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GCN Circular 37030

Subject
Fermi GRB 240804A: Global MASTER-Net observations report
Date
2024-08-04T21:45:40Z (a month 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-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) started inspect of the Fermi GRB 240804A ( Fermi GBM team, GCN 37028Not found
 
 
) errorbox  6897 sec after notice time and 6928 sec after trigger time at 2024-08-04 21:01:30 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -28.0 deg. 

The galactic latitude b = 31 deg., longitude l = 88 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2550987

We obtain a following upper limits.  

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

    6958 | 2024-08-04 21:01:30 |      MASTER-Tavrida | (17h 39m 17.27s , +59d 19m 52.2s) |   C |    60 | 18.8 |        
    7031 | 2024-08-04 21:02:43 |      MASTER-Tavrida | (17h 55m 03.48s , +59d 20m 47.9s) |   C |    60 | 18.8 |        
    7105 | 2024-08-04 21:03:57 |      MASTER-Tavrida | (17h 39m 16.68s , +60d 39m 25.4s) |   C |    60 | 18.8 |        
    7179 | 2024-08-04 21:05:11 |      MASTER-Tavrida | (17h 55m 45.65s , +60d 38m 06.5s) |   C |    60 | 18.6 |        
    7252 | 2024-08-04 21:06:24 |      MASTER-Tavrida | (17h 39m 49.96s , +58d 01m 30.8s) |   C |    60 | 18.6 |        
    7326 | 2024-08-04 21:07:38 |      MASTER-Tavrida | (17h 54m 55.38s , +58d 03m 00.5s) |   C |    60 | 18.7 |        
    8707 | 2024-08-04 21:30:39 |      MASTER-Tavrida | (17h 39m 17.26s , +59d 20m 03.8s) |   C |    60 | 17.6 |        
    8781 | 2024-08-04 21:31:52 |      MASTER-Tavrida | (17h 55m 06.57s , +59d 18m 47.5s) |   C |    60 | 18.0 |        
    8854 | 2024-08-04 21:33:06 |      MASTER-Tavrida | (17h 39m 18.91s , +60d 36m 09.1s) |   C |    60 | 17.9 |        
    8927 | 2024-08-04 21:34:19 |      MASTER-Tavrida | (17h 55m 47.90s , +60d 36m 21.2s) |   C |    60 | 17.3 |        
    9001 | 2024-08-04 21:35:33 |      MASTER-Tavrida | (17h 39m 48.79s , +58d 02m 10.2s) |   C |    60 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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