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GCN Circular 33865

Subject
LIGO/Virgo S230524b: Global MASTER-Net observations report
Date
2023-05-24T06:24:26Z (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 S230524b errorbox  60 sec after notice time and 95 sec after trigger time at 2023-05-24 06:14:55 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -64.6 deg. 

The galactic latitude b = 44 deg., longitude l = 50 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11887

We obtain a following upper limits.  

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

     106 | 2023-05-24 06:14:55 |         MASTER-OAFA | (16h 16m 46.14s , +31d 07m 13.6s) |   C |    20 | 17.5 |        
     150 | 2023-05-24 06:15:35 |         MASTER-OAFA | (16h 16m 39.33s , +31d 06m 12.3s) |   C |    30 | 17.7 |        
     205 | 2023-05-24 06:16:24 |         MASTER-OAFA | (16h 16m 46.20s , +31d 06m 32.0s) |   C |    40 | 17.9 |        
     269 | 2023-05-24 06:17:24 |         MASTER-OAFA | (16h 16m 42.25s , +31d 07m 41.7s) |   C |    50 | 18.1 |        
     344 | 2023-05-24 06:18:33 |         MASTER-OAFA | (16h 16m 42.25s , +31d 06m 08.2s) |   C |    60 | 18.3 |        
Filter C is a clear (unfiltred) band. 


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


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