TITLE:   GCN CIRCULAR
NUMBER:  32266
SUBJECT: IceCube Alert 220624.68: Global MASTER-Net observations report 
DATE:    22/06/24 22:13:22 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 220624.68 (trigger No 7637140,14h 57m 35.28s , +40d 41m 09.6s, R=0.51) errorbox  19838 sec after notice time and 19885 sec after trigger time at 2022-06-24 21:44:41 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -74.9 deg. 

The galactic latitude b = 60 deg., longitude l = 68 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2014640

We obtain a following upper limits.  

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

   19916 | 2022-06-24 21:44:41 |         MASTER-SAAO | (15h 01m 58.31s , +41d 13m 44.8s) |   C |    60 | 17.8 |        
   20096 | 2022-06-24 21:47:42 |         MASTER-SAAO | (14h 56m 44.38s , +39d 18m 34.8s) |   C |    60 | 18.2 |        
   20176 | 2022-06-24 21:49:02 |         MASTER-SAAO | (15h 06m 59.80s , +39d 19m 32.5s) |   C |    60 | 18.4 |        
   21116 | 2022-06-24 22:04:42 |         MASTER-SAAO | (15h 06m 59.64s , +39d 18m 14.8s) |   C |    60 | 17.6 |        
Filter C is a clear (unfiltred) band. 


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