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GCN Circular 34050

Subject
LIGO/Virgo S230620ad: Global MASTER-Net observations report
Date
2023-06-21T12:42:45Z (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 S230620ad errorbox  22840 sec after notice time and 22921 sec after trigger time at 2023-06-20 10:12:55 UT, with upper limit up to  18.4 mag. Observations started at twilight.  The observations began at zenith distance = 59 deg. The sun  altitude  is -16.5 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230620ad errorbox  85150 sec after notice time and 85231 sec after trigger time at 2023-06-21 03:31:25 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 69 deg. The sun  altitude  is -26.2 deg. 

The galactic latitude b = 67 deg., longitude l = 77 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12188

We obtain a following upper limits.  

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

      87 | 2023-06-20 03:52:15 |             MASTER- | (14h 15m 26.83s , +41d 17m 28.0s) |   C |    10 | 12.1 |        
     122 | 2023-06-20 03:52:45 |             MASTER- | (14h 15m 32.58s , +41d 17m 43.1s) |   C |    20 | 13.7 |        
     167 | 2023-06-20 03:53:25 |             MASTER- | (14h 15m 29.57s , +41d 19m 03.9s) |   C |    30 | 14.0 |        
     222 | 2023-06-20 03:54:16 |             MASTER- | (14h 15m 29.50s , +41d 17m 45.1s) |   C |    40 | 13.5 |        
     287 | 2023-06-20 03:55:16 |             MASTER- | (14h 15m 32.17s , +41d 19m 02.2s) |   C |    50 | 14.6 |        
     363 | 2023-06-20 03:56:26 |             MASTER- | (14h 15m 25.14s , +41d 18m 22.9s) |   C |    60 | 15.6 |        
     453 | 2023-06-20 03:57:46 |             MASTER- | (14h 15m 24.85s , +41d 19m 19.7s) |   C |    80 | 16.6 |        
     563 | 2023-06-20 03:59:26 |             MASTER- | (14h 15m 30.65s , +41d 18m 15.6s) |   C |   100 | 16.5 |        
     693 | 2023-06-20 04:01:26 |             MASTER- | (14h 15m 25.13s , +41d 17m 08.7s) |   C |   120 | 16.5 |        
   23012 | 2023-06-20 10:12:55 |         MASTER-OAFA | (04h 26m 47.26s , -39d 16m 11.6s) |   C |   180 | 18.4 |        
   23775 | 2023-06-20 10:25:38 |         MASTER-OAFA | (04h 26m 43.56s , -39d 16m 49.5s) |   C |   180 | 17.8 |        
   23986 | 2023-06-20 10:29:10 |         MASTER-OAFA | (04h 37m 04.90s , -39d 16m 08.2s) |   C |   180 | 16.3 |        
   78462 | 2023-06-21 01:37:05 |         MASTER-OAFA | (11h 35m 53.32s , -33d 12m 36.7s) |   C |   180 | 12.9 |        
   78776 | 2023-06-21 01:42:19 |         MASTER-OAFA | (11h 41m 08.44s , -33d 12m 35.7s) |   C |   180 | 12.6 |        
   79723 | 2023-06-21 01:58:06 |         MASTER-OAFA | (11h 55m 48.92s , -33d 12m 34.5s) |   C |   180 | 12.2 |        
   85322 | 2023-06-21 03:31:25 |         MASTER-SAAO | (04h 50m 29.16s , -44d 33m 10.0s) |   C |   180 | 18.4 |        
   85322 | 2023-06-21 03:31:25 |         MASTER-SAAO | (04h 51m 32.07s , -44d 33m 51.5s) |   C |   180 | 18.3 |        
   85533 | 2023-06-21 03:34:57 |         MASTER-SAAO | (05h 02m 41.63s , -44d 31m 26.8s) |   C |   180 | 18.0 |        
   85533 | 2023-06-21 03:34:57 |         MASTER-SAAO | (05h 01m 38.75s , -44d 30m 45.3s) |   C |   180 | 18.1 |        
   85744 | 2023-06-21 03:38:28 |         MASTER-SAAO | (04h 18m 53.87s , -36d 57m 15.0s) |   C |   180 | 17.7 |        
   85744 | 2023-06-21 03:38:28 |         MASTER-SAAO | (04h 19m 50.51s , -36d 57m 57.0s) |   C |   180 | 17.6 |        
   85956 | 2023-06-21 03:41:59 |         MASTER-SAAO | (04h 28m 47.08s , -36d 57m 30.5s) |   C |   180 | 13.4 |        
Filter C is a clear (unfiltred) band. 


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


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