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GCN Circular 33937

Subject
Fermi GRB 230603A: Global MASTER-Net observations report
Date
2023-06-07T21:03:51Z (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-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 230603A ( Fermi GBM team, GCN 33910Not found
 
 
) errorbox  1 days 62021 sec after notice time and 1 days 62028 sec after trigger time at 2023-06-05 05:49:18 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -71.0 deg. 

The galactic latitude b = -16 deg., longitude l = 28 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2220782

We obtain a following upper limits.  

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

  148519 | 2023-06-05 05:49:18 |         MASTER-OAFA | (19h 36m 44.32s , -12d 09m 24.2s) |   C |   180 | 16.9 |        
  148699 | 2023-06-05 05:49:18 |         MASTER-OAFA | (19h 36m 44.32s , -12d 09m 24.2s) |   C |   540 | 17.4 |  Coadd 
  148730 | 2023-06-05 05:52:49 |         MASTER-OAFA | (19h 36m 49.42s , -12d 10m 24.5s) |   C |   180 | 16.9 |        
  148942 | 2023-06-05 05:56:21 |         MASTER-OAFA | (19h 36m 42.96s , -12d 11m 25.1s) |   C |   180 | 16.8 |        
  149797 | 2023-06-05 06:10:36 |         MASTER-OAFA | (19h 36m 48.72s , -12d 09m 29.5s) |   C |   180 | 15.5 |        
  150804 | 2023-06-05 06:27:23 |         MASTER-OAFA | (19h 36m 50.02s , -12d 11m 07.1s) |   C |   180 | 16.7 |        
  154240 | 2023-06-05 07:24:39 |         MASTER-OAFA | (19h 29m 31.33s , -14d 34m 07.0s) |   C |   180 | 16.9 |        
  155299 | 2023-06-05 07:42:18 |         MASTER-OAFA | (19h 29m 23.79s , -14d 32m 35.0s) |   C |   180 | 17.2 |        
  155934 | 2023-06-05 07:52:53 |         MASTER-OAFA | (19h 37m 42.65s , -14d 33m 21.1s) |   C |   180 | 16.9 |        
  165891 | 2023-06-05 10:38:50 |         MASTER-OAFA | (19h 21m 33.74s , -13d 31m 44.8s) |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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