TITLE:   GCN CIRCULAR
NUMBER:  31456
SUBJECT: IceCube Alert 220115.51: Global MASTER-Net observations report 
DATE:    22/01/15 20:13:07 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),

B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)

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

A. Gabovich, V.Yurkov 
(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) was pointed to the IceCube Alert 220115.51 (trigger No 48281000,23h 49m 18.48s , +25d 07m 30.0s, R=0.51) errorbox  27563 sec after notice time and 27617 sec after trigger time at 2022-01-15 19:51:57 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 36 deg. The sun  altitude  is -18.1 deg. 

The galactic latitude b = -36 deg., longitude l = 106 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1850329

We obtain a following upper limits.  

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

   27708 | 2022-01-15 19:51:57 |          MASTER-IAC | (23h 46m 50.96s , +25d 01m 44.8s) |   C |   180 | 18.4 |        
   27708 | 2022-01-15 19:51:57 |          MASTER-IAC | (23h 47m 49.28s , +24d 56m 54.7s) |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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