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GCN Circular 34093

Subject
LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report
Date
2023-06-27T16:38:53Z (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-OAGH robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the LIGO/Virgo/KAGRA S230627c errorbox  15958 sec after notice time and 16028 sec after trigger time at 2023-06-27 06:20:45 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -33.7 deg. 

The galactic latitude b = 58 deg., longitude l = 164 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12441

We obtain a following upper limits.  

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

   16119 | 2023-06-27 06:20:45 |         MASTER-OAGH | (00h 15m 44.99s , +70d 00m 53.5s) |   C |   180 | 15.8 |        
   16318 | 2023-06-27 06:24:05 |         MASTER-OAGH | (00h 13m 10.67s , +64d 20m 45.1s) |   C |   180 | 15.8 |        
   17118 | 2023-06-27 06:37:25 |         MASTER-OAGH | (00h 12m 19.27s , +62d 26m 22.0s) |   C |   180 | 16.4 |        
   17319 | 2023-06-27 06:40:45 |         MASTER-OAGH | (00h 15m 43.95s , +70d 03m 59.5s) |   C |   180 | 15.2 |        
   17519 | 2023-06-27 06:44:06 |         MASTER-OAGH | (00h 13m 06.38s , +64d 21m 14.6s) |   C |   180 | 16.2 |        
   19098 | 2023-06-27 07:10:25 |         MASTER-OAGH | (00h 12m 13.26s , +62d 29m 06.9s) |   C |   180 | 15.3 |        
Filter C is a clear (unfiltred) band. 


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