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GCN Circular 34002

Subject
LIGO/Virgo S230615ak: Global MASTER-Net observations report
Date
2023-06-18T09:28:41Z (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 S230615ak errorbox  2 days 63328 sec after notice time and 2 days 63395 sec after trigger time at 2023-06-18 07:01:58 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -56.7 deg. 

The galactic latitude b = 10 deg., longitude l = 31 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=12038

We obtain a following upper limits.  

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

  163630 | 2023-06-17 10:52:23 |             MASTER- | (18h 05m 49.44s , +45d 11m 01.8s) |   C |    20 | 17.9 |        
  163670 | 2023-06-17 10:53:03 |             MASTER- | (18h 05m 46.44s , +45d 12m 38.1s) |   C |    20 | 17.7 |        
  163715 | 2023-06-17 10:53:43 |             MASTER- | (18h 05m 46.90s , +45d 11m 05.5s) |   C |    30 | 16.4 |        
  163770 | 2023-06-17 10:54:32 |             MASTER- | (18h 05m 49.69s , +45d 12m 07.4s) |   C |    40 | 18.6 |        
  163835 | 2023-06-17 10:55:32 |             MASTER- | (18h 05m 44.00s , +45d 11m 24.5s) |   C |    50 | 18.7 |        
  163915 | 2023-06-17 10:56:42 |             MASTER- | (18h 05m 43.98s , +45d 12m 16.4s) |   C |    70 | 18.6 |        
  164015 | 2023-06-17 10:58:13 |             MASTER- | (18h 05m 49.76s , +45d 11m 09.7s) |   C |    90 | 18.0 |        
  164135 | 2023-06-17 11:00:02 |             MASTER- | (18h 05m 43.17s , +45d 09m 54.8s) |   C |   110 | 18.3 |        
  236286 | 2023-06-18 07:01:58 |         MASTER-OAFA | (17h 50m 54.68s , +09d 20m 18.5s) |   C |   180 | 18.5 |        
  236708 | 2023-06-18 07:09:00 |         MASTER-OAFA | (17h 59m 07.21s , +09d 20m 04.0s) |   C |   180 | 18.7 |        
  237130 | 2023-06-18 07:16:02 |         MASTER-OAFA | (17h 50m 59.97s , +09d 19m 17.5s) |   C |   180 | 18.6 |        
  237551 | 2023-06-18 07:23:04 |         MASTER-OAFA | (17h 59m 03.08s , +09d 18m 57.4s) |   C |   180 | 18.6 |        
  238141 | 2023-06-18 07:32:54 |         MASTER-OAFA | (17h 46m 00.23s , +07d 25m 15.1s) |   C |   180 | 18.4 |        
  238353 | 2023-06-18 07:36:25 |         MASTER-OAFA | (17h 54m 09.26s , +07d 25m 10.8s) |   C |   180 | 18.5 |        
  238564 | 2023-06-18 07:39:57 |         MASTER-OAFA | (17h 57m 05.16s , +11d 14m 27.7s) |   C |   180 | 18.7 |        
  238777 | 2023-06-18 07:43:29 |         MASTER-OAFA | (18h 05m 13.87s , +11d 12m 45.6s) |   C |   180 | 18.5 |        
  239247 | 2023-06-18 07:51:20 |         MASTER-OAFA | (17h 54m 01.64s , +07d 25m 54.2s) |   C |   180 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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


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