TITLE:   GCN CIRCULAR
NUMBER:  33765
SUBJECT: Fermi  trigger No 705446499: Global MASTER-Net observations report
DATE:    23/05/11 08:30:37 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 GRB230510.89 (trigger No 705446499,00h 18m 07.20s , +30d 03m 00.0s, R=1) errorbox  24859 sec after notice time and 24865 sec after trigger time at 2023-05-11 04:15:59 UT, with upper limit up to  15.4 mag. Observations started at twilight.  The observations began at zenith distance = 78 deg. The sun  altitude  is -13.2 deg. 

The galactic latitude b = -32 deg., longitude l = 115 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2215917

We obtain a following upper limits.  

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

   24896 | 2023-05-11 04:15:59 |         MASTER-SAAO | (00h 10m 43.55s , +29d 26m 26.1s) |   C |    60 | 15.4 |        
   24896 | 2023-05-11 04:15:59 |         MASTER-SAAO | (00h 11m 34.98s , +29d 25m 36.2s) |   C |    60 | 15.1 |        
   25198 | 2023-05-11 04:21:02 |         MASTER-SAAO | (00h 20m 47.13s , +29d 25m 15.6s) |   C |    60 | 13.8 |        
Filter C is a clear (unfiltred) band. 


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