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GCN Circular 33346

Subject
IceCube Alert 230217.87: Global MASTER-Net observations report
Date
2023-02-19T06:52:09Z (2 years ago)
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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the IceCube Alert 230217.87 (trigger No 22129736,08h 17m 40.32s , +18d 54m 54.0s, R=1.02) errorbox  77449 sec after notice time and 77512 sec after trigger time at 2023-02-18 18:21:35 UT, with upper limit up to  19.3 mag. Observations started at twilight.  The observations began at zenith distance = 64 deg. The sun  altitude  is -12.0 deg. 

The galactic latitude b = 28 deg., longitude l = 205 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2199826

We obtain a following upper limits.  

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

   77602 | 2023-02-18 18:21:35 |         MASTER-SAAO | (08h 17m 49.59s , +18d 54m 32.4s) |   C |   180 | 16.0 |        
   77602 | 2023-02-18 18:21:35 |         MASTER-SAAO | (08h 16m 55.92s , +18d 54m 29.9s) |   C |   180 | 16.3 |        
   77742 | 2023-02-18 18:24:55 |         MASTER-SAAO | (08h 12m 09.45s , +18d 17m 48.1s) |   C |    60 | 17.4 |        
   77742 | 2023-02-18 18:24:55 |         MASTER-SAAO | (08h 11m 15.74s , +18d 17m 44.3s) |   C |    60 | 17.5 |        
   77821 | 2023-02-18 18:26:14 |         MASTER-SAAO | (08h 20m 37.84s , +18d 17m 11.9s) |   C |    60 | 17.5 |        
   77821 | 2023-02-18 18:26:14 |         MASTER-SAAO | (08h 19m 44.12s , +18d 17m 07.9s) |   C |    60 | 17.4 |        
   77913 | 2023-02-18 18:27:46 |         MASTER-SAAO | (08h 17m 56.08s , +20d 11m 08.4s) |   C |    60 | 17.5 |        
   77913 | 2023-02-18 18:27:46 |         MASTER-SAAO | (08h 17m 01.71s , +20d 11m 03.7s) |   C |    60 | 17.6 |        
   78023 | 2023-02-18 18:29:36 |         MASTER-SAAO | (08h 24m 57.54s , +20d 06m 53.9s) |   C |    60 | 18.2 |        
   78023 | 2023-02-18 18:29:36 |         MASTER-SAAO | (08h 24m 02.88s , +20d 07m 20.1s) |   C |    60 | 18.2 |        
   78743 | 2023-02-18 18:40:36 |         MASTER-SAAO | (08h 16m 36.10s , +18d 53m 06.9s) |   C |   180 | 18.1 |        
   78743 | 2023-02-18 18:40:36 |         MASTER-SAAO | (08h 17m 30.27s , +18d 53m 07.8s) |   C |   180 | 18.4 |        
   78895 | 2023-02-18 18:44:08 |         MASTER-SAAO | (08h 11m 04.95s , +18d 16m 28.2s) |   C |    60 | 18.7 |        
   78895 | 2023-02-18 18:44:08 |         MASTER-SAAO | (08h 11m 59.13s , +18d 16m 30.9s) |   C |    60 | 18.8 |        
   78986 | 2023-02-18 18:45:39 |         MASTER-SAAO | (08h 20m 24.09s , +18d 18m 19.8s) |   C |    60 | 18.6 |        
   78986 | 2023-02-18 18:45:39 |         MASTER-SAAO | (08h 19m 29.90s , +18d 18m 16.9s) |   C |    60 | 18.5 |        
   79077 | 2023-02-18 18:47:10 |         MASTER-SAAO | (08h 16m 45.86s , +20d 10m 27.2s) |   C |    60 | 18.6 |        
   79077 | 2023-02-18 18:47:10 |         MASTER-SAAO | (08h 17m 40.64s , +20d 10m 30.9s) |   C |    60 | 18.9 |        
   79157 | 2023-02-18 18:48:30 |         MASTER-SAAO | (08h 25m 23.80s , +20d 12m 23.2s) |   C |    60 | 18.5 |        
   79157 | 2023-02-18 18:48:30 |         MASTER-SAAO | (08h 26m 18.56s , +20d 12m 26.9s) |   C |    60 | 18.6 |        
   80164 | 2023-02-18 19:04:17 |         MASTER-SAAO | (08h 16m 39.96s , +18d 53m 16.0s) |   C |   180 | 19.2 |        
   80164 | 2023-02-18 19:04:17 |         MASTER-SAAO | (08h 17m 34.60s , +18d 53m 13.5s) |   C |   180 | 19.3 |        
   80315 | 2023-02-18 19:07:48 |         MASTER-SAAO | (08h 11m 57.88s , +18d 18m 14.6s) |   C |    60 | 19.0 |        
   80315 | 2023-02-18 19:07:48 |         MASTER-SAAO | (08h 11m 03.32s , +18d 18m 15.8s) |   C |    60 | 18.8 |        
   80395 | 2023-02-18 19:09:08 |         MASTER-SAAO | (08h 19m 28.58s , +18d 16m 48.3s) |   C |    60 | 18.8 |        
   80395 | 2023-02-18 19:09:08 |         MASTER-SAAO | (08h 20m 23.11s , +18d 16m 47.1s) |   C |    60 | 19.1 |        
   80486 | 2023-02-18 19:10:39 |         MASTER-SAAO | (08h 17m 45.92s , +20d 12m 19.7s) |   C |    60 | 19.0 |        
   80486 | 2023-02-18 19:10:39 |         MASTER-SAAO | (08h 16m 50.80s , +20d 12m 19.9s) |   C |    60 | 18.7 |        
   80566 | 2023-02-18 19:11:59 |         MASTER-SAAO | (08h 25m 15.39s , +20d 11m 36.3s) |   C |    60 | 18.8 |        
   80566 | 2023-02-18 19:11:59 |         MASTER-SAAO | (08h 26m 10.50s , +20d 11m 36.1s) |   C |    60 | 19.0 |        
Filter C is a clear (unfiltred) band. 


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