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GCN Circular 34062

Subject
LIGO/Virgo S230621ad: Global MASTER-Net observations report
Date
2023-06-22T14:30:10Z (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-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 S230621ad errorbox  37288 sec after notice time and 37379 sec after trigger time at 2023-06-21 16:45:21 UT, with upper limit up to  18.9 mag. Observations started at twilight.  The observations began at zenith distance = 57 deg. The sun  altitude  is -13.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LIGO/Virgo S230621ad errorbox  63414 sec after notice time and 63506 sec after trigger time at 2023-06-22 00:00:48 UT, with upper limit up to  17.4 mag. Observations started at twilight.  The observations began at zenith distance = 62 deg. The sun  altitude  is -13.1 deg. 

The galactic latitude b = 56 deg., longitude l = 251 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12206

We obtain a following upper limits.  

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

   37470 | 2023-06-21 16:45:21 |         MASTER-SAAO | (07h 48m 40.71s , -21d 29m 01.2s) |   C |   180 | 18.1 |        
   37470 | 2023-06-21 16:45:21 |         MASTER-SAAO | (07h 49m 28.38s , -21d 29m 16.1s) |   C |   180 | 18.1 |        
   38312 | 2023-06-21 16:59:24 |         MASTER-SAAO | (07h 48m 34.31s , -21d 27m 00.7s) |   C |   180 | 18.5 |        
   38312 | 2023-06-21 16:59:24 |         MASTER-SAAO | (07h 49m 21.60s , -21d 27m 18.9s) |   C |   180 | 18.6 |        
   40475 | 2023-06-21 17:35:26 |         MASTER-SAAO | (10h 09m 35.73s , -51d 51m 41.6s) |   C |   180 | 18.4 |        
   40475 | 2023-06-21 17:35:26 |         MASTER-SAAO | (10h 10m 49.05s , -51d 51m 28.7s) |   C |   180 | 18.2 |        
   40686 | 2023-06-21 17:38:57 |         MASTER-SAAO | (10h 22m 31.22s , -51d 53m 37.7s) |   C |   180 | 18.4 |        
   40686 | 2023-06-21 17:38:57 |         MASTER-SAAO | (10h 23m 44.70s , -51d 53m 21.8s) |   C |   180 | 18.3 |        
   40898 | 2023-06-21 17:42:29 |         MASTER-SAAO | (08h 39m 39.51s , -38d 33m 01.8s) |   C |   180 | 18.8 |        
   40898 | 2023-06-21 17:42:29 |         MASTER-SAAO | (08h 40m 36.56s , -38d 33m 43.0s) |   C |   180 | 18.8 |        
   41109 | 2023-06-21 17:46:00 |         MASTER-SAAO | (08h 49m 53.97s , -38d 31m 56.2s) |   C |   180 | 18.9 |        
   41109 | 2023-06-21 17:46:00 |         MASTER-SAAO | (08h 50m 51.17s , -38d 32m 37.7s) |   C |   180 | 18.8 |        
   41320 | 2023-06-21 17:49:31 |         MASTER-SAAO | (10h 09m 41.45s , -51d 51m 59.9s) |   C |   180 | 18.5 |        
   41320 | 2023-06-21 17:49:31 |         MASTER-SAAO | (10h 10m 54.91s , -51d 51m 57.2s) |   C |   180 | 18.3 |        
   41531 | 2023-06-21 17:53:03 |         MASTER-SAAO | (10h 22m 31.57s , -51d 53m 09.9s) |   C |   180 | 18.5 |        
   41531 | 2023-06-21 17:53:03 |         MASTER-SAAO | (10h 23m 45.10s , -51d 53m 02.7s) |   C |   180 | 18.4 |        
   63586 | 2023-06-22 00:00:48 |   MASTER-Kislovodsk | (02h 45m 42.84s , +41d 55m 00.9s) |   C |   160 | 17.0 |        
   63777 | 2023-06-22 00:03:48 |   MASTER-Kislovodsk | (02h 45m 43.00s , +41d 53m 31.6s) |   C |   180 | 17.4 |        
   63977 | 2023-06-22 00:07:09 |   MASTER-Kislovodsk | (02h 45m 45.48s , +41d 55m 03.9s) |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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


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