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GCN Circular 33942

Subject
LIGO/Virgo S230609a: Global MASTER-Net observations report
Date
2023-06-09T06:42:00Z (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 S230609a errorbox  151 sec after notice time and 195 sec after trigger time at 2023-06-09 01:11:39 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -44.6 deg. 

The galactic latitude b = 78 deg., longitude l = 183 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11978

We obtain a following upper limits.  

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

     215 | 2023-06-09 01:11:39 |         MASTER-OAFA | (11h 58m 05.57s , +32d 24m 15.6s) |   C |    40 | 16.6 |        
     292 | 2023-06-09 01:12:50 |         MASTER-OAFA | (11h 58m 04.99s , +32d 25m 15.2s) |   C |    50 | 16.8 |        
     383 | 2023-06-09 01:14:11 |         MASTER-OAFA | (11h 58m 10.26s , +32d 24m 16.8s) |   C |    70 | 17.3 |        
     494 | 2023-06-09 01:15:53 |         MASTER-OAFA | (11h 58m 05.45s , +32d 23m 17.9s) |   C |    90 | 17.3 |        
     626 | 2023-06-09 01:17:55 |         MASTER-OAFA | (11h 58m 10.81s , +32d 23m 41.5s) |   C |   110 | 17.3 |        
     783 | 2023-06-09 01:20:16 |         MASTER-OAFA | (11h 58m 08.17s , +32d 24m 52.4s) |   C |   140 | 17.3 |        
    9994 | 2023-06-09 03:53:27 |         MASTER-OAFA | (22h 23m 05.32s , -50d 44m 59.6s) |   C |   180 | 17.8 |        
   10205 | 2023-06-09 03:56:58 |         MASTER-OAFA | (22h 35m 39.84s , -50d 43m 47.4s) |   C |   180 | 17.8 |        
   10844 | 2023-06-09 04:07:38 |         MASTER-OAFA | (22h 23m 08.57s , -50d 44m 10.4s) |   C |   180 | 17.9 |        
   11422 | 2023-06-09 04:17:16 |         MASTER-OAFA | (22h 30m 08.47s , -48d 51m 09.1s) |   C |   180 | 17.8 |        
   11634 | 2023-06-09 04:20:48 |         MASTER-OAFA | (22h 40m 55.72s , -48d 50m 33.9s) |   C |   180 | 17.9 |        
   11845 | 2023-06-09 04:24:19 |         MASTER-OAFA | (22h 52m 56.76s , -48d 49m 46.3s) |   C |   180 | 18.2 |        
   12268 | 2023-06-09 04:31:22 |         MASTER-OAFA | (22h 30m 05.37s , -48d 51m 14.3s) |   C |   180 | 17.8 |        
   12480 | 2023-06-09 04:34:54 |         MASTER-OAFA | (22h 41m 01.83s , -48d 51m 14.2s) |   C |   180 | 18.1 |        
   12691 | 2023-06-09 04:38:24 |         MASTER-OAFA | (22h 53m 00.37s , -48d 49m 53.3s) |   C |   180 | 18.1 |        
   12902 | 2023-06-09 04:41:56 |         MASTER-OAFA | (22h 59m 03.30s , -46d 56m 02.6s) |   C |   180 | 18.0 |        
   13113 | 2023-06-09 04:45:27 |         MASTER-OAFA | (23h 10m 33.70s , -46d 56m 54.8s) |   C |   180 | 18.1 |        
   13324 | 2023-06-09 04:48:58 |         MASTER-OAFA | (23h 03m 52.30s , -48d 50m 46.0s) |   C |   180 | 18.3 |        
   13710 | 2023-06-09 04:55:24 |         MASTER-OAFA | (22h 59m 04.16s , -46d 57m 34.5s) |   C |   180 | 18.1 |        
   14072 | 2023-06-09 05:01:26 |         MASTER-OAFA | (23h 03m 50.57s , -48d 51m 28.4s) |   C |   180 | 18.4 |        
   14284 | 2023-06-09 05:04:57 |         MASTER-OAFA | (23h 15m 56.06s , -48d 49m 51.2s) |   C |   180 | 18.1 |        
   14495 | 2023-06-09 05:08:29 |         MASTER-OAFA | (22h 46m 48.83s , -50d 43m 18.7s) |   C |   180 | 18.3 |        
   14707 | 2023-06-09 05:12:00 |         MASTER-OAFA | (22h 59m 25.32s , -50d 44m 30.6s) |   C |   180 | 18.3 |        
   14918 | 2023-06-09 05:15:32 |         MASTER-OAFA | (22h 37m 01.29s , -46d 56m 51.1s) |   C |   180 | 18.1 |        
   15130 | 2023-06-09 05:19:03 |         MASTER-OAFA | (22h 48m 34.40s , -46d 55m 28.0s) |   C |   180 | 18.0 |        
   15341 | 2023-06-09 05:22:34 |         MASTER-OAFA | (22h 46m 52.36s , -50d 44m 46.2s) |   C |   180 | 18.3 |        
   15552 | 2023-06-09 05:26:06 |         MASTER-OAFA | (22h 59m 26.25s , -50d 43m 53.7s) |   C |   180 | 18.4 |        
   15868 | 2023-06-09 05:31:21 |         MASTER-OAFA | (22h 48m 32.01s , -46d 55m 10.5s) |   C |   180 | 18.2 |        
   16080 | 2023-06-09 05:34:53 |         MASTER-OAFA | (22h 34m 42.25s , -41d 14m 52.3s) |   C |   180 | 17.6 |        
   16291 | 2023-06-09 05:38:24 |         MASTER-OAFA | (22h 45m 22.09s , -41d 14m 55.5s) |   C |   180 | 17.6 |        
   16502 | 2023-06-09 05:41:56 |         MASTER-OAFA | (22h 02m 28.59s , -37d 25m 54.6s) |   C |   180 | 17.7 |        
   16942 | 2023-06-09 05:49:15 |         MASTER-OAFA | (22h 34m 43.28s , -41d 13m 46.4s) |   C |   180 | 17.5 |        
   17153 | 2023-06-09 05:52:47 |         MASTER-OAFA | (22h 45m 15.79s , -41d 12m 56.2s) |   C |   180 | 17.6 |        
   17364 | 2023-06-09 05:56:18 |         MASTER-OAFA | (22h 02m 32.07s , -37d 25m 06.0s) |   C |   180 | 17.5 |        
   17575 | 2023-06-09 05:59:49 |         MASTER-OAFA | (22h 12m 26.75s , -37d 26m 18.4s) |   C |   180 | 17.5 |        
   17787 | 2023-06-09 06:03:20 |         MASTER-OAFA | (21h 49m 39.75s , -35d 30m 14.7s) |   C |   180 | 17.6 |        
   17997 | 2023-06-09 06:06:51 |         MASTER-OAFA | (21h 59m 25.79s , -35d 31m 49.2s) |   C |   180 | 17.5 |        
   18209 | 2023-06-09 06:10:22 |         MASTER-OAFA | (21h 43m 26.57s , -37d 24m 40.9s) |   C |   180 | 17.7 |        
   18622 | 2023-06-09 06:17:16 |         MASTER-OAFA | (21h 49m 42.37s , -35d 30m 45.7s) |   C |   180 | 17.6 |        
   18834 | 2023-06-09 06:20:47 |         MASTER-OAFA | (21h 59m 22.80s , -35d 31m 56.5s) |   C |   180 | 17.6 |        
   19465 | 2023-06-09 06:31:18 |         MASTER-OAFA | (21h 58m 01.03s , -39d 17m 57.1s) |   C |   180 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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


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