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GCN Circular 33997

Subject
LIGO/Virgo S230617bc: Global MASTER-Net observations report
Date
2023-06-18T07:06:21Z (8 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 S230617bc errorbox  1260 sec after notice time and 1344 sec after trigger time at 2023-06-17 22:38:31 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 67 deg. The sun  altitude  is -12.4 deg. 

The galactic latitude b = 69 deg., longitude l = 128 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12086

We obtain a following upper limits.  

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

    1434 | 2023-06-17 22:38:31 |         MASTER-OAFA | (09h 40m 44.63s , +29d 17m 30.6s) |   C |   180 | 16.5 |        
    1647 | 2023-06-17 22:42:04 |         MASTER-OAFA | (09h 38m 24.12s , +27d 22m 04.5s) |   C |   180 | 17.3 |        
    1859 | 2023-06-17 22:45:35 |         MASTER-OAFA | (09h 47m 30.89s , +27d 23m 52.5s) |   C |   180 | 17.9 |        
    2070 | 2023-06-17 22:49:06 |         MASTER-OAFA | (09h 31m 28.86s , +29d 16m 32.7s) |   C |   180 | 17.8 |        
    2281 | 2023-06-17 22:52:38 |         MASTER-OAFA | (09h 40m 42.07s , +29d 17m 47.3s) |   C |   180 | 18.1 |        
    2492 | 2023-06-17 22:56:08 |         MASTER-OAFA | (09h 48m 58.77s , +29d 16m 00.9s) |   C |   180 | 18.5 |        
    2704 | 2023-06-17 22:59:40 |         MASTER-OAFA | (09h 58m 18.13s , +29d 16m 46.7s) |   C |   180 | 18.8 |        
    2935 | 2023-06-17 23:03:32 |         MASTER-OAFA | (07h 32m 42.28s , -15d 20m 46.5s) |   C |   180 | 17.6 |        
    3293 | 2023-06-17 23:09:30 |         MASTER-OAFA | (09h 48m 22.99s , +30d 20m 02.2s) |   C |   180 | 18.3 |        
    3504 | 2023-06-17 23:13:01 |         MASTER-OAFA | (09h 57m 36.61s , +30d 21m 20.4s) |   C |   180 | 18.7 |        
    3885 | 2023-06-17 23:19:21 |         MASTER-OAFA | (07h 40m 56.59s , -15d 21m 01.3s) |   C |   180 | 18.3 |        
    4096 | 2023-06-17 23:22:53 |         MASTER-OAFA | (07h 42m 28.65s , -19d 07m 22.9s) |   C |   180 | 18.4 |        
    4307 | 2023-06-17 23:26:24 |         MASTER-OAFA | (07h 50m 58.57s , -19d 08m 19.7s) |   C |   180 | 18.4 |        
    4778 | 2023-06-17 23:34:15 |         MASTER-OAFA | (07h 59m 55.45s , -13d 26m 26.6s) |   C |   180 | 18.4 |        
    5154 | 2023-06-17 23:40:30 |         MASTER-OAFA | (07h 42m 27.95s , -19d 07m 24.1s) |   C |   180 | 18.2 |        
    5365 | 2023-06-17 23:44:02 |         MASTER-OAFA | (08h 08m 12.21s , -13d 25m 58.3s) |   C |   180 | 18.6 |        
    5682 | 2023-06-17 23:49:19 |         MASTER-OAFA | (08h 08m 30.61s , -09d 37m 20.7s) |   C |   180 | 18.6 |        
    6164 | 2023-06-17 23:57:20 |         MASTER-OAFA | (08h 16m 43.79s , -09d 37m 00.7s) |   C |   180 | 18.5 |        
    6375 | 2023-06-18 00:00:52 |         MASTER-OAFA | (07h 59m 53.43s , -13d 26m 39.4s) |   C |   180 | 18.3 |        
    6586 | 2023-06-18 00:04:23 |         MASTER-OAFA | (08h 08m 14.68s , -13d 25m 58.9s) |   C |   180 | 18.4 |        
   17872 | 2023-06-18 03:12:29 |             MASTER- | (11h 08m 29.72s , +42d 44m 32.7s) |   C |   180 | 12.5 |        
   18214 | 2023-06-18 03:18:11 |             MASTER- | (10h 20m 42.13s , +38d 53m 10.8s) |   C |   180 | 12.4 |        
   18554 | 2023-06-18 03:23:50 |             MASTER- | (10h 31m 00.99s , +38d 52m 32.6s) |   C |   180 | 14.8 |        
   18754 | 2023-06-18 03:27:11 |             MASTER- | (10h 57m 37.91s , +42d 43m 58.0s) |   C |   180 | 17.9 |        
   18954 | 2023-06-18 03:30:31 |             MASTER- | (11h 08m 28.59s , +42d 44m 08.5s) |   C |   180 | 17.9 |        
   19293 | 2023-06-18 03:36:10 |             MASTER- | (10h 20m 38.75s , +38d 52m 00.3s) |   C |   180 | 17.0 |        
   19635 | 2023-06-18 03:41:51 |             MASTER- | (10h 31m 05.15s , +38d 51m 42.0s) |   C |   180 | 15.5 |        
   19975 | 2023-06-18 03:47:32 |             MASTER- | (09h 38m 33.30s , +27d 21m 32.4s) |   C |   180 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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


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