TITLE:   GCN CIRCULAR
NUMBER:  33098
SUBJECT: IceCube Alert 221224.04: Global MASTER-Net observations report 
DATE:    22/12/24 19:39:09 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, 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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the IceCube Alert 221224.04 (trigger No 77414913,22h 23m 22.32s , +01d 23m 45.6s, R=0.51) errorbox  65572 sec after notice time and 65627 sec after trigger time at 2022-12-24 19:08:56 UT, with upper limit up to  15.2 mag. Observations started at twilight.  The observations began at zenith distance = 70 deg. The sun  altitude  is -15.4 deg. 

The galactic latitude b = -45 deg., longitude l = 66 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2186854

We obtain a following upper limits.  

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

   65717 | 2022-12-24 19:08:56 |         MASTER-SAAO | (22h 22m 46.59s , +01d 25m 49.9s) |   C |   180 | 15.2 |        
   66100 | 2022-12-24 19:15:19 |         MASTER-SAAO | (22h 22m 49.84s , +01d 26m 03.2s) |   C |   180 | 13.9 |        
   66512 | 2022-12-24 19:22:10 |         MASTER-SAAO | (22h 22m 56.22s , +01d 24m 18.8s) |   C |   180 | 14.5 |        
   66723 | 2022-12-24 19:25:42 |         MASTER-SAAO | (22h 23m 03.52s , +01d 24m 39.1s) |   C |   180 | 12.8 |        
Filter C is a clear (unfiltred) band. 


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