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GCN Circular 33597

Subject
Fermi trigger No 702745263: Global MASTER-Net observations report
Date
2023-04-09T17:45:20Z (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-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 GRB230409.63 (trigger No 702745263,06h 41m 57.60s , +44d 55m 12.0s, R=1.15) errorbox  8136 sec after notice time and 8177 sec after trigger time at 2023-04-09 17:17:15 UT, with upper limit up to  17.9 mag. Observations started at twilight.  The observations began at zenith distance = 78 deg. The sun  altitude  is -11.8 deg. 

The galactic latitude b = 18 deg., longitude l = 171 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2209536

We obtain a following upper limits.  

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

    8267 | 2023-04-09 17:17:15 |         MASTER-SAAO | (06h 40m 57.72s , +44d 54m 48.8s) |   C |   180 | 16.8 |        
    8267 | 2023-04-09 17:17:15 |         MASTER-SAAO | (06h 42m 04.18s , +44d 54m 52.6s) |   C |   180 | 16.5 |        
    8687 | 2023-04-09 17:25:15 |         MASTER-SAAO | (06h 41m 00.36s , +44d 53m 46.1s) |   C |    60 | 17.4 |        
    8687 | 2023-04-09 17:25:15 |         MASTER-SAAO | (06h 42m 07.06s , +44d 53m 49.7s) |   C |    60 | 17.3 |        
    8779 | 2023-04-09 17:26:46 |         MASTER-SAAO | (06h 52m 21.61s , +44d 55m 10.5s) |   C |    60 | 17.5 |        
    8779 | 2023-04-09 17:26:46 |         MASTER-SAAO | (06h 53m 28.49s , +44d 55m 13.6s) |   C |    60 | 17.4 |        
    8859 | 2023-04-09 17:28:07 |         MASTER-SAAO | (06h 28m 13.55s , +43d 01m 37.6s) |   C |    60 | 17.5 |        
    8859 | 2023-04-09 17:28:07 |         MASTER-SAAO | (06h 29m 18.41s , +43d 01m 40.8s) |   C |    60 | 17.5 |        
    8949 | 2023-04-09 17:29:37 |         MASTER-SAAO | (06h 39m 17.33s , +43d 00m 41.2s) |   C |    60 | 17.8 |        
    8949 | 2023-04-09 17:29:37 |         MASTER-SAAO | (06h 40m 22.28s , +43d 00m 44.4s) |   C |    60 | 17.8 |        
    9029 | 2023-04-09 17:30:57 |         MASTER-SAAO | (06h 49m 06.75s , +43d 00m 08.4s) |   C |    60 | 17.9 |        
    9029 | 2023-04-09 17:30:57 |         MASTER-SAAO | (06h 50m 11.74s , +43d 00m 11.7s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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