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GCN Circular 33945

Subject
LIGO/Virgo S230608aw: Global MASTER-Net observations report
Date
2023-06-09T08:52:29Z (2 years 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 LIGO/Virgo S230608aw errorbox  25858 sec after notice time and 25951 sec after trigger time at 2023-06-09 06:59:58 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -56.6 deg. 

The galactic latitude b = -86 deg., longitude l = 137 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11972

We obtain a following upper limits.  

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

   26041 | 2023-06-09 06:59:58 |         MASTER-OAFA | (01h 19m 56.47s , -27d 55m 26.0s) |   C |   180 | 17.8 |        
   26252 | 2023-06-09 07:03:29 |         MASTER-OAFA | (01h 29m 03.55s , -27d 56m 18.9s) |   C |   180 | 17.8 |        
   26464 | 2023-06-09 07:07:00 |         MASTER-OAFA | (01h 02m 55.32s , -27d 57m 03.9s) |   C |   180 | 18.2 |        
   26675 | 2023-06-09 07:10:31 |         MASTER-OAFA | (01h 11m 53.05s , -27d 55m 38.2s) |   C |   180 | 17.9 |        
   26886 | 2023-06-09 07:14:02 |         MASTER-OAFA | (01h 19m 59.93s , -27d 57m 03.7s) |   C |   180 | 17.5 |        
   27097 | 2023-06-09 07:17:34 |         MASTER-OAFA | (01h 29m 03.27s , -27d 55m 22.0s) |   C |   180 | 16.5 |        
   27308 | 2023-06-09 07:21:05 |         MASTER-OAFA | (01h 02m 48.51s , -27d 56m 12.7s) |   C |   180 | 17.8 |        
   27857 | 2023-06-09 07:30:14 |         MASTER-OAFA | (01h 27m 35.81s , -26d 03m 02.0s) |   C |   180 | 16.2 |        
   28068 | 2023-06-09 07:33:45 |         MASTER-OAFA | (01h 01m 49.27s , -26d 02m 42.2s) |   C |   180 | 15.7 |        
   28280 | 2023-06-09 07:37:16 |         MASTER-OAFA | (01h 10m 43.97s , -26d 01m 26.8s) |   C |   180 | 15.5 |        
   29314 | 2023-06-09 07:54:30 |         MASTER-OAFA | (00h 44m 58.58s , -26d 01m 03.7s) |   C |   180 | 17.8 |        
   29525 | 2023-06-09 07:58:02 |         MASTER-OAFA | (00h 53m 50.54s , -26d 02m 43.5s) |   C |   180 | 16.6 |        
   29737 | 2023-06-09 08:01:33 |         MASTER-OAFA | (00h 44m 14.20s , -24d 07m 59.0s) |   C |   180 | 17.5 |        
   30388 | 2023-06-09 08:12:24 |         MASTER-OAFA | (00h 45m 00.84s , -26d 02m 54.2s) |   C |   180 | 17.9 |        
   30920 | 2023-06-09 08:21:17 |         MASTER-OAFA | (00h 44m 20.51s , -24d 07m 17.5s) |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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