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GCN Circular 34634

Subject
Fermi GRB 230906A: Global MASTER-Net observations report
Date
2023-09-07T03:30:54Z (a year 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-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 GRB 230906A ( Fermi GBM team, GCN 34631Loading...
 
 ) errorbox  30270 sec after notice time and 30304 sec after trigger time at 2023-09-06 21:20:11 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 79 deg. The sun  altitude  is -58.8 deg. 

The galactic latitude b = -34 deg., longitude l = 254 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2266531

We obtain a following upper limits.  

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

   30334 | 2023-09-06 21:20:11 |         MASTER-SAAO | (05h 00m 24.99s , -46d 27m 50.7s) |   C |    60 | 18.0 |        
   30505 | 2023-09-06 21:23:02 |         MASTER-SAAO | (05h 12m 37.40s , -50d 13m 19.5s) |   C |    60 | 18.3 |        
   30755 | 2023-09-06 21:27:12 |         MASTER-SAAO | (05h 11m 27.14s , -48d 21m 19.4s) |   C |    60 | 18.4 |        
   30835 | 2023-09-06 21:28:32 |         MASTER-SAAO | (05h 23m 34.07s , -48d 20m 18.0s) |   C |    60 | 18.1 |        
   30927 | 2023-09-06 21:30:03 |         MASTER-SAAO | (05h 23m 47.74s , -50d 14m 12.7s) |   C |    60 | 18.2 |        
Filter C is a clear (unfiltred) band. 


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