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GCN Circular 33999

Subject
LIGO/Virgo S230618k: Global MASTER-Net observations report
Date
2023-06-18T07:07:32Z (10 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 S230618k errorbox  155 sec after notice time and 201 sec after trigger time at 2023-06-18 05:01:08 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -80.5 deg. 

The galactic latitude b = 66 deg., longitude l = 151 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12099

We obtain a following upper limits.  

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

     272 | 2023-06-18 05:00:48 |             MASTER- | (13h 05m 47.06s , +03d 01m 21.0s) |   C |   180 | 17.5 |        
     292 | 2023-06-18 05:01:08 |         MASTER-OAFA | (13h 04m 39.22s , +03d 56m 00.1s) |   C |   180 | 17.7 |        
     611 | 2023-06-18 05:06:27 |             MASTER- | (13h 05m 45.21s , +03d 02m 35.5s) |   C |   180 | 17.5 |        
     685 | 2023-06-18 05:07:41 |         MASTER-OAFA | (13h 04m 38.75s , +03d 56m 55.5s) |   C |   180 | 17.4 |        
     896 | 2023-06-18 05:11:13 |         MASTER-OAFA | (13h 04m 33.53s , +03d 55m 56.0s) |   C |   180 | 17.3 |        
     950 | 2023-06-18 05:12:07 |             MASTER- | (13h 05m 45.48s , +03d 00m 24.9s) |   C |   180 | 17.4 |        
    1144 | 2023-06-18 05:15:21 |         MASTER-OAFA | (13h 04m 39.29s , +03d 55m 56.5s) |   C |   180 | 17.0 |        
    1292 | 2023-06-18 05:17:48 |             MASTER- | (13h 05m 48.00s , +03d 01m 29.2s) |   C |   180 | 17.5 |        
    1356 | 2023-06-18 05:18:52 |         MASTER-OAFA | (13h 04m 32.18s , +03d 54m 57.5s) |   C |   180 | 16.9 |        
    1632 | 2023-06-18 05:23:29 |             MASTER- | (13h 05m 42.33s , +03d 00m 21.8s) |   C |   180 | 17.4 |        
    1928 | 2023-06-18 05:28:25 |         MASTER-OAFA | (13h 04m 30.92s , +03d 55m 01.5s) |   C |   180 | 16.5 |        
    1970 | 2023-06-18 05:29:07 |             MASTER- | (13h 05m 43.64s , +03d 00m 56.9s) |   C |   180 | 17.5 |        
    2310 | 2023-06-18 05:34:47 |             MASTER- | (13h 05m 50.20s , +02d 59m 33.6s) |   C |   180 | 17.5 |        
    2650 | 2023-06-18 05:40:26 |             MASTER- | (13h 05m 43.38s , +02d 58m 07.1s) |   C |   180 | 17.5 |        
    2989 | 2023-06-18 05:46:06 |             MASTER- | (13h 05m 51.08s , +02d 57m 49.5s) |   C |   180 | 17.5 |        
    3330 | 2023-06-18 05:51:47 |             MASTER- | (13h 05m 48.14s , +02d 59m 05.5s) |   C |   180 | 17.5 |        
    3670 | 2023-06-18 05:57:27 |             MASTER- | (13h 05m 48.59s , +02d 57m 10.3s) |   C |   180 | 17.5 |        
    4011 | 2023-06-18 06:03:08 |             MASTER- | (13h 05m 51.22s , +02d 58m 24.1s) |   C |   180 | 17.5 |        
    4351 | 2023-06-18 06:08:48 |             MASTER- | (13h 05m 45.56s , +02d 57m 00.2s) |   C |   180 | 17.5 |        
    4692 | 2023-06-18 06:14:29 |             MASTER- | (13h 05m 46.01s , +02d 57m 32.2s) |   C |   180 | 17.5 |        
    5032 | 2023-06-18 06:20:09 |             MASTER- | (13h 05m 52.68s , +02d 56m 09.9s) |   C |   180 | 17.5 |        
    5373 | 2023-06-18 06:25:50 |             MASTER- | (13h 05m 47.05s , +02d 54m 44.4s) |   C |   180 | 17.5 |        
    5715 | 2023-06-18 06:31:31 |             MASTER- | (13h 05m 53.66s , +02d 54m 48.1s) |   C |   180 | 17.5 |        
    6055 | 2023-06-18 06:37:11 |             MASTER- | (13h 05m 52.01s , +02d 55m 24.4s) |   C |   180 | 17.5 |        
    6396 | 2023-06-18 06:42:52 |             MASTER- | (13h 05m 52.52s , +02d 53m 41.9s) |   C |   180 | 17.5 |        
    6736 | 2023-06-18 06:48:32 |             MASTER- | (13h 05m 55.13s , +02d 54m 46.8s) |   C |   180 | 17.5 |        
    7076 | 2023-06-18 06:54:13 |             MASTER- | (13h 05m 49.41s , +02d 53m 36.3s) |   C |   180 | 17.4 |        
Filter C is a clear (unfiltred) band. 


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