GCN Circular 35985

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-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) started inspect of the IceCube Alert 240327.68 (trigger No 9784024,05h 56m 50.40s , +00d 55m 48.0s, R=1.4) errorbox  10823 sec after notice time and 10876 sec after trigger time at 2024-03-27 19:13:47 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -36.5 deg. 

The galactic latitude b = -11 deg., longitude l = 206 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2408710

We obtain a following upper limits.  

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

   10967 | 2024-03-27 19:13:47 |   MASTER-Kislovodsk | (05h 57m 23.69s , +00d 55m 43.0s) |   C |   180 | 17.9 |        
   10967 | 2024-03-27 19:13:47 |   MASTER-Kislovodsk | (05h 53m 38.29s , +01d 16m 16.5s) |   C |   180 | 18.2 |        
   11107 | 2024-03-27 19:17:07 |   MASTER-Kislovodsk | (05h 50m 05.31s , +01d 11m 04.6s) |   C |    60 | 17.3 |        
   11107 | 2024-03-27 19:17:07 |   MASTER-Kislovodsk | (05h 46m 20.62s , +01d 31m 36.6s) |   C |    60 | 17.4 |        
   11188 | 2024-03-27 19:18:28 |   MASTER-Kislovodsk | (06h 05m 19.39s , +01d 12m 31.8s) |   C |    60 | 17.1 |        
   11188 | 2024-03-27 19:18:28 |   MASTER-Kislovodsk | (06h 01m 33.66s , +01d 33m 08.1s) |   C |    60 | 17.6 |        
   11268 | 2024-03-27 19:19:48 |   MASTER-Kislovodsk | (05h 50m 09.68s , -00d 43m 00.2s) |   C |    60 | 17.2 |        
   11268 | 2024-03-27 19:19:48 |   MASTER-Kislovodsk | (05h 46m 26.07s , -00d 22m 31.8s) |   C |    60 | 17.5 |        
   11348 | 2024-03-27 19:21:08 |   MASTER-Kislovodsk | (06h 05m 15.84s , -00d 43m 33.2s) |   C |    60 | 17.2 |        
   11348 | 2024-03-27 19:21:08 |   MASTER-Kislovodsk | (06h 01m 31.22s , -00d 22m 59.0s) |   C |    60 | 17.6 |        
   11428 | 2024-03-27 19:22:28 |   MASTER-Kislovodsk | (05h 50m 36.45s , +03d 04m 24.3s) |   C |    60 | 17.1 |        
Filter C is a clear (unfiltred) band. 


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