GCN Circular 34892

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 IceCube Alert 231027.18 (trigger No 60138479,17h 48m 38.40s , +46d 57m 36.0s, R=2.97) errorbox  34100 sec after notice time and 34152 sec after trigger time at 2023-10-27 13:45:22 UT, with upper limit up to  16.9 mag. The observations began at zenith distance = 61 deg. The sun  altitude  is -48.5 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the IceCube Alert 231027.18 errorbox  34123 sec after notice time and 34175 sec after trigger time at 2023-10-27 13:45:46 UT, with upper limit up to  13.7 mag. The observations began at zenith distance = 49 deg. The sun  altitude  is -36.6 deg. 

The galactic latitude b = 30 deg., longitude l = 74 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2291803

We obtain a following upper limits.  

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

   34242 | 2023-10-27 13:45:22 |         MASTER-Amur | (17h 56m 46.21s , +46d 55m 20.4s) |   C |   180 | 16.9 |        
   34206 | 2023-10-27 13:45:46 |        MASTER-Tunka | (17h 33m 51.97s , +49d 42m 23.2s) |   C |    60 | 13.7 |        
   34285 | 2023-10-27 13:47:05 |        MASTER-Tunka | (17h 33m 52.06s , +49d 42m 17.0s) |   C |    60 | 13.3 |        
   34442 | 2023-10-27 13:48:41 |         MASTER-Amur | (17h 56m 51.79s , +46d 55m 51.0s) |   C |   180 | 16.8 |        
   34641 | 2023-10-27 13:52:01 |         MASTER-Amur | (17h 56m 50.85s , +46d 57m 30.8s) |   C |   180 | 16.9 |        
   34841 | 2023-10-27 13:55:20 |         MASTER-Amur | (17h 56m 51.14s , +46d 56m 05.0s) |   C |   180 | 16.8 |        
   36240 | 2023-10-27 14:18:40 |         MASTER-Amur | (17h 44m 13.59s , +46d 31m 50.0s) |   C |   180 | 16.5 |        
   36439 | 2023-10-27 14:21:59 |         MASTER-Amur | (17h 44m 18.37s , +46d 33m 34.4s) |   C |   180 | 16.4 |        
   36645 | 2023-10-27 14:25:24 |         MASTER-Amur | (17h 44m 26.88s , +48d 32m 56.3s) |   C |   180 | 16.7 |        
   36844 | 2023-10-27 14:28:44 |         MASTER-Amur | (17h 44m 28.62s , +48d 34m 05.6s) |   C |   180 | 16.6 |        
   37044 | 2023-10-27 14:32:04 |         MASTER-Amur | (17h 44m 05.87s , +44d 33m 23.5s) |   C |   180 | 16.3 |        
   37244 | 2023-10-27 14:35:24 |         MASTER-Amur | (17h 43m 59.33s , +44d 32m 33.2s) |   C |   180 | 16.3 |        
   37843 | 2023-10-27 14:45:23 |         MASTER-Amur | (18h 14m 12.75s , +46d 31m 39.1s) |   C |   180 | 16.7 |        
   38043 | 2023-10-27 14:48:43 |         MASTER-Amur | (18h 14m 15.72s , +46d 33m 37.0s) |   C |   180 | 16.6 |        
   38243 | 2023-10-27 14:52:03 |         MASTER-Amur | (18h 14m 26.07s , +48d 32m 46.4s) |   C |   180 | 16.5 |        
   38443 | 2023-10-27 14:55:23 |         MASTER-Amur | (18h 14m 27.02s , +48d 33m 56.7s) |   C |   180 | 16.5 |        
   38642 | 2023-10-27 14:58:42 |         MASTER-Amur | (18h 07m 47.23s , +44d 02m 54.7s) |   C |   180 | 16.6 |        
   38842 | 2023-10-27 15:02:02 |         MASTER-Amur | (18h 07m 41.48s , +44d 02m 05.2s) |   C |   180 | 16.6 |        
   39045 | 2023-10-27 15:05:25 |         MASTER-Amur | (18h 07m 48.04s , +44d 02m 18.4s) |   C |   180 | 16.6 |        
Filter C is a clear (unfiltred) band. 


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