TITLE:   GCN CIRCULAR
NUMBER:  34699
SUBJECT: IceCube Alert 230914.22: Global MASTER-Net observations report
DATE:    23/09/15 02:26:32 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, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),

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

MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 230914.22 (trigger No 45413430,10h 56m 00.00s , +32d 30m 50.4s, R=0.73) errorbox  73499 sec after notice time and 73545 sec after trigger time at 2023-09-15 01:46:49 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -17.2 deg. 

The galactic latitude b = 65 deg., longitude l = 194 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2270087

We obtain a following upper limits.  

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

   73576 | 2023-09-15 01:46:49 |      MASTER-Tavrida | (10h 48m 20.57s , +33d 45m 02.7s) |   C |    60 | 17.3 |        
   74318 | 2023-09-15 01:59:12 |      MASTER-Tavrida | (10h 48m 15.89s , +33d 46m 44.7s) |   C |    60 | 17.1 |        
   74391 | 2023-09-15 02:00:25 |      MASTER-Tavrida | (10h 57m 57.82s , +33d 45m 41.3s) |   C |    60 | 17.0 |        
   74471 | 2023-09-15 02:01:44 |      MASTER-Tavrida | (10h 52m 36.02s , +31d 51m 00.8s) |   C |    60 | 17.0 |        
   75212 | 2023-09-15 02:14:05 |      MASTER-Tavrida | (10h 57m 54.48s , +33d 45m 03.3s) |   C |    60 | 16.4 |        
   75285 | 2023-09-15 02:15:18 |      MASTER-Tavrida | (10h 52m 36.00s , +31d 52m 35.6s) |   C |    60 | 16.3 |        
   75356 | 2023-09-15 02:16:29 |      MASTER-Tavrida | (11h 01m 54.14s , +31d 52m 00.9s) |   C |    60 | 16.2 |        
   75429 | 2023-09-15 02:17:42 |      MASTER-Tavrida | (10h 57m 23.61s , +29d 58m 08.3s) |   C |    60 | 15.7 |        
Filter C is a clear (unfiltred) band. 


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