TITLE:   GCN CIRCULAR
NUMBER:  31248
SUBJECT: IceCube Alert 211216.99: Global MASTER-Net observations report 
DATE:    21/12/17 00:13:06 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 211216.99 (trigger No 6147475,13h 18m 32.64s , +16d 54m 57.6s, R=0.51) errorbox  151 sec after notice time and 202 sec after trigger time at 2021-12-16 23:44:36 UT, with upper limit up to  16.3 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -52.0 deg. 

The galactic latitude b = 77 deg., longitude l = 338 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1816964

We obtain a following upper limits.  

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

     223 | 2021-12-16 23:44:36 |   MASTER-Kislovodsk | (13h 17m 51.05s , +17d 00m 52.2s) |  P- |    40 | 15.2 |        
    1127 | 2021-12-16 23:58:30 |   MASTER-Kislovodsk | (13h 17m 50.65s , +17d 01m 25.1s) |   C |   180 | 16.3 |        
    1127 | 2021-12-16 23:58:30 |   MASTER-Kislovodsk | (13h 17m 55.77s , +16d 38m 11.5s) |   C |   180 | 16.1 |        
    1528 | 2021-12-17 00:05:12 |   MASTER-Kislovodsk | (13h 17m 54.98s , +17d 01m 33.0s) |   C |   180 | 16.1 |        
    1528 | 2021-12-17 00:05:12 |   MASTER-Kislovodsk | (13h 18m 00.06s , +16d 38m 29.4s) |   C |   180 | 15.7 |        
Filter C is a clear (unfiltred) band. 


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