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GCN Circular 34018

Subject
LIGO/Virgo S230619x: Global MASTER-Net observations report
Date
2023-06-19T05:58:42Z (8 months 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 S230619x errorbox  139 sec after notice time and 299 sec after trigger time at 2023-06-19 05:43:59 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -73.1 deg. 

The galactic latitude b = -44 deg., longitude l = 314 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12144

We obtain a following upper limits.  

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

     329 | 2023-06-19 05:43:59 |         MASTER-OAFA | (23h 08m 22.95s , -72d 18m 00.4s) |   C |    60 | 18.5 |        
     426 | 2023-06-19 05:45:30 |         MASTER-OAFA | (23h 08m 25.94s , -72d 16m 08.7s) |   C |    70 | 18.5 |        
     537 | 2023-06-19 05:47:11 |         MASTER-OAFA | (23h 08m 21.02s , -72d 17m 04.5s) |   C |    90 | 18.7 |        
     673 | 2023-06-19 05:49:13 |         MASTER-OAFA | (23h 08m 21.80s , -72d 16m 04.0s) |   C |   120 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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


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