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GCN Circular 33977

Subject
LIGO/Virgo S230615be: Global MASTER-Net observations report
Date
2023-06-16T06:55:36Z (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-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 S230615be errorbox  40028 sec after notice time and 40102 sec after trigger time at 2023-06-16 05:08:48 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 58 deg. The sun  altitude  is -79.3 deg. 

The galactic latitude b = 61 deg., longitude l = 124 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12056

We obtain a following upper limits.  

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

   40192 | 2023-06-16 05:08:48 |         MASTER-OAFA | (13h 10m 19.93s , -47d 33m 23.2s) |   C |   180 | 18.7 |        
   40425 | 2023-06-16 05:12:41 |         MASTER-OAFA | (13h 22m 21.51s , -47d 31m 52.1s) |   C |   180 | 18.5 |        
   41121 | 2023-06-16 05:24:16 |         MASTER-OAFA | (13h 10m 22.94s , -47d 32m 54.0s) |   C |   180 | 18.7 |        
   41584 | 2023-06-16 05:31:59 |         MASTER-OAFA | (13h 22m 17.37s , -47d 32m 19.2s) |   C |   180 | 18.4 |        
   43011 | 2023-06-16 05:55:47 |         MASTER-OAFA | (13h 36m 49.46s , -53d 15m 59.2s) |   C |   180 | 18.1 |        
   43492 | 2023-06-16 06:03:48 |         MASTER-OAFA | (13h 26m 15.43s , -51d 22m 26.9s) |   C |   180 | 18.4 |        
   43755 | 2023-06-16 06:08:10 |         MASTER-OAFA | (13h 17m 31.84s , -49d 28m 13.6s) |   C |   180 | 18.3 |        
   44082 | 2023-06-16 06:13:37 |         MASTER-OAFA | (13h 29m 55.36s , -49d 26m 35.1s) |   C |   180 | 18.3 |        
   44313 | 2023-06-16 06:17:29 |         MASTER-OAFA | (13h 26m 20.02s , -51d 21m 33.4s) |   C |   180 | 18.2 |        
   44757 | 2023-06-16 06:24:52 |         MASTER-OAFA | (13h 17m 33.10s , -49d 28m 35.4s) |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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