TITLE:   GCN CIRCULAR
NUMBER:  33250
SUBJECT: IceCube Alert 230201.26: Global MASTER-Net observations report 
DATE:    23/02/02 09:52:10 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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the IceCube Alert 230201.26 (trigger No 30799022,23h 04m 33.84s , +12d 02m 16.8s, R=0.51) errorbox  1 days 11538 sec after notice time and 1 days 11596 sec after trigger time at 2023-02-02 09:34:11 UT, with upper limit up to  16.5 mag. Observations started at twilight.  The observations began at zenith distance = 59 deg. The sun  altitude  is -11.3 deg. 

The galactic latitude b = -43 deg., longitude l = 87 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2195910

We obtain a following upper limits.  

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

   98027 | 2023-02-02 09:34:11 |         MASTER-Amur | (23h 02m 52.50s , +12d 41m 20.4s) |   C |    60 | 15.9 |        
   98106 | 2023-02-02 09:35:30 |         MASTER-Amur | (23h 10m 59.55s , +12d 40m 26.0s) |   C |    60 | 16.1 |        
   98489 | 2023-02-02 09:40:53 |         MASTER-Amur | (23h 05m 17.68s , +12d 05m 57.5s) |   C |   180 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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