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GCN Circular 34164

Subject
IceCube Alert 230707.71: Global MASTER-Net observations report
Date
2023-07-07T18:39:41Z (10 months 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-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 230707.71 (trigger No 11333473,17h 56m 07.20s , -01d 56m 24.0s, R=0.68) errorbox  5139 sec after notice time and 5201 sec after trigger time at 2023-07-07 18:25:31 UT, with upper limit up to  16.1 mag. Observations started at twilight.  The observations began at zenith distance = 54 deg. The sun  altitude  is -8.9 deg. 

The galactic latitude b = 11 deg., longitude l = 25 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2234920

We obtain a following upper limits.  

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

    5291 | 2023-07-07 18:25:31 |      MASTER-Tavrida | (17h 53m 25.13s , -01d 44m 34.7s) |   C |   180 | 13.7 |        
    5481 | 2023-07-07 18:28:41 |      MASTER-Tavrida | (17h 53m 22.65s , -01d 43m 08.7s) |   C |   180 | 15.8 |        
    5670 | 2023-07-07 18:31:50 |      MASTER-Tavrida | (17h 53m 22.73s , -01d 44m 48.1s) |   C |   180 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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


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