TITLE:   GCN CIRCULAR
NUMBER:  33295
SUBJECT: Fermi GRB 230207A: Global MASTER-Net observations report 
DATE:    23/02/07 01:00:23 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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 230207A ( Fermi GBM team, GCN 33294) errorbox  614 sec after notice time and 647 sec after trigger time at 2023-02-07 00:41:32 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -35.8 deg. 

The galactic latitude b = 18 deg., longitude l = 339 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2197290

We obtain a following upper limits.  

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

     713 | 2023-02-07 00:41:32 |         MASTER-SAAO | (15h 17m 05.81s , -31d 23m 31.7s) |   C |   130 | 18.5 |        
     713 | 2023-02-07 00:41:32 |         MASTER-SAAO | (15h 16m 03.20s , -31d 22m 38.3s) |   C |   130 | 18.4 |        
     889 | 2023-02-07 00:44:13 |         MASTER-SAAO | (15h 17m 00.65s , -31d 24m 30.0s) |   C |   160 | 18.8 |        
     889 | 2023-02-07 00:44:13 |         MASTER-SAAO | (15h 15m 57.97s , -31d 23m 36.8s) |   C |   160 | 18.6 |        
    1090 | 2023-02-07 00:47:24 |         MASTER-SAAO | (15h 16m 04.72s , -31d 23m 24.9s) |   C |   180 | 18.7 |        
Filter C is a clear (unfiltred) band. 


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