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GCN Circular 33949

Subject
LIGO/Virgo S230609u: Global MASTER-Net observations report
Date
2023-06-10T06:34:32Z (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-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 LIGO/Virgo S230609u errorbox  39392 sec after notice time and 39462 sec after trigger time at 2023-06-09 17:47:40 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 74 deg. The sun  altitude  is -26.1 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230609u errorbox  58099 sec after notice time and 58169 sec after trigger time at 2023-06-09 22:59:27 UT, with upper limit up to  18.2 mag. Observations started at twilight.  The observations began at zenith distance = 70 deg. The sun  altitude  is -16.8 deg. 

The galactic latitude b = -17 deg., longitude l = 234 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11982

We obtain a following upper limits.  

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

   39553 | 2023-06-09 17:47:40 |         MASTER-SAAO | (06h 31m 28.35s , -25d 17m 39.4s) |   C |   180 | 18.5 |        
   39553 | 2023-06-09 17:47:40 |         MASTER-SAAO | (06h 30m 41.01s , -25d 17m 37.0s) |   C |   180 | 17.0 |        
   58259 | 2023-06-09 22:59:27 |         MASTER-OAFA | (06h 10m 29.24s , -26d 46m 58.7s) |   C |   180 | 17.6 |        
   58744 | 2023-06-09 23:07:31 |         MASTER-OAFA | (06h 21m 14.48s , -24d 53m 39.3s) |   C |   180 | 18.1 |        
   59325 | 2023-06-09 23:17:12 |         MASTER-OAFA | (06h 34m 31.72s , -28d 40m 07.1s) |   C |   180 | 18.2 |        
   59537 | 2023-06-09 23:20:44 |         MASTER-OAFA | (06h 43m 40.53s , -28d 38m 44.4s) |   C |   180 | 17.6 |        
   59755 | 2023-06-09 23:24:23 |         MASTER-OAFA | (06h 32m 35.82s , -32d 29m 12.1s) |   C |   180 | 17.8 |        
   60125 | 2023-06-09 23:30:33 |         MASTER-OAFA | (06h 34m 33.29s , -28d 39m 18.4s) |   C |   180 | 17.8 |        
   60337 | 2023-06-09 23:34:04 |         MASTER-OAFA | (06h 43m 43.48s , -28d 40m 52.6s) |   C |   180 | 17.8 |        
   60568 | 2023-06-09 23:37:55 |         MASTER-OAFA | (06h 32m 42.22s , -32d 27m 43.6s) |   C |   180 | 17.5 |        
   61559 | 2023-06-09 23:54:26 |         MASTER-OAFA | (07h 00m 19.02s , -32d 26m 13.0s) |   C |   180 | 17.8 |        
   62024 | 2023-06-10 00:02:11 |         MASTER-OAFA | (06h 50m 49.87s , -32d 26m 25.3s) |   C |   180 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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