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GCN Circular 33817

Subject
LIGO/Virgo S230518h: Global MASTER-Net observations report
Date
2023-05-18T18:28:23Z (2 years 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 S230518h errorbox  192 sec after notice time and 10188 sec after trigger time at 2023-05-18 15:48:56 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -20.3 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230518h errorbox  3191 sec after notice time and 13187 sec after trigger time at 2023-05-18 16:38:55 UT, with upper limit up to  17.7 mag. Observations started at twilight.  The observations began at zenith distance = 43 deg. The sun  altitude  is -11.0 deg. 

The galactic latitude b = -11 deg., longitude l = 223 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11865

We obtain a following upper limits.  

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

   10278 | 2023-05-18 15:48:56 |         MASTER-Amur | (23h 42m 34.05s , +27d 56m 23.2s) |   C |   180 | 16.4 |        
   10486 | 2023-05-18 15:52:23 |         MASTER-Amur | (23h 36m 00.68s , +26d 00m 33.9s) |   C |   180 | 16.5 |        
   10686 | 2023-05-18 15:55:44 |         MASTER-Amur | (23h 56m 30.29s , +27d 55m 52.4s) |   C |   180 | 15.6 |        
   11213 | 2023-05-18 16:04:31 |         MASTER-Amur | (00h 13m 40.72s , +29d 50m 21.9s) |   C |   180 | 15.3 |        
   11413 | 2023-05-18 16:07:51 |         MASTER-Amur | (23h 55m 58.92s , +31d 42m 40.7s) |   C |   180 | 17.0 |        
   11647 | 2023-05-18 16:11:44 |         MASTER-Amur | (00h 05m 25.45s , +31d 43m 52.8s) |   C |   180 | 16.6 |        
   12170 | 2023-05-18 16:20:28 |         MASTER-Amur | (23h 56m 00.17s , +31d 44m 12.4s) |   C |   180 | 16.8 |        
   12370 | 2023-05-18 16:23:48 |         MASTER-Amur | (00h 05m 18.97s , +31d 43m 14.6s) |   C |   180 | 16.9 |        
   12571 | 2023-05-18 16:27:08 |         MASTER-Amur | (23h 25m 22.89s , +27d 54m 58.8s) |   C |   180 | 17.5 |        
   12770 | 2023-05-18 16:30:28 |         MASTER-Amur | (23h 34m 20.58s , +27d 54m 00.4s) |   C |   180 | 17.3 |        
   12970 | 2023-05-18 16:33:47 |         MASTER-Amur | (23h 18m 57.17s , +26d 01m 19.5s) |   C |   180 | 17.5 |        
   13170 | 2023-05-18 16:37:07 |         MASTER-Amur | (23h 27m 50.84s , +25d 59m 52.3s) |   C |   180 | 17.4 |        
   13278 | 2023-05-18 16:38:55 |         MASTER-SAAO | (06h 32m 29.44s , -23d 26m 27.9s) |   C |   180 | 17.3 |        
   13278 | 2023-05-18 16:38:55 |         MASTER-SAAO | (06h 33m 19.54s , -23d 26m 52.9s) |   C |   180 | 17.4 |        
   13370 | 2023-05-18 16:40:27 |         MASTER-Amur | (23h 25m 21.09s , +27d 55m 38.3s) |   C |   180 | 17.5 |        
   13489 | 2023-05-18 16:42:27 |         MASTER-SAAO | (06h 41m 06.20s , -23d 27m 07.7s) |   C |   180 | 15.8 |        
   13489 | 2023-05-18 16:42:27 |         MASTER-SAAO | (06h 41m 56.73s , -23d 27m 32.5s) |   C |   180 | 15.7 |        
   13569 | 2023-05-18 16:43:47 |         MASTER-Amur | (23h 34m 18.00s , +27d 54m 49.9s) |   C |   180 | 17.5 |        
   13689 | 2023-05-18 16:45:47 |         MASTER-SAAO | (06h 26m 56.44s , -21d 32m 00.9s) |   C |   180 | 15.9 |        
   13689 | 2023-05-18 16:45:47 |         MASTER-SAAO | (06h 27m 46.21s , -21d 32m 26.0s) |   C |   180 | 15.9 |        
   13769 | 2023-05-18 16:47:06 |         MASTER-Amur | (23h 18m 51.54s , +26d 01m 33.5s) |   C |   180 | 17.7 |        
   13901 | 2023-05-18 16:49:18 |         MASTER-SAAO | (06h 35m 40.83s , -21d 32m 55.8s) |   C |   180 | 17.7 |        
   13901 | 2023-05-18 16:49:18 |         MASTER-SAAO | (06h 36m 30.85s , -21d 33m 20.5s) |   C |   180 | 17.7 |        
   13968 | 2023-05-18 16:50:26 |         MASTER-Amur | (23h 27m 53.06s , +26d 00m 39.5s) |   C |   180 | 17.6 |        
   14112 | 2023-05-18 16:52:49 |         MASTER-SAAO | (06h 22m 09.91s , -19d 39m 15.3s) |   C |   180 | 15.3 |        
   14112 | 2023-05-18 16:52:49 |         MASTER-SAAO | (06h 22m 59.36s , -19d 39m 40.9s) |   C |   180 | 15.4 |        
   14168 | 2023-05-18 16:53:46 |         MASTER-Amur | (23h 26m 09.80s , +20d 17m 47.3s) |   C |   180 | 17.5 |        
   14569 | 2023-05-18 17:00:26 |         MASTER-Amur | (23h 27m 45.99s , +22d 13m 09.2s) |   C |   180 | 17.4 |        
   14769 | 2023-05-18 17:03:46 |         MASTER-Amur | (23h 36m 17.86s , +22d 12m 37.0s) |   C |   180 | 17.4 |        
   14969 | 2023-05-18 17:07:06 |         MASTER-Amur | (23h 26m 03.47s , +20d 19m 20.5s) |   C |   180 | 17.4 |        
   15391 | 2023-05-18 17:14:09 |         MASTER-Amur | (23h 27m 38.02s , +22d 11m 11.9s) |   C |   180 | 17.5 |        
   15591 | 2023-05-18 17:17:28 |         MASTER-Amur | (23h 36m 21.64s , +22d 11m 45.9s) |   C |   180 | 17.4 |        
   15791 | 2023-05-18 17:20:48 |         MASTER-Amur | (23h 30m 53.60s , +24d 05m 24.2s) |   C |   180 | 17.6 |        
   15991 | 2023-05-18 17:24:08 |         MASTER-Amur | (23h 39m 42.89s , +24d 07m 13.7s) |   C |   180 | 17.6 |        
   16190 | 2023-05-18 17:27:28 |         MASTER-Amur | (00h 13m 23.27s , +27d 55m 46.2s) |   C |   180 | 17.0 |        
   16390 | 2023-05-18 17:30:47 |         MASTER-Amur | (00h 22m 34.20s , +27d 54m 50.2s) |   C |   180 | 16.8 |        
   16789 | 2023-05-18 17:37:26 |         MASTER-Amur | (00h 04m 00.08s , +27d 48m 45.4s) |   C |   180 | 16.8 |        
   16989 | 2023-05-18 17:40:46 |         MASTER-Amur | (00h 03m 57.56s , +27d 50m 06.1s) |   C |   180 | 16.8 |        
   17189 | 2023-05-18 17:44:06 |         MASTER-Amur | (00h 03m 57.25s , +27d 48m 30.8s) |   C |   180 | 16.7 |        
   17875 | 2023-05-18 17:55:33 |         MASTER-Amur | (23h 30m 51.84s , +24d 05m 05.7s) |   C |   180 | 16.9 |        
   18075 | 2023-05-18 17:58:52 |         MASTER-Amur | (23h 39m 33.41s , +24d 04m 17.8s) |   C |   180 | 16.6 |        
   18280 | 2023-05-18 18:02:18 |         MASTER-Amur | (00h 13m 26.48s , +27d 53m 29.6s) |   C |   180 | 15.9 |        
   18480 | 2023-05-18 18:05:37 |         MASTER-Amur | (00h 22m 26.18s , +27d 54m 42.7s) |   C |   180 | 15.8 |        
   18679 | 2023-05-18 18:08:57 |         MASTER-Amur | (23h 55m 59.05s , +29d 47m 58.1s) |   C |   180 | 16.0 |        
   18879 | 2023-05-18 18:12:17 |         MASTER-Amur | (00h 05m 53.80s , +29d 47m 33.9s) |   C |   180 | 15.8 |        
Filter C is a clear (unfiltred) band. 


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