TITLE:   GCN CIRCULAR
NUMBER:  31112
SUBJECT: IceCube Alert 211123.60: Global MASTER-Net observations report 
DATE:    21/11/24 15:26:18 GMT
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, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov,  D. Cheryasov
(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),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

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


MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the IceCube Alert 211123.60 (trigger No 15193553,17h 40m 35.28s , +07d 02m 38.4s, R=1.01) errorbox  81707 sec after notice time and 1 days 2636 sec after trigger time at 2021-11-24 15:09:18 UT, with upper limit up to  17.3 mag. Observations started at twilight.  The observations began at zenith distance = 65 deg. The sun  altitude  is -10.7 deg. 

The galactic latitude b = 18 deg., longitude l = 31 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1794559

We obtain a following upper limits.  

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

   89066 | 2021-11-24 15:09:18 |      MASTER-Tavrida | (17h 45m 12.09s , +04d 43m 42.5s) |   C |    60 | 16.2 |        
   89303 | 2021-11-24 15:13:15 |      MASTER-Tavrida | (17h 38m 04.47s , +04d 44m 59.8s) |   C |    60 | 16.7 |        
   89540 | 2021-11-24 15:17:12 |      MASTER-Tavrida | (17h 33m 35.03s , +06d 37m 18.6s) |   C |    60 | 17.0 |        
   89619 | 2021-11-24 15:18:31 |      MASTER-Tavrida | (17h 41m 44.87s , +06d 37m 29.3s) |   C |    60 | 17.0 |        
   89699 | 2021-11-24 15:19:51 |      MASTER-Tavrida | (17h 38m 28.19s , +08d 33m 02.5s) |   C |    60 | 17.2 |        
   89777 | 2021-11-24 15:21:10 |      MASTER-Tavrida | (17h 46m 33.72s , +08d 31m 22.8s) |   C |    60 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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