GCN Circular 34905

V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo/KAGRA S231029ai errorbox  20 sec after notice time and 120 sec after trigger time at 2023-10-29 14:53:39 UT, with upper limit up to  13.0 mag. The observations began at zenith distance = 61 deg. The sun  altitude  is -53.1 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the LIGO/Virgo/KAGRA S231029ai errorbox  30 sec after notice time and 130 sec after trigger time at 2023-10-29 14:53:49 UT, with upper limit up to  15.2 mag. The observations began at zenith distance = 76 deg. The sun  altitude  is -45.6 deg. 

The galactic latitude b = -28 deg., longitude l = 196 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=17154

We obtain a following upper limits.  

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

     130 | 2023-10-29 14:53:39 |         MASTER-Amur | (04h 39m 32.65s , +00d 34m 08.8s) |   C |    20 | 13.0 |        
     135 | 2023-10-29 14:53:49 |        MASTER-Tunka | (04h 34m 14.22s , -02d 09m 26.4s) |   C |    10 | 14.9 |        
     163 | 2023-10-29 14:54:18 |        MASTER-Tunka | (04h 34m 14.19s , -02d 09m 25.5s) |   C |     5 | 14.9 |        
     175 | 2023-10-29 14:54:19 |         MASTER-Amur | (04h 39m 26.75s , +00d 33m 05.9s) |   C |    30 | 12.8 |        
     185 | 2023-10-29 14:54:43 |        MASTER-Tunka | (04h 34m 14.21s , -02d 09m 24.0s) |   C |     1 | 14.0 |        
     185 | 2023-10-29 14:54:43 |        MASTER-Tunka | (04h 27m 01.14s , -01d 59m 12.1s) |   C |     1 | 12.3 |        
     206 | 2023-10-29 14:55:03 |        MASTER-Tunka | (04h 27m 01.14s , -01d 59m 10.9s) |   C |     1 | 12.9 |        
     230 | 2023-10-29 14:55:08 |         MASTER-Amur | (04h 39m 31.72s , +00d 33m 19.2s) |   C |    40 | 12.8 |        
     226 | 2023-10-29 14:55:24 |        MASTER-Tunka | (04h 27m 01.14s , -01d 59m 10.2s) |   C |     1 | 13.4 |        
     246 | 2023-10-29 14:55:44 |        MASTER-Tunka | (04h 27m 01.12s , -01d 59m 10.2s) |   C |     1 | 13.3 |        
     268 | 2023-10-29 14:56:04 |        MASTER-Tunka | (04h 34m 14.20s , -02d 09m 22.1s) |   C |     5 | 15.2 |        
Filter C is a clear (unfiltred) band. 


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