GCN Circular 35895

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-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) started inspect of the IceCube Alert 240307.32 (trigger No 34742349,15h 55m 54.48s , +39d 36m 46.8s, R=2.84) errorbox  18588 sec after notice time and 18638 sec after trigger time at 2024-03-07 12:55:36 UT, with upper limit up to  18.6 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -33.2 deg. 

The galactic latitude b = 50 deg., longitude l = 63 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2393538

We obtain a following upper limits.  

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

   18669 | 2024-03-07 12:55:36 |         MASTER-Amur | (15h 41m 19.59s , +43d 07m 43.3s) |   C |    60 | 17.7 |        
   18828 | 2024-03-07 12:58:15 |         MASTER-Amur | (15h 33m 53.81s , +41d 14m 46.2s) |   C |    60 | 17.9 |        
   19671 | 2024-03-07 13:12:18 |         MASTER-Amur | (15h 41m 09.34s , +43d 09m 06.2s) |   C |    60 | 18.0 |        
   19912 | 2024-03-07 13:16:19 |         MASTER-Amur | (15h 33m 49.52s , +41d 13m 01.4s) |   C |    60 | 18.1 |        
   20874 | 2024-03-07 13:32:21 |         MASTER-Amur | (15h 41m 04.48s , +43d 07m 36.5s) |   C |    60 | 18.1 |        
   21033 | 2024-03-07 13:35:00 |         MASTER-Amur | (15h 33m 46.21s , +41d 13m 15.7s) |   C |    60 | 18.1 |        
   21253 | 2024-03-07 13:37:40 |         MASTER-Amur | (15h 56m 43.96s , +39d 43m 53.6s) |   C |   180 | 18.6 |        
   21392 | 2024-03-07 13:40:59 |         MASTER-Amur | (15h 56m 43.48s , +39d 19m 10.6s) |   C |    60 | 18.4 |        
   21472 | 2024-03-07 13:42:19 |         MASTER-Amur | (16h 07m 08.41s , +39d 20m 56.0s) |   C |    60 | 18.3 |        
   21552 | 2024-03-07 13:43:39 |         MASTER-Amur | (15h 43m 12.12s , +41d 14m 14.5s) |   C |    60 | 18.3 |        
   21632 | 2024-03-07 13:44:58 |         MASTER-Amur | (15h 53m 57.31s , +41d 13m 32.2s) |   C |    60 | 18.4 |        
Filter C is a clear (unfiltred) band. 


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