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GCN Circular 34654

Subject
Fermi GRB 230911B: Global MASTER-Net observations report
Date
2023-09-11T05:45:51Z (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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 230911B ( Fermi GBM team, GCN 34653Not found
 
 
) errorbox  928 sec after notice time and 961 sec after trigger time at 2023-09-11 04:41:51 UT, with upper limit up to  13.2 mag. The observations began at zenith distance = 24 deg. The sun  altitude  is -63.7 deg. 

The galactic latitude b = -59 deg., longitude l = 326 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2268866

We obtain a following upper limits.  

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

    1052 | 2023-09-11 04:41:51 |         MASTER-OAFA | (23h 25m 02.98s , -55d 03m 29.7s) |   C |   180 | 12.1 |        
    1579 | 2023-09-11 04:50:38 |         MASTER-OAFA | (23h 24m 58.92s , -55d 02m 04.7s) |   C |   180 | 13.2 |        
    2059 | 2023-09-11 04:58:39 |         MASTER-OAFA | (23h 25m 30.11s , -55d 04m 12.8s) |   C |   180 | 13.1 |        
    2630 | 2023-09-11 05:08:09 |         MASTER-OAFA | (23h 25m 03.23s , -55d 03m 59.3s) |   C |   180 | 12.4 |        
Filter C is a clear (unfiltred) band. 


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