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GCN Circular 35668

Subject
Fermi GRB 240204A: Global MASTER-Net observations report
Date
2024-02-04T16:15:52Z (10 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240204A ( Fermi GBM team, GCN 35664Not found
 
 
) errorbox  818 sec after notice time and 854 sec after trigger time at 2024-02-04 15:21:52 UT, with upper limit up to  20.8 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -48.0 deg. 

The galactic latitude b = -2 deg., longitude l = 216 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2371241

We obtain a following upper limits.  

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

     884 | 2024-02-04 15:21:52 |        MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) |   C |    60 | 19.9 |        
     944 | 2024-02-04 15:21:52 |        MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) |   C |   180 | 20.4 |  Coadd 
    1154 | 2024-02-04 15:21:52 |        MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) |   C |   600 | 20.8 |  Coadd 
     947 | 2024-02-04 15:22:56 |        MASTER-Tunka | (06h 45m 43.78s , -03d 13m 01.1s) |   C |    60 | 19.9 |        
    1011 | 2024-02-04 15:23:59 |        MASTER-Tunka | (06h 45m 43.83s , -03d 12m 59.8s) |   C |    60 | 19.9 |        
    1074 | 2024-02-04 15:25:02 |        MASTER-Tunka | (06h 45m 43.88s , -03d 12m 57.8s) |   C |    60 | 19.9 |        
    1134 | 2024-02-04 15:25:02 |        MASTER-Tunka | (06h 45m 43.88s , -03d 12m 57.9s) |   C |   180 | 20.4 |  Coadd 
    1201 | 2024-02-04 15:27:09 |        MASTER-Tunka | (06h 45m 44.01s , -03d 12m 54.0s) |   C |    60 | 19.8 |        
    1264 | 2024-02-04 15:28:12 |        MASTER-Tunka | (06h 45m 44.05s , -03d 12m 52.5s) |   C |    60 | 19.9 |        
    1327 | 2024-02-04 15:29:15 |        MASTER-Tunka | (06h 45m 44.14s , -03d 12m 50.2s) |   C |    60 | 19.9 |        
    1387 | 2024-02-04 15:29:15 |        MASTER-Tunka | (06h 45m 44.14s , -03d 12m 50.2s) |   C |   180 | 20.4 |  Coadd 
    1454 | 2024-02-04 15:31:22 |        MASTER-Tunka | (06h 45m 44.31s , -03d 12m 46.5s) |   C |    60 | 19.8 |        
    1522 | 2024-02-04 15:32:30 |        MASTER-Tunka | (06h 45m 49.39s , -03d 12m 38.6s) |   C |    60 | 19.9 |        
    1585 | 2024-02-04 15:33:33 |        MASTER-Tunka | (06h 45m 49.44s , -03d 12m 36.0s) |   C |    60 | 20.0 |        
    1645 | 2024-02-04 15:33:33 |        MASTER-Tunka | (06h 45m 49.44s , -03d 12m 36.0s) |   C |   180 | 20.5 |  Coadd 
    1648 | 2024-02-04 15:34:37 |        MASTER-Tunka | (06h 45m 49.50s , -03d 12m 34.2s) |   C |    60 | 20.0 |        
    1712 | 2024-02-04 15:35:40 |        MASTER-Tunka | (06h 45m 49.57s , -03d 12m 32.2s) |   C |    60 | 20.0 |        
    1775 | 2024-02-04 15:36:43 |        MASTER-Tunka | (06h 45m 49.60s , -03d 12m 30.7s) |   C |    60 | 20.0 |        
    1835 | 2024-02-04 15:36:43 |        MASTER-Tunka | (06h 45m 49.61s , -03d 12m 30.8s) |   C |   180 | 20.5 |  Coadd 
    1838 | 2024-02-04 15:37:46 |        MASTER-Tunka | (06h 45m 49.68s , -03d 12m 29.1s) |   C |    60 | 20.1 |        
    1901 | 2024-02-04 15:38:50 |        MASTER-Tunka | (06h 45m 49.73s , -03d 12m 27.3s) |   C |    60 | 20.0 |        
    1965 | 2024-02-04 15:39:53 |        MASTER-Tunka | (06h 45m 49.77s , -03d 12m 25.3s) |   C |    60 | 20.0 |        
    2028 | 2024-02-04 15:40:56 |        MASTER-Tunka | (06h 45m 49.82s , -03d 12m 23.8s) |   C |    60 | 20.0 |        
    2091 | 2024-02-04 15:41:59 |        MASTER-Tunka | (06h 45m 49.86s , -03d 12m 21.8s) |   C |    60 | 20.0 |        
Filter C is a clear (unfiltred) band. 


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