TITLE:   GCN CIRCULAR
NUMBER:  30344
SUBJECT: IceCube Alert 210629.76: Global MASTER-Net observations report 
DATE:    21/06/30 00:26:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
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, O.Ershova 
(Irkutsk State University, API),

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

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




MASTER-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) started inspect of the IceCube Alert 210629.76 (trigger No 3139778,22h 43m 00.00s , +12d 56m 24.0s, R=1.3) errorbox  21310 sec after notice time and 21360 sec after trigger time at 2021-06-30 00:05:44 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 72 deg. The sun  altitude  is -36.8 deg. 

The galactic latitude b = -39 deg., longitude l = 82 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1648119

We obtain a following upper limits.  

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

    8905 | 2021-06-29 20:37:39 |             MASTER- | (22h 42m 05.70s , +12d 47m 16.3s) |   C |    60 | 14.0 |        
   21450 | 2021-06-30 00:05:44 |          MASTER-IAC | (22h 40m 27.24s , +12d 30m 02.6s) |   C |   180 | 17.9 |        
   21450 | 2021-06-30 00:05:44 |          MASTER-IAC | (22h 41m 25.71s , +12d 23m 09.1s) |   C |   180 | 17.2 |        
   22064 | 2021-06-30 00:15:58 |          MASTER-IAC | (22h 40m 30.36s , +12d 30m 21.5s) |   C |   180 | 17.9 |        
   22064 | 2021-06-30 00:15:58 |          MASTER-IAC | (22h 41m 29.63s , +12d 23m 13.5s) |   C |   180 | 17.5 |        
Filter C is a clear (unfiltred) band. 


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