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GCN Circular 33601

Subject
Fermi GRB 230409A: Global MASTER-Net observations report
Date
2023-04-09T23:30:18Z (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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 230409A ( Fermi GBM team, GCN 33591Not found
 
 
) errorbox  78316 sec after notice time and 78350 sec after trigger time at 2023-04-09 22:34:04 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 81 deg. The sun  altitude  is -36.1 deg. 

The galactic latitude b = -23 deg., longitude l = 80 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2209420

We obtain a following upper limits.  

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

   78381 | 2023-04-09 22:34:04 |   MASTER-Kislovodsk | (21h 32m 27.85s , +27d 25m 20.5s) |   C |    60 | 15.8 |        
   80688 | 2023-04-09 23:12:31 |   MASTER-Kislovodsk | (22h 01m 31.30s , +25d 32m 16.4s) |   C |    60 | 15.9 |        
   80778 | 2023-04-09 23:14:01 |   MASTER-Kislovodsk | (21h 44m 39.09s , +25d 34m 00.1s) |   C |    60 | 16.2 |        
   80867 | 2023-04-09 23:15:30 |   MASTER-Kislovodsk | (21h 49m 39.80s , +27d 26m 52.0s) |   C |    60 | 15.9 |        
   81377 | 2023-04-09 23:24:00 |   MASTER-Kislovodsk | (21h 32m 28.84s , +27d 28m 26.5s) |   C |    60 | 16.4 |        
   81467 | 2023-04-09 23:25:30 |   MASTER-Kislovodsk | (21h 57m 57.31s , +23d 37m 58.9s) |   C |    60 | 14.4 |        
Filter C is a clear (unfiltred) band. 


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