRB 220523A: Global MASTER-Net observations report 
DATE:    22/05/23 04:45:21 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 GRB 220523A ( Fermi GBM team, GCN 32092) errorbox  293 sec after notice time and 330 sec after trigger time at 2022-05-23 04:17:00 UT, with upper limit up to  13.7 mag. The observations began at zenith distance = 81 deg. The sun  altitude  is -23.0 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 220523A errorbox  1093 sec after notice time and 1130 sec after trigger time at 2022-05-23 04:30:20 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 82 deg. The sun  altitude  is -79.5 deg. 

The galactic latitude b =  7 deg., longitude l = 262 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1981570

We obtain a following upper limits.  

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

     361 | 2022-05-23 04:17:00 |         MASTER-OAGH | (09h 03m 15.41s , -27d 18m 29.2s) |   C |    60 | 13.0 |        
     467 | 2022-05-23 04:18:46 |         MASTER-OAGH | (09h 12m 12.12s , -27d 17m 32.7s) |   C |    60 | 13.3 |        
    1161 | 2022-05-23 04:30:20 |         MASTER-OAFA | (09h 03m 53.93s , -36d 01m 09.5s) |   C |    60 | 16.3 |        
    1252 | 2022-05-23 04:31:52 |         MASTER-OAFA | (09h 13m 51.60s , -35d 59m 56.3s) |   C |    60 | 16.4 |        
    1443 | 2022-05-23 04:35:02 |         MASTER-OAGH | (09h 40m 56.38s , -30d 37m 34.2s) |   C |    60 | 13.7 |        
Filter C is a clear (unfiltred) band. 


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