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GCN Circular 34233

Subject
Fermi GRB 230723A: Global MASTER-Net observations report
Date
2023-07-23T06:16:32Z (a year ago)
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 230723A ( Fermi GBM team, GCN 34232Not found
 
 
) errorbox  552 sec after notice time and 586 sec after trigger time at 2023-07-23 04:48:29 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 57 deg. The sun  altitude  is -79.1 deg. 

The galactic latitude b = -46 deg., longitude l = 299 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2243548

We obtain a following upper limits.  

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

     646 | 2023-07-23 04:48:29 |         MASTER-OAFA | (01h 22m 59.72s , -71d 17m 29.3s) |   C |   120 | 15.9 |        
     801 | 2023-07-23 04:48:29 |         MASTER-OAFA | (01h 22m 59.76s , -71d 17m 29.2s) |   C |   430 | 17.0 |  Coadd 
     795 | 2023-07-23 04:50:48 |         MASTER-OAFA | (01h 22m 53.01s , -71d 18m 28.8s) |   C |   140 | 16.5 |        
     970 | 2023-07-23 04:53:28 |         MASTER-OAFA | (01h 22m 54.39s , -71d 17m 31.5s) |   C |   170 | 16.7 |        
    1165 | 2023-07-23 04:56:38 |         MASTER-OAFA | (01h 23m 00.17s , -71d 18m 30.9s) |   C |   180 | 15.6 |        
Filter C is a clear (unfiltred) band. 


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