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GCN Circular 34619

Subject
Fermi GRB 230903A: Global MASTER-Net observations report
Date
2023-09-04T19:31:00Z (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-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 230903A ( Fermi GBM team, GCN 34608Loading...
 
 ) errorbox  49439 sec after notice time and 49475 sec after trigger time at 2023-09-04 07:07:34 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 24 deg. The sun  altitude  is -47.1 deg. 

MASTER-Amur robotic telescope  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 230903A errorbox  83217 sec after notice time and 83253 sec after trigger time at 2023-09-04 16:30:32 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 50 deg. The sun  altitude  is -31.3 deg. 

The galactic latitude b = -76 deg., longitude l = 128 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2264968

We obtain a following upper limits.  

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

   49505 | 2023-09-04 07:07:34 |         MASTER-OAFA | (23h 45m 07.73s , -21d 40m 56.2s) |   C |    60 | 18.3 |        
   50337 | 2023-09-04 07:21:25 |         MASTER-OAFA | (23h 45m 12.23s , -21d 40m 04.4s) |   C |    60 | 18.3 |        
   83283 | 2023-09-04 16:30:32 |         MASTER-Amur | (00h 45m 02.38s , +01d 03m 22.9s) |   C |    60 | 16.4 |        
   83363 | 2023-09-04 16:31:51 |         MASTER-Amur | (00h 52m 59.10s , +01d 05m 05.8s) |   C |    60 | 16.5 |        
   83442 | 2023-09-04 16:33:11 |         MASTER-Amur | (00h 44m 55.77s , +02d 58m 32.3s) |   C |    60 | 16.5 |        
   83522 | 2023-09-04 16:34:30 |         MASTER-Amur | (00h 52m 50.71s , +02d 58m 14.6s) |   C |    60 | 16.2 |        
   83941 | 2023-09-04 16:41:29 |         MASTER-Amur | (00h 44m 58.62s , +01d 04m 26.3s) |   C |    60 | 16.2 |        
   84021 | 2023-09-04 16:42:49 |         MASTER-Amur | (00h 52m 58.54s , +01d 03m 22.6s) |   C |    60 | 16.2 |        
   84100 | 2023-09-04 16:44:08 |         MASTER-Amur | (00h 44m 54.16s , +02d 58m 06.4s) |   C |    60 | 16.2 |        
   84180 | 2023-09-04 16:45:28 |         MASTER-Amur | (00h 52m 50.10s , +02d 57m 42.0s) |   C |    60 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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