TITLE:   GCN CIRCULAR
NUMBER:  33314
SUBJECT: Fermi  trigger No 697678542: Global MASTER-Net observations report 
DATE:    23/02/10 19:45:27 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 GRB230209.98 (trigger No 697678542,04h 15m 21.60s , -58d 33m 00.0s, R=9.42) errorbox  68985 sec after notice time and 69019 sec after trigger time at 2023-02-10 18:45:56 UT, with upper limit up to  19.7 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -14.9 deg. 

The galactic latitude b = -43 deg., longitude l = 269 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2197927

We obtain a following upper limits.  

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

   69049 | 2023-02-10 18:45:56 |         MASTER-SAAO | (04h 18m 19.25s , -55d 00m 58.8s) |   C |    60 | 17.8 |        
   69049 | 2023-02-10 18:45:56 |         MASTER-SAAO | (04h 19m 54.07s , -55d 01m 37.3s) |   C |    60 | 17.8 |        
   69141 | 2023-02-10 18:47:28 |         MASTER-SAAO | (04h 18m 18.60s , -55d 00m 01.5s) |   C |    60 | 17.8 |        
   69141 | 2023-02-10 18:47:28 |         MASTER-SAAO | (04h 19m 53.99s , -55d 00m 36.0s) |   B |    60 | 18.0 |        
   69293 | 2023-02-10 18:49:00 |         MASTER-SAAO | (04h 42m 26.03s , -60d 08m 42.3s) |   C |   180 | 19.4 |        
   69293 | 2023-02-10 18:49:00 |         MASTER-SAAO | (04h 44m 15.13s , -60d 09m 18.8s) |   C |   180 | 19.4 |        
   70877 | 2023-02-10 19:15:24 |         MASTER-SAAO | (04h 42m 31.59s , -60d 09m 03.3s) |   C |   180 | 19.7 |        
   70877 | 2023-02-10 19:15:24 |         MASTER-SAAO | (04h 44m 21.31s , -60d 09m 46.7s) |   C |   180 | 19.6 |        
   71950 | 2023-02-10 19:33:17 |         MASTER-SAAO | (04h 42m 42.65s , -60d 06m 43.1s) |   C |   180 | 19.7 |        
   71950 | 2023-02-10 19:33:17 |         MASTER-SAAO | (04h 44m 32.26s , -60d 07m 24.6s) |   C |   180 | 19.6 |        
Filter C is a clear (unfiltred) band. 


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