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GCN Circular 33849

Subject
LIGO/Virgo S230521k: Global MASTER-Net observations report
Date
2023-05-22T06:24:36Z (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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230521k errorbox 27825 sec after trigger time at 2023-05-21 13:14:28 UT, with upper limit up to  17.3 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -14.0 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230521k errorbox 40364 sec after trigger time at 2023-05-21 16:43:27 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 43 deg. The sun  altitude  is -12.2 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230521k errorbox 62011 sec after trigger time at 2023-05-21 22:44:14 UT, with upper limit up to  17.6 mag. Observations started at twilight.  The observations began at zenith distance = 22 deg. The sun  altitude  is -12.9 deg. 

The galactic latitude b = -49 deg., longitude l = 208 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11874

We obtain a following upper limits.  

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

   27856 | 2023-05-21 13:14:28 |         MASTER-Amur | (05h 16m 51.62s , +79d 09m 34.2s) |   C |    60 | 17.0 |        
   27948 | 2023-05-21 13:16:01 |         MASTER-Amur | (05h 58m 39.99s , +79d 09m 12.5s) |   C |    60 | 16.9 |        
   28226 | 2023-05-21 13:20:38 |         MASTER-Amur | (05h 16m 51.13s , +79d 10m 54.0s) |   C |    60 | 17.0 |        
   28318 | 2023-05-21 13:22:11 |         MASTER-Amur | (05h 58m 42.66s , +79d 09m 35.7s) |   C |    60 | 17.0 |        
   28596 | 2023-05-21 13:26:49 |         MASTER-Amur | (05h 17m 00.94s , +79d 10m 40.8s) |   C |    60 | 17.1 |        
   28689 | 2023-05-21 13:28:21 |         MASTER-Amur | (05h 58m 50.00s , +79d 09m 27.3s) |   C |    60 | 17.1 |        
   28782 | 2023-05-21 13:29:54 |         MASTER-Amur | (03h 57m 11.24s , +79d 16m 57.1s) |   C |    60 | 17.1 |        
   28874 | 2023-05-21 13:31:26 |         MASTER-Amur | (04h 39m 13.24s , +79d 13m 50.0s) |   C |    60 | 17.2 |        
   28966 | 2023-05-21 13:32:59 |         MASTER-Amur | (04h 23m 33.68s , +73d 32m 50.4s) |   C |    60 | 16.9 |        
   29059 | 2023-05-21 13:34:31 |         MASTER-Amur | (04h 51m 21.32s , +73d 30m 10.9s) |   C |    60 | 17.0 |        
   29152 | 2023-05-21 13:36:04 |         MASTER-Amur | (03h 57m 11.88s , +79d 15m 51.5s) |   C |    60 | 17.1 |        
   29244 | 2023-05-21 13:37:37 |         MASTER-Amur | (04h 39m 21.54s , +79d 14m 59.3s) |   C |    60 | 17.3 |        
   29337 | 2023-05-21 13:39:09 |         MASTER-Amur | (04h 23m 31.37s , +73d 32m 22.5s) |   C |    60 | 17.0 |        
   29429 | 2023-05-21 13:40:42 |         MASTER-Amur | (04h 51m 29.46s , +73d 32m 16.9s) |   C |    60 | 17.0 |        
   29614 | 2023-05-21 13:43:46 |         MASTER-Amur | (04h 39m 21.10s , +79d 15m 35.2s) |   C |    60 | 17.3 |        
   29706 | 2023-05-21 13:45:19 |         MASTER-Amur | (04h 23m 36.18s , +73d 33m 35.9s) |   C |    60 | 17.0 |        
   29799 | 2023-05-21 13:46:51 |         MASTER-Amur | (04h 51m 25.07s , +73d 30m 56.3s) |   C |    60 | 16.9 |        
   40149 | 2023-05-21 16:38:22 |         MASTER-Amur | (02h 10m 05.21s , +37d 24m 21.1s) |   C |   180 | 13.8 |        
   40454 | 2023-05-21 16:43:27 |         MASTER-SAAO | (06h 48m 54.11s , -23d 27m 13.1s) |   C |   180 | 16.9 |        
   40454 | 2023-05-21 16:43:27 |         MASTER-SAAO | (06h 49m 48.06s , -23d 27m 33.7s) |   C |   180 | 16.9 |        
   40666 | 2023-05-21 16:46:58 |         MASTER-SAAO | (06h 57m 40.41s , -23d 25m 39.2s) |   C |   180 | 17.9 |        
   40666 | 2023-05-21 16:46:58 |         MASTER-SAAO | (06h 58m 34.32s , -23d 25m 59.9s) |   C |   180 | 17.9 |        
   41459 | 2023-05-21 17:00:12 |         MASTER-SAAO | (06h 48m 53.99s , -23d 26m 32.0s) |   C |   180 | 18.6 |        
   41459 | 2023-05-21 17:00:12 |         MASTER-SAAO | (06h 49m 47.04s , -23d 26m 55.3s) |   C |   180 | 18.6 |        
   41659 | 2023-05-21 17:03:32 |         MASTER-SAAO | (06h 57m 35.46s , -23d 25m 04.7s) |   C |   180 | 17.9 |        
   41659 | 2023-05-21 17:03:32 |         MASTER-SAAO | (06h 58m 28.60s , -23d 25m 28.6s) |   C |   180 | 18.0 |        
   41870 | 2023-05-21 17:07:03 |         MASTER-SAAO | (06h 26m 51.52s , -21d 30m 59.3s) |   C |   180 | 15.9 |        
   41870 | 2023-05-21 17:07:03 |         MASTER-SAAO | (06h 27m 43.67s , -21d 31m 23.1s) |   C |   180 | 16.0 |        
   41889 | 2023-05-21 17:07:22 |         MASTER-Amur | (02h 06m 58.70s , +35d 30m 02.6s) |   C |   180 | 15.7 |        
   42082 | 2023-05-21 17:10:34 |         MASTER-SAAO | (06h 35m 22.00s , -21d 31m 29.0s) |   C |   180 | 16.3 |        
   42082 | 2023-05-21 17:10:34 |         MASTER-SAAO | (06h 36m 14.42s , -21d 31m 51.9s) |   C |   180 | 16.4 |        
   42102 | 2023-05-21 17:10:54 |         MASTER-Amur | (02h 04m 11.90s , +33d 37m 56.1s) |   C |   180 | 15.6 |        
   42293 | 2023-05-21 17:14:06 |         MASTER-SAAO | (06h 22m 52.17s , -19d 37m 43.5s) |   C |   180 | 14.8 |        
   42293 | 2023-05-21 17:14:06 |         MASTER-SAAO | (06h 22m 00.55s , -19d 37m 20.1s) |   C |   180 | 14.8 |        
   42315 | 2023-05-21 17:14:27 |         MASTER-Amur | (01h 09m 27.15s , +33d 36m 33.2s) |   C |   180 | 17.0 |        
   42505 | 2023-05-21 17:17:38 |         MASTER-SAAO | (06h 30m 24.34s , -19d 38m 13.1s) |   C |   180 | 16.1 |        
   42505 | 2023-05-21 17:17:38 |         MASTER-SAAO | (06h 31m 16.05s , -19d 38m 35.3s) |   C |   180 | 16.0 |        
   42527 | 2023-05-21 17:17:59 |         MASTER-Amur | (01h 19m 00.90s , +33d 37m 40.4s) |   C |   180 | 16.7 |        
   42716 | 2023-05-21 17:21:09 |         MASTER-SAAO | (06h 26m 51.61s , -21d 31m 47.3s) |   C |   180 | 18.0 |        
   42716 | 2023-05-21 17:21:09 |         MASTER-SAAO | (06h 27m 43.67s , -21d 32m 10.0s) |   C |   180 | 18.0 |        
   42927 | 2023-05-21 17:24:40 |         MASTER-SAAO | (06h 35m 24.28s , -21d 30m 07.4s) |   C |   180 | 18.8 |        
   42927 | 2023-05-21 17:24:40 |         MASTER-SAAO | (06h 36m 16.24s , -21d 30m 30.7s) |   C |   180 | 18.7 |        
   42993 | 2023-05-21 17:25:46 |         MASTER-Amur | (02h 01m 42.41s , +31d 42m 14.7s) |   C |   180 | 15.6 |        
   43139 | 2023-05-21 17:28:11 |         MASTER-SAAO | (06h 21m 58.47s , -19d 37m 36.1s) |   C |   180 | 17.8 |        
   43139 | 2023-05-21 17:28:11 |         MASTER-SAAO | (06h 22m 49.47s , -19d 37m 59.6s) |   C |   180 | 17.9 |        
   43206 | 2023-05-21 17:29:18 |         MASTER-Amur | (01h 09m 26.22s , +33d 36m 20.9s) |   C |   180 | 17.1 |        
   43351 | 2023-05-21 17:31:43 |         MASTER-SAAO | (06h 30m 31.97s , -19d 35m 53.9s) |   C |   180 | 18.0 |        
   43351 | 2023-05-21 17:31:43 |         MASTER-SAAO | (06h 31m 22.88s , -19d 36m 17.9s) |   C |   180 | 18.0 |        
   43562 | 2023-05-21 17:35:15 |         MASTER-SAAO | (06h 17m 39.15s , -17d 41m 33.1s) |   C |   180 | 17.2 |        
   43562 | 2023-05-21 17:35:15 |         MASTER-SAAO | (06h 18m 28.85s , -17d 41m 55.5s) |   C |   180 | 17.5 |        
   43774 | 2023-05-21 17:38:46 |         MASTER-SAAO | (06h 26m 08.53s , -17d 42m 25.2s) |   C |   180 | 18.3 |        
   43774 | 2023-05-21 17:38:46 |         MASTER-SAAO | (06h 26m 58.19s , -17d 42m 47.2s) |   C |   180 | 18.4 |        
   43985 | 2023-05-21 17:42:18 |         MASTER-SAAO | (06h 33m 41.65s , -17d 43m 16.4s) |   C |   180 | 18.3 |        
   43985 | 2023-05-21 17:42:18 |         MASTER-SAAO | (06h 34m 31.33s , -17d 43m 38.4s) |   C |   180 | 18.3 |        
   44197 | 2023-05-21 17:45:50 |         MASTER-SAAO | (06h 38m 11.33s , -25d 18m 49.8s) |   C |   180 | 18.7 |        
   44197 | 2023-05-21 17:45:50 |         MASTER-SAAO | (06h 39m 03.83s , -25d 19m 12.2s) |   C |   180 | 18.6 |        
   44408 | 2023-05-21 17:49:21 |         MASTER-SAAO | (06h 42m 06.33s , -17d 41m 17.3s) |   C |   180 | 18.6 |        
   44408 | 2023-05-21 17:49:21 |         MASTER-SAAO | (06h 42m 55.91s , -17d 41m 40.2s) |   C |   180 | 18.5 |        
   44620 | 2023-05-21 17:52:52 |         MASTER-SAAO | (06h 17m 45.89s , -17d 42m 04.2s) |   C |   180 | 15.9 |        
   44620 | 2023-05-21 17:52:52 |         MASTER-SAAO | (06h 18m 35.18s , -17d 42m 24.6s) |   C |   180 | 15.9 |        
   44786 | 2023-05-21 17:55:38 |         MASTER-Amur | (01h 18m 55.53s , +33d 37m 43.3s) |   C |   180 | 16.3 |        
   44831 | 2023-05-21 17:56:24 |         MASTER-SAAO | (06h 47m 00.40s , -25d 17m 00.9s) |   C |   180 | 17.5 |        
   44831 | 2023-05-21 17:56:24 |         MASTER-SAAO | (06h 47m 53.06s , -25d 17m 19.3s) |   C |   180 | 17.5 |        
   44998 | 2023-05-21 17:59:11 |         MASTER-Amur | (02h 01m 40.50s , +31d 42m 16.9s) |   C |   180 | 14.6 |        
   45043 | 2023-05-21 17:59:55 |         MASTER-SAAO | (06h 26m 14.74s , -17d 41m 51.2s) |   C |   180 | 16.4 |        
   45043 | 2023-05-21 17:59:55 |         MASTER-SAAO | (06h 27m 04.14s , -17d 42m 09.5s) |   C |   180 | 16.5 |        
   45254 | 2023-05-21 18:03:27 |         MASTER-SAAO | (06h 33m 41.02s , -17d 42m 41.9s) |   C |   180 | 17.5 |        
   45254 | 2023-05-21 18:03:27 |         MASTER-SAAO | (06h 34m 30.36s , -17d 43m 00.0s) |   C |   180 | 17.7 |        
   45424 | 2023-05-21 18:06:16 |         MASTER-Amur | (00h 58m 28.35s , +29d 49m 36.4s) |   C |   180 | 15.8 |        
   45466 | 2023-05-21 18:06:59 |         MASTER-SAAO | (06h 38m 15.58s , -25d 18m 38.9s) |   C |   180 | 18.4 |        
   45466 | 2023-05-21 18:06:59 |         MASTER-SAAO | (06h 39m 07.70s , -25d 18m 57.2s) |   C |   180 | 18.4 |        
   45678 | 2023-05-21 18:10:30 |         MASTER-SAAO | (06h 42m 07.63s , -17d 40m 48.9s) |   C |   180 | 16.4 |        
   45678 | 2023-05-21 18:10:30 |         MASTER-SAAO | (06h 42m 56.97s , -17d 41m 07.6s) |   C |   180 | 16.3 |        
   45890 | 2023-05-21 18:14:02 |         MASTER-SAAO | (06h 47m 03.57s , -25d 18m 02.0s) |   C |   180 | 12.9 |        
   45890 | 2023-05-21 18:14:02 |         MASTER-SAAO | (06h 47m 56.19s , -25d 18m 19.7s) |   C |   180 | 12.6 |        
   46101 | 2023-05-21 18:17:33 |         MASTER-SAAO | (06h 38m 12.01s , -19d 35m 21.0s) |   C |   180 | 15.5 |        
   46101 | 2023-05-21 18:17:33 |         MASTER-SAAO | (06h 39m 02.34s , -19d 35m 37.4s) |   C |   180 | 15.7 |        
   46312 | 2023-05-21 18:21:05 |         MASTER-SAAO | (06h 46m 38.41s , -19d 34m 13.5s) |   C |   180 | 16.5 |        
   46312 | 2023-05-21 18:21:05 |         MASTER-SAAO | (06h 47m 28.72s , -19d 34m 29.8s) |   C |   180 | 16.6 |        
   46524 | 2023-05-21 18:24:37 |         MASTER-SAAO | (06h 29m 59.55s , -15d 48m 07.5s) |   C |   180 | 14.1 |        
   46524 | 2023-05-21 18:24:37 |         MASTER-SAAO | (06h 30m 48.27s , -15d 48m 23.0s) |   C |   180 | 14.6 |        
   46735 | 2023-05-21 18:28:08 |         MASTER-SAAO | (07h 00m 11.95s , -30d 58m 21.0s) |   C |   180 | 15.3 |        
   46735 | 2023-05-21 18:28:08 |         MASTER-SAAO | (07h 01m 07.76s , -30d 58m 35.3s) |   C |   180 | 15.1 |        
   46946 | 2023-05-21 18:31:39 |         MASTER-SAAO | (06h 39m 09.39s , -15d 47m 57.7s) |   C |   180 | 12.9 |        
   47370 | 2023-05-21 18:38:43 |         MASTER-SAAO | (07h 09m 30.09s , -30d 58m 51.6s) |   C |   180 | 12.8 |        
   47370 | 2023-05-21 18:38:43 |         MASTER-SAAO | (07h 10m 25.96s , -30d 59m 05.0s) |   C |   180 | 12.7 |        
   47583 | 2023-05-21 18:42:15 |         MASTER-SAAO | (06h 46m 48.88s , -19d 33m 36.9s) |   C |   180 | 12.5 |        
   47583 | 2023-05-21 18:42:15 |         MASTER-SAAO | (06h 47m 38.92s , -19d 33m 50.7s) |   C |   180 | 12.7 |        
   48005 | 2023-05-21 18:49:18 |         MASTER-SAAO | (07h 00m 09.31s , -30d 59m 36.1s) |   C |   180 | 12.6 |        
   48005 | 2023-05-21 18:49:18 |         MASTER-SAAO | (07h 01m 04.71s , -30d 59m 47.9s) |   C |   180 | 12.5 |        
   49062 | 2023-05-21 19:06:54 |         MASTER-SAAO | (06h 55m 17.36s , -25d 16m 02.4s) |   C |   180 | 14.2 |        
   49062 | 2023-05-21 19:06:54 |         MASTER-SAAO | (06h 56m 09.44s , -25d 16m 15.4s) |   C |   180 | 14.5 |        
   49696 | 2023-05-21 19:17:28 |         MASTER-SAAO | (06h 54m 04.28s , -27d 08m 59.0s) |   C |   180 | 14.6 |        
   49696 | 2023-05-21 19:17:28 |         MASTER-SAAO | (06h 54m 56.79s , -27d 09m 11.6s) |   C |   180 | 15.0 |        
   49906 | 2023-05-21 19:20:59 |         MASTER-SAAO | (06h 55m 21.35s , -25d 16m 21.8s) |   C |   180 | 12.5 |        
   49906 | 2023-05-21 19:20:59 |         MASTER-SAAO | (06h 56m 12.74s , -25d 16m 35.3s) |   C |   180 | 14.0 |        
   50865 | 2023-05-21 19:36:58 |         MASTER-SAAO | (07h 00m 22.45s , -34d 46m 05.4s) |   C |   180 | 15.4 |        
   50865 | 2023-05-21 19:36:58 |         MASTER-SAAO | (07h 01m 19.73s , -34d 46m 14.6s) |   C |   180 | 15.6 |        
   51181 | 2023-05-21 19:42:13 |         MASTER-SAAO | (07h 10m 03.83s , -34d 45m 12.5s) |   C |   180 | 15.9 |        
   51181 | 2023-05-21 19:42:13 |         MASTER-SAAO | (07h 11m 00.94s , -34d 45m 19.3s) |   C |   180 | 16.0 |        
   51916 | 2023-05-21 19:54:28 |         MASTER-SAAO | (07h 00m 31.27s , -34d 45m 43.8s) |   C |   180 | 14.2 |        
   51916 | 2023-05-21 19:54:28 |         MASTER-SAAO | (07h 01m 27.95s , -34d 45m 50.1s) |   C |   180 | 14.4 |        
   52230 | 2023-05-21 19:59:43 |         MASTER-SAAO | (07h 10m 11.06s , -34d 45m 33.0s) |   C |   180 | 14.6 |        
   52230 | 2023-05-21 19:59:43 |         MASTER-SAAO | (07h 11m 07.82s , -34d 45m 38.7s) |   C |   180 | 14.7 |        
   62101 | 2023-05-21 22:44:14 |         MASTER-OAFA | (08h 35m 34.70s , -43d 48m 12.2s) |   C |   180 | 17.6 |        
   63185 | 2023-05-21 23:02:18 |         MASTER-OAFA | (08h 35m 32.65s , -42d 30m 54.4s) |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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


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