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GCN Circular 34614

Subject
Fermi GRB 230904A: Global MASTER-Net observations report
Date
2023-09-04T11:30:48Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 230904A ( Fermi GBM team, GCN 34613Loading...
 
 ) errorbox  10127 sec after notice time and 10162 sec after trigger time at 2023-09-04 11:08:53 UT, with upper limit up to  17.4 mag. Observations started at twilight.  The observations began at zenith distance = 49 deg. The sun  altitude  is -9.8 deg. 

The galactic latitude b = -6 deg., longitude l = 13 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2265350

We obtain a following upper limits.  

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

   10192 | 2023-09-04 11:08:53 |         MASTER-Amur | (18h 25m 07.20s , +01d 19m 23.3s) |   C |    60 | 17.1 |        
   10366 | 2023-09-04 11:11:47 |         MASTER-Amur | (18h 32m 59.20s , +01d 19m 54.6s) |   C |    60 | 17.1 |        
   10463 | 2023-09-04 11:13:23 |         MASTER-Amur | (18h 43m 34.46s , +01d 00m 41.9s) |   C |    60 | 17.4 |        
Filter C is a clear (unfiltred) band. 


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