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GCN Circular 34021

Subject
LIGO/Virgo S230619i: Global MASTER-Net observations report
Date
2023-06-19T10:24:35Z (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 LIGO/Virgo S230619i errorbox  23805 sec after notice time and 23848 sec after trigger time at 2023-06-19 10:10:29 UT, with upper limit up to  12.5 mag. Observations started at twilight.  The observations began at zenith distance = 67 deg. The sun  altitude  is -17.0 deg. 

The galactic latitude b = -48 deg., longitude l = 216 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12138

We obtain a following upper limits.  

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

   22662 | 2023-06-19 09:49:13 |             MASTER- | (23h 42m 22.90s , +81d 39m 09.5s) |   C |   180 | 18.7 |        
   22862 | 2023-06-19 09:52:33 |             MASTER- | (00h 35m 00.64s , +81d 38m 18.1s) |   C |   180 | 16.6 |        
   23062 | 2023-06-19 09:55:53 |             MASTER- | (23h 45m 21.09s , +79d 46m 41.0s) |   C |   180 | 18.5 |        
   23263 | 2023-06-19 09:59:13 |             MASTER- | (00h 28m 33.71s , +79d 44m 16.3s) |   C |   180 | 16.1 |        
   23463 | 2023-06-19 10:02:34 |             MASTER- | (23h 41m 51.58s , +81d 41m 09.0s) |   C |   180 | 18.4 |        
   23664 | 2023-06-19 10:05:55 |             MASTER- | (00h 34m 39.01s , +81d 38m 46.3s) |   C |   180 | 16.4 |        
   23865 | 2023-06-19 10:09:15 |             MASTER- | (23h 44m 51.68s , +79d 45m 15.0s) |   C |   180 | 18.5 |        
   23938 | 2023-06-19 10:10:29 |         MASTER-OAFA | (04h 21m 32.87s , -20d 16m 47.6s) |   C |   180 | 12.5 |        
   24065 | 2023-06-19 10:12:36 |             MASTER- | (00h 28m 16.55s , +79d 43m 58.3s) |   C |   180 | 16.3 |        
Filter C is a clear (unfiltred) band. 


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